PDP-8 Stuff

./20ma-connections: Diagram of the 20ma connections in 8i, 8L.

20ma: is a schematic of the various parts and their connections.
4915: is a board similar to DEC's 4915.

./20ma-rs232: Board for TTY adapter box

loop-rs232: is a board to convert current loop to RS-232. It probably won't drive a TTY, though, as the loops are too low voltage.

./32k-8i: PDP-8/i Core replacement.

sboardnew: is an SRAM core replacement that uses simple paddle cards to hook into a PDP-8/i or PDP-12.

./32k-Omnibus: Omnibus 32K SRAM board

msc3102: is a drawing of the MSC3102 design.
Omnimem: is a simplified version using 74244 instead of 74125.

./BusCon: Bus Connector paddles for Negibus and Posibus

8j-merge: is a merge of the 34-pin and 40-pin paddles.
8j-merge2: is a merge of the 34-pin and 40-pin paddles, with various extras to make various cable ends.
BusConOld: is an early version based on the work of Charles Morris.
BusCon40: is an early incompatible version with better ground planes than BusConOld.
PosiBus: is a wacky idea with a molex connector.
BusCon: uses two 34-wire cables to carry Posibus, or just one for Negibus.
BusCon10: is BusCon again.
BusCon15: is BusCon again.
BusConPoly: is BusCon with Polygon fill.
tester: is another attempt at a backplane probe.
x-talk: is an attempt at a crosstalk measurement jig for Posibus cables.
BC08J: is essentially a BC08J paddle with a cheaper ribbon connector.
merge4: is four 8j-merge paddles on a single board.
proto: is four 8j-merge paddles simply panelized.

./chipfudge: Replacements for obsolete chips

AM27S13: is my board that uses a 27256 to replace the AM27S13 (but has trouble meeting the speed specifications).

./ConsoleEmu: Project with Henk Gooijen.

core+io1: is an early draft of a 6802 CPU core and some I/O latches (to drive lights from SIMH).
core+io2: is an early draft of the 6802+I/O board.
core+io3: is the 6802 board again, experimenting with form-factor and component placement.
core+io4: the bigger 6802 version again, with bypass caps added.
core1: splitting the 6802 board up -- this is the CPU core.
io1: splitting the 6802 board up -- this is the I/O stuff.
core+io5: another version of the combined core+io 6802 board.
core2: a newer version of core1.
io2: a newer version of io1.
core+io: is the last version of core+io.
io-ok: is a snapshot of the I/O board before io3.
io3: everything rearranged to get another pair of LS373 in.
core3: is a version of the core board that matches io3.
io-ol: is io3 with the Olimex scripts run to beef up the silkscreen.
core4: is another revision of the 6802 CPU core.
core5: is another revision of the 6802 CPU core.
core6: is another revision of the 6802 CPU core.
core-ol: is the core board with the Olimex silkscreen scripts run.
core: is the last version of the 6802 core board.
quadrature: is a simple quadrature clock.
adaptor: is a simple adaptor board to put a 6809 in an 6802 socket.
core09ss: is an early version of the 6809 core board, with the 6809 replacing the 6802 (essentially building in the adapter board).
09-09e: is an adapter board for using the 6809E in a 6809 socket.
core09: is an early 6809E based CPU core.
core09e2: is a later version of the 6809E core.
core09e3: is a later version of the 6809E core, with Olimex silkscreen scripts run.
io-ol2: is a version of the IO board to match the 6809E core, and with Olimex scripts run.
core-ol2: is the 6809E core, with Olimex scripts run.
corex: is a slightly different version of the 6809E core.
core09e: is the latest version of the 6809E CPU core.
corex2: is the latest version of the 6809E CPU core.
iognd: is the IO board, with a ground plane added on both sides.
core09gnd: is the 6809E core board, with a ground plane added on both sides.
io: is the latest version of the IO board.
iotester: is a slight modification of the IO board, folding in the hooks for the tester board.

./ConsoleEmu/FlipChip: FlipChip Test Jig based on core and i/o boards.

flipchip: is a design for a flipchip tester based on the core and IO boards.
proto: explores some ideas output interfacing to Rxxx modules.

./ConsoleEmuFDC: Floppy Controller for ConsoleEmu Project

core09gnd: is a copy of the 6809E CPU core, used as a starting point to get the board dimensions and connectors in the right place.
fdc: is my Eagle drawing of Henk's floppy disk controller prototype.

./DEC: Various stuff pertaining to DEC gear.

./DEC/8aPanel: PDP-8a Programmer's Panel

8235.sch: is a schematic for an approximation of the function of the unobtainium 8235 chip.
8235sub.sch: is a schematic for an approximation of the function of the unobtainium 8235 chip.
8235sub1.sch: is a schematic for an approximation of the function of the unobtainium 8235 chip.
8235sub2.sch: is a schematic for an approximation of the function of the unobtainium 8235 chip.
programmerconsole.sch: is a schematic (before board layout) of an early draft of board1.
programmerconsolebrd2.sch: is a schematic (before board layout) of an early draft of board1.
try1: is an early draft (05/26/2005) of board1 (the front-side board).
try2: is an early draft (05/27/2005) of board2 (the back-side board).
cut: is the stuff cut from board 1 and pasted to start board2, to ensure size and alignment match up. oboard2 is a checkpoint of an old version (06/02/2005) of board2.
Progpanl.fpd: is a Front Panel Express drawing of the Programmer's Panel artwork.
nosilkboth.brd: is both boards panelized, which is how the prototypes were ordered. This version has not had the silkscreen scripts run.
both.brd: is both boards panelized, which is how the prototypes were ordered. This version has had the silkscreen scripts run.
board1-0: is a snapshot of revision 0 of board1.
board2-0: is a snapshot of revision 0 of board2.
board1corrected: is board1 with the corrections to make DEC's schematics work.
board2corrected: is board2 with the corrections to make DEC's schematics work. (Has a consistency problem.)
board2eco: is board2 with the ECO's applied to make it work. (Has a consistency problem which highlights the ECOs.)
board1: is the latest drawing of board 1 (front) of the 8/A front panel replacement.
board2: is the latest drawing of board 2 (back) of the 8/A front panel replacement.

./DEC/A601: 3 Bit DAC

A601hand: is a partially hand routed A601 DAC replacement as a single-sided board.
A601: is another version of the A601 DAC replacement.
A601new: is the latest version of the A601 DAC replacement.

./DEC/BM812i: Omnibus Memory adapter for PDP-8/i and PDP-12

proto: is a version od the bm812i board scaled down to a few sockets, to make ordering a prototype cheaper.
bm812i: is a version of DEC's BM812i with extra space between the connector blocks.
singleboard: is an implementation designed to fit into a single slot in a standard Omnibus backplane.
sboardnew: is a newer version of singleboard, using 74S240 instead of 74H40 to drive the bus.
bm812inl: is a version of the BM812i board without the extra space around the connector blocks. (It needs to be checked against the chassis to see if it has the needed clearances.)

./DEC/DM01: Data Break Multiplexor

DM04r: is an aborted attempt to think about doing a DMA multiplexer from scratch.
DM01: is DEC's DM01, done up as a board in Eagle.
DM01eco: is DEC's DM01, with a TechTip fix added.
DM04mux: is another aborted early DM04 attempt.
DM04ttl: is my design for a DMA multiplexer similar to the DM04, based on DEC's DM01.

./DEC/DW08A: Posibus to Negibus Converter

dw08a2s: is a two-sided board based on DEC's DW08A Posibus Converter backplane.
dw08aholes: is a version of dw08a2s with un-needed cutout holes, and only 6 mil traces (too thin).
dw08a: is dw08aholes with the power traces beefed up, and is the version that matches the prototypes. It has a mechanical interference fit at the right edge.
dw08aRev2: is a version of the dw08a backplane with the interference fit fixed, and the un-needed holes removed.
dw08a4lyr: is a four layer version, with all the traces beefed up.

./DEC/DW08Bx: Negibus to Posibus Converter

dw08a: is a version of the DW08A Posibus to Negibus Converter backplane, for reference.
dw08b: is a drawing that approximates DEC's DW08B Negibus to Posibus Converter backplane. It is still an "x" version because the part/pin numbering has not been checked against the DEC version.

./DEC/Gxxx: Gxxx modules

./DEC/Gxxx/G021: G021 Sense Amplifier

G021old: is a drawing of DEC's G021 Core Sense Amplifier board, with the unobtainium MC1540 sense amp chips.
G021dec: is a drawing of DEC's G021 Core Sense Amplifier board, with the unobtainium MC1540 sense amp chips.
G021vrs: is a drawing of DEC's G021 Core Sense Amplifier board, with the unobtainium MC1540 sense amp chips.
sense-amp: is an approximation of the function of the MC1540, using LM148 op-amps.
G021-1: is a 12/04/2004 checkpoint of G021.
G021: is a version of the G021 with the MC1540 replaced with LM837.

./DEC/Gxxx/G228: Core Inhibit Driver

G228: is a drawing of DEC's G228 Inhibit Driver, including the unobtainium T-2052 transformers.

./DEC/Gxxx/G717: Positive Bus Control Signal Terminator.

G717: is an implementation of DEC's G717 bus terminator.

./DEC/Gxxx/G879: Transport Detector

G879: is an Eagle version of DEC's G879 Transport Detector.

./DEC/Gxxx/G888: Manchester Reader/Writer

G888: is an early attempt to draw the G888.
G888a: is an Eagle version of DEC's G888 with DIP versions of the MC1709.
G888b: an updated version of G888a.
G888c: an older version of G888a.
G888x: The latest verion of the G888, with a bunch of cross-reference information in the schematic.

./DEC/M11x: Replacement for M11[13579] modules.

MxxxRow: is a drawing for TTL versions of the M11[13579], all on one board. (Populate only the row for the desired module type.)
MxxxCol: is similar to MxxxRow, but arranges the chips in columns (less successful).
Mxxx: is a module that implements the M11[13579] in TTL (a newer version of MxxxRow).
mxxx.pl: is some Perl code to look at input-output mapping for PAL implementations.
PALFromPerl: is a PAL-based version based on the results from mxxx.pl.
PALVersion: is another PAL-based version similar to PalFromPerl.
PAL3579: is a PAL version that fits everything except the M111.
PAL13579: is a PAL version that fits everything, but needs a fourth PAL.
MxxxOVR: is the latest through-hole TTL version.
MxxxSMT: is an SMT verstion, which adds the M206/M216 and M207.
MxxxSMT8x11: is an 7.7"x10.1" panelization of six MxxxSMT.

./DEC/Mxxx: Mxxx modules

./DEC/Mxxx/M101: Bus Data Interface

M101: is an Eagle version of DEC's M101 Bus Interface.

./DEC/Mxxx/M103: Device Selector

M103: is an Eagle version of DEC's M103 Device Selector.

./DEC/Mxxx/M105: Address Selector

M105-bad: is an Eagle version of DEC's M105 Address Selector, but without bus receivers that won't actually work.
M105: is an Eagle version of DEC's M105 Address Selector with proper bus receivers.

./DEC/Mxxx/M111: Inverters

M111: is an Eagle version of DEC's M111 Inverter card.

./DEC/Mxxx/M113: 10 2-Input NAND Gates

M113: is an Eagle version of DEC's M113 NAND Gates

./DEC/Mxxx/M115: 8 3-Input NAND Gates

M115: is an Eagle version of DEC's M119 NAND Gates

./DEC/Mxxx/M117: 6 4-Input NAND Gates

M117: is an Eagle version of DEC's M117 4-Input NAND Gate Module

./DEC/Mxxx/M119: 3 8-Input NAND Gates

M119: is an Eagle version of DEC's M119 8-Input NAND Gate module.

./DEC/Mxxx/M121: AND-NOR Gate

M121: is an Eagle version of DEC's M121 AND-NOR Gate module.

./DEC/Mxxx/M161: Binary to Octal/Decimal Decoder

M161: is an Eagle version of DEC's M161 Octal/Decimal Decoder module.

./DEC/Mxxx/M162: Parity Circuit

M162: is an Eagle version of DEC's M162 Parity module.

./DEC/Mxxx/M206,M216: 6 D Flip-Flops

M206: is an Eagle version of DEC's M206 or M216 D Flip-Flop module.

./DEC/Mxxx/M207: 6 J-K Flip-Flops

M207: is an Eagle version of DEC's M207 J-K Flip-Flop module.

./DEC/Mxxx/M220b: Major Registers

m220print: is a snapshot of M220.
m220: is DEC's M220 Major Registers card (revision B).
m220noadder: is an incomplete attempt to replace the adder chip with gate-level logic.
m220new: is an implementation that doesn't use the hard to find 7453 and 7482 chips.
m220pal: is a PAL implementation, using PALs programed with m220pgm1.pds and m220pgm2.pds.

./DEC/Mxxx/M228: Mark Track Decoder

M228: is DEC's M228 Mark Track Decoder
M228pnames: is a version where the pin names are used instead of signal names.

./DEC/Mxxx/M302: One Shot Delay

M302: is an Eagle version of DEC's M302 One Shot Delay Board.

./DEC/Mxxx/M307: Integrating One Shot

M307-9601: is DEC's M307 Integrating One Shot module, with the now hard to find 9601 monostables.
M307foo: is a messed up version.
M307mod: is a checkpoint of an early version of M307.
M307: is a version of the M307 using the more readily available 74123 instead of the 9601.

./DEC/Mxxx/M360: Variable Delay

M360: is a replacement for DEC's M360 Variable Delay, based in part on the MM360, by Dave Brockman.

./DEC/Mxxx/M401: Variable Clock

M401: is an Eagle version of DEC's M401 Variable Clock module.

./DEC/Mxxx/M502: Negative Input Converter

M502-3: is a checkpoint of an early version.
M502: is DEC's M502 Negative Input Converter.

./DEC/Mxxx/M516: Hex Positive Bus Receiver

M516: is DEC's M516 Hex Positive Bus Receiver module.

./DEC/Mxxx/M602: Pulse Amplifier

M602: is DEC's M602 Pulse Amplifier module.
M602a: is essentially the same as M602.

./DEC/Mxxx/M623: Bus Driver

M623: is DEC's M623 Bus Driver module.

./DEC/Mxxx/M627: Power Amplifier Module

M627: is DEC's M627 Power Amplifier module.

./DEC/Mxxx/M633: Negative Bus Driver

M633: is DEC's M633 Negative Bus Driver.

./DEC/Mxxx/M705: PR8i Reader Logic

M705: is DEC's M705 PR8i Reader Logic board.
M705ok: is a checkpoint of M705.

./DEC/Mxxx/M710: PP8i Punch controller

M710-9601: is a drawing of DEC's M710 Punch Controller card, which uses the hard to find 9601 monstable.
M710: is a drawing of DEC's M710 Punch Controller card, which uses the hard to find 9601 monstable.

./DEC/Mxxx/M7102: Positive I/O Bus Converter

m7102: is a drawing of DEC's M7102 Positive I/O Bus Converter Board.

./DEC/Mxxx/M7103: Negative I/O Bus Converter

m7103: is a drawing of DEC's M7103 Negative I/O Bus Converter Board.

./DEC/Mxxx/M715: PR8i Reader Clock

M715: is a drawing of DEC's M715 Reader Clock module, with the hard to find 9601 monostables.

./DEC/Mxxx/M720: Memory Detection

M720: is DEC's M720 Memory Detection board.
M720db: is a version using monostables, based on the MM720 by Dave Brockman.

./DEC/Mxxx/M7672: TU10 Command Buffers

M7672: is a drawing of DEC's M7672 TU10 Command Buffers board, including the hard to find 8202 chip.
M7672n: is a drawing of DEC's M7672 TU10 Command Buffers board with the 8202 replaced with a 74821 chip.

./DEC/Mxxx/M7821: Interrupt Control

M7821: is a drawing of DEC's M7821 Interrupt Control board.

./DEC/Mxxx/M783: Unibus/Omnibus Drivers

M783bad: is a version of the M783 that won't work.
M783: is basically DEC's version of the M783 Bus Drivers module, using the now hard to find DS8881.
M783new: is a version of DEC's M783 Bus Drivers module using the AM26S10 instead of the DS8881.

./DEC/Mxxx/M784: Unibus/Omnibus Receivers

M784bad: is a version of the M784 that won't work.
M784: is basically DEC's version of the M784 Bus Receivers module, using the now hard to find SP380.
M784new: is a version of DEC's M784 Bus Receivers module using the AM26S10 instead of the SP380.

./DEC/Mxxx/M785: Unibus/Omnibus Tranceiver

M785dec: is an Eagle drawing of DEC's M785 Unibus/Omnibus Tranceiver board using the hard to find DS8881 and SP380 chips..
M785: is a version of DEC's M785 Unibus/Omnibus Tranceiver board with the hard to find chips replaced with AM26S10.
M785-3116: is a version of DEC's M785 Unibus/Omnibus Tranceiver board with the hard to find chips replaced with 7438 and the (too) expensive TL3116.

./DEC/Mxxx/M837: Omnibus Timeshare Option

M837bb: is a 06/15/2007 checkpoint of M837. M837 is a drawing of DEC's M837 Omnibus Timeshare Option board, which uses a lot of hard to find chips.

./DEC/Mxxx/M847: MI8E Diode Bootstrap Loader

fig4-9: is an early checkpoint of an attempt to draw the boot loader card.
M847: is a drawing of DEC's M847 Diode bootstrap loader.

./DEC/Mxxx/M850: DEC M850 TTY Connector

M850A: is a drawing of DEC's M850A EIA Connector card.
M850x: is a design for a version of the M850 EIA Connector card with input flow control implemented.

./DEC/Mxxx/M868: TD8E Simple Dectape Controller

M868: is an Eagle version of DEC's M868 Simple Dectape Controller.

./DEC/Mxxx/M891: TU10 CRC and Write Gating

M891: is a version of DEC's M891 CRC and Write Gating module.

./DEC/Mxxx/M896: TU10 CRC Checker

M896: is a drawing of DEC's M896 CRC Checker module, using the hard to find 8202.
M896n: is a version of the M896 CRC Checker with the 8202 replaced with the more common 74174.

./DEC/Mxxx/M90x,W0x1: Negibus/Posibus Connectors

BusCon: is a version of DEC's M90x and W0x1 connector paddles, (based on the work from the BusCon project).

./DEC/Mxxx/M916: 36 Pin connector

M916: is a version of DEC's M916 36 pin paddle connector.

./DEC/Mxxx/M930: RK05/Unibus Terminator

M930: is a version of DEC's M930 RK05/Unibus Terminator card using discrete resistors.
M930c: is a version of DEC's M930C RK05/Unibus Terminator card, which uses DIP resistor packs.

./DEC/Mxxx/M960: TD8E Connector #1

M960: is a version of DEC's M960 TD8E Connector board.
M960old: is a checkpoint of an incomplete version of DEC's M960 TD8E Connector board.

./DEC/Mxxx/M961: TD8E Connector #2

M961: is a version of DEC's M961 TD8E Connector board.
intercon: is just the interconnection of the ribbon cables.
M961old: is an early incomplete version of M961.

./DEC/Mxxx/M993: RK8E Control Cable Connector

M993: is a version of DEC's M993 RK8E Control Cable Connector, with the select DEC7384 replaced with a more readily available gate.

./DEC/PDP8L: PDP-8/L

pdp8l: is a drawing of DEC's PDP-8/L computer backplane, with some NC pins grounded to suppress warnings, and the hand-wired +5 distribution connections omitted.

./DEC/PDP8S: PDP-8/S

Memory-4K.sch: is a schematic by John Price of a proposed core replacement for the 8/S.
memory-32kx13.sch: is another schematic by John Price of a proposed core replacement for the 8/S.
ramboard: is my drawing for a battery backed SRAM for the 8/S. This one uses an open collector bus to reduce the number of drivers.
mtiming: is a schematic with my notes on memory timing in the 8/S.
PDP8S: is a snapshot of the 8/S schematics (just the first page).
pre-io: is another snapshot of the 8/S schematics (9 pages done).
memory: is a complete schematic for the 8/S, with the core memory subsystem replaced with level converters and a ramboard.

./DEC/RL0x: RL01/RL02 Related stuff.

./DEC/RL0x/terminator: RL0x Termininator boards.

terminator-sil: is a terminator implemented with SIL resistors.
terminator: is a terminator implemented with discrete SMT (0805) resistors.

./DEC/RX8E: M8357 RX8E Floppy Interface

RX8E: is a drawing of DEC's M8357 RX8E Floppy Interface board.

./DEC/TC08: TC08 Backplane

tc083-18: is a 3-18-2004 checkpoint of TC08 drawing in progress.
indicators: is an LED version of the TC08 Indicator panel.
so-indicators: is a surface mount version of the indicators board.
so-indicators-ok: is a backup of so-indicators.
tc08ss: is an experiment with routing one layer at a time.
tc08nh: is a successful routing without screw holes. (It also lacks an NC layer.)
tc08ttl: is an aborted attempt to convert to a "big board" TTL implementation.
tc08: is a drawing of DEC's TC08 DECtape Controller.
tc08-8-07: is an 8/2007 checkpoint of the TC08 drawing. This one does have the hidden "NC" layer, to simplify routing and reduce spurious error messages.

./DEC/TR02x: TR02 Incremental Tape Controller

tr02: is a drawing of DEC's TR02 Incremental Tape Controller. So far, only one of the two drive's controllers is complete.

./DEC/VC8x: VC8i Compatible Posibus Device.

vc8: is a drawing of a VC8/I compatible device built out of flipchips. It is based on this.

./DEC/Wxxx: Wxxx modules

./DEC/Wxxx/W005: Clamped Loads

W005: is a drawing of DEC's W005 Clamped Loads card.

./DEC/Wxxx/W023: Connector

W023: is an obsolete drawing for an 18 pin paddle card. (Use the one from the BusCon project.)

./DEC/Wxxx/W032: Connector

W032: is a drawing of DEC's W032 Connector cable paddle.

./DEC/Wxxx/W070: DEC W070 TTY Connector

W070: is a drawing of DEC's W070 TTY Connector card used with Negibus machines.

./DEC/Wxxx/W076: DEC W076 TTY Connectors

W076B: is a drawing of DEC's W076B TTY Connector card used with Posibus machines.
W076D: is a drawing of DEC's W076D TTY Connector card used with Posibus machines.

./DEC/Wxxx/W078: DEC W078 TTY Connector

W078: is a drawing of DEC's W078 TTY Connector card.

./DEC/Wxxx/W952: Wire Wrappable Module

W952: is a drawing of DEC's W952 Wire Wrap prototype board.

./DEC/Wxxx/W960: MSI Mounting Board

W960: is a drawing of DEC's W960 MSI Mounting Board, which allows 16 and 24 pin DIP components to be connected to a DEC backplane.

./DEC/Wxxx/W964: Blank Universal Terminator

W964: is a drawing of DEC's W964 Universal Terminator board.

./DEC/Wxxx/W975: Perforated double height board

W975: is a drawing of DEC's W975 double-height perfboard.

./DEC/X127026: Misc. Function Control

12706: is an incomplete drawing of DEC's 127026 Misc. Function Control board.

./DEC/xR210: Straight-8 Accumulator

smt: is a incomplete, half-hearted attempt at a surface mount version of the R210 Straight-8 Accumulator board.

./DEC9601: Functional equivalent to DEC9601 chip.

DEC9601: is an attempt to draw an equivalent for the DEC 9601 monostable chip.
libTest: is an failed attempt to create and use a library part for the equivalent. (The libary part is full of DRC errors.)

./EpromEmu: EPROM Emulator based on work of Philip Pemberton.

EpromEmu: is an adaptation of Philip Pemberton's EPROM emulator, which attaches to the parallel port of a PC.

./FlipChipTester: Various ideas for a flip-chip tester.

io: is a copy of the I/O board, for reference and component placement.
TestJig: is an incomplete notion involving a PCI slot.
io2: is another copy of the I/O board.
iotst: is an early version of the tester, which connects the I/O board from the ConsoleEmu project to a DEC connector block.
cblockyeesh: is a messy connector block mounting board that attempts to give each socket it's own connection.
cblockyeeshok: is a version of connectorblockyeesh which is fully routed.
cblock-vrs: is a simple connector block board that uses paddle cards to connect up to four sockets.
tester-7410: is a version of the tester board that builds a latch for the OC line using a 7410.
pcbproto-.brd: is a panelization of two copies of the tester, connector block boards, and an experimental G888 board.
pcbproto.brd: is a newer version of the panelization, with silkscreen scripts run.
FlipChip.brd: is still a newer version of the panelization.
cblock: is a version of the connector block board, modified to implement four pairs of socket connections.
tester-2: is revision 2 of the tester board.
transducer: is a messy design for a transducer for negative logic, etc.
transistor: is another messy design for a transducer.
smb: is a surface mount transducer using FET's and whatnot.
small: is a simpler transducer using through-hole parts.
cd4007: is yet another transducer, this time using the 4007.
5transistor: is a transducer for positive or negative logic, implemented with five FETs.
3transistor: is a transducer for positive or negative logic, implemented with three FETs and a section of an LM139 comparator.
32pins: is a set of 32 transducers of the 3transistor variety.
tester: is the flipchip tester, revision 1 (similar to iotst).
tester-rp: is another copy of the flipchip tester, revision 1.

./KM11: KM-11 Debug flip-chip

km11: is my version of the KM11 debug flip-chip. (The one by Guy Sotomayor is much better.)

./LogoPanel: Logo Panel for the top of the rack.

8ipanelb: is the outline of an 8/i logo panel.
8ipanel: is an 8/i logo panel, drawn in Eagle.

./M1709: OMNIBUS Interface Foundation Module

M1709: is a drawing of DEC's M1709 Omnibus Interface Foundation (I/O prototyping) board.

./M452r: M452 Replacement based on MC14411

M452r: is a replacement for DEC's M452 Baud Rate Generator, based on the MC14411 baud rate generator chip.

./M452S: Simplified M452X that lays out.

M452sx: is a version of the M452 replacement based loosely on DEC's M8655.
M452s: is a crowded version of the M452 replacement that routes in a single layer.

./M452X: M452 Replacement -- M8655 Style

M452x: is a version of the M452 Baud Rate Generator based on the M8655, but not finished.

./mmu6100: MMU for the 6100 PDP-8 on a chip

error: is a schematic fragment of the error circuitry.
mmu6100: is an early incomplete attempt at a 6100 with an MMU.
mmu6100x: is another incomplete attempt at a 6100 with an MMU.
mmu6100cp: is a snapshot of a nearly complete 6100 with an MMU.
ts6907: is a timeshare enhancement for the EMC 6907 MMU for the 6100.
emc6907: is a drawing of the EMC6907 MMU used with the Intersil Intercept (not the Junior).
vrs6907: is my design for an EMC6907 MMU board with the timeshare features added.

./NTC08: Bogus TC08 clone in TTL.

nt08: is an early version of a mechanical translation of the TC08 DECtape controller into TTL.
ntc08: is a start at a "big-board" version of the TC08 DECtape controller.

./PCBShop: Boards sent out for fabrication.

./PCBShop/M452x: M452 Replacement Board (as fabbed)

M452x: is the version of the M452 replacement that was actually built.

./PCBShop/W076x: W076 Replacement Board (as fabbed)

w076x: is an old version of the W076 replacement.
w076o: is version of the W076 replacement as ordered from the board fab.
w076oAsBuilt: is a version that matches the blue-wire changes in the as-shipped assembled boards.

./PosiDMux: FPGA PDP-8 Demultiplexer to Posibus

8j-merge: is the paddle card used to interface to the Posibus device.
posidmux: is an attempt to design an interface between the XESS based FPGA implementation of the PDP-8 and older Posibus gear.

./PT08: PT08 TTY Interface

PT08: is a drawing of DEC's PT08 TTY Interface for the PDP-8/S.

./RF08: RF08 Replacement

8x11: is an old version of all the boards for the RF08 replacement, panelized on an 8"x11" sheet.
RF08old: is an old version of the controller part of the RF08 replacement.
lights: is the debug display for the RF08 replacement.
drives: contains the "drives" for the RF08 replacement.
drivessop: contains a variation of drives that allows for the cheaper SMT versions of the SRAM chip.
RF08b: is the latest version of the controller for the RF08 replacement.

./RF08/Old8x12: RF08 Replacement (Old Version)

writelockswitches: is the writelockswitches board from the DF32 project, for reference.
RS08-.brd: is the disk emulator from the DF32 project, for reference.
RF08-: is the disk emulator from the DF32 project, for reference.
DF32-revision-B: is revision B of the DF32 project, for reference.
DEC8i-buscon: is a slightly updated version of the paddle cable used with the DF32 project.
DEC8L-buscon: is a paddle cable similar to the BC08J.
busadapt: is the bus adaptor board from the DF32 project.
DF32-revision-C: is an attempted revision to the DF32 board.
DF32-revision-D: is another attempted revision to the DF32 board.
DataBreak: is some schematic musings about data break.
array: is a design for an RF08-sized "drive".
cmorris: is the board from the DF32 project, yet again.
foo: is a tangled attempt to route a revision to the DF32 project.
RF08bck: is a checkpoint of some early work on an RF08 board.
RF08x: is a much more complete attempt at an RF08 replacement.
RS08: is a fairly complete RS08 "drive" pair.
RF08nv: is a newer version of the RF08 replacement, that didn't route.
RF08indx.sch: is the RF08 schematic with an extra sheet for the indicators and their drivers.
RF08ind: is a routed oversize board with the controller and the indicators.
olimex: is the controller and the drives, without the indicators.
spe10: is a set of controller, drives and indicators in an 8"x12.6" panel.
swizzle: is a swizzle board to allow the use of new paddles (34 wire ribbons) with the DF32 project.
RF08-1: is a revision to the controller that doesn't quite route.
RF08: is just the RF08 controller, in the panel by itself.
olimex10: is the RF08 replacement controller, drives, and indicators, all on an olimex sized panel, with 10mil design rules.

./rs-232-20ma: RS-232 converter to go in the Logic Lab

loop-rs232o: is an older version of the current loop to RS-232 converter (CTS flow control only).
loop-rs232: is a slightly newer version of the current loop to RS-232 converter, with CTS or DTR flow control.
sel-driver.sch: is a schematic of the selector magnet driver card in the TTY.

./RX08: Posibus version of RX8E

RX08-: is an older version of the Posibus RX08 controller.
l8r: is a somewhat newer version of the Posibus RX08 controller.
RX08: is the Posibus RX08 controller, as ordered from the board fab.
RX8E: is a drawing of DEC's RX8E Omnibus controller.
RX08b: is a revision to address problems found in the prototype.
RX08c: is another revision to address problems found in the prototype.
RX08b19: is the Posibus RX08 Controller as of 04/19/2005.
asbuilt: is the Posibus RX08 Controller as built, with all the blue wires (so far).
RX08-8-9: is the 08/09/2005 version.
kludge: is the schematic of the kludge daughter board being used to debug the prototype.

./RX08/RX08: The Posibus RX08 files as sent to the fab (prototype didn't work).

./RX8-Ulrich: RX8E to Posibus Adapter per Ulrich Fierz

rx08-ulrich: is a schematic for Ulrich Fierz's modifications to an 8/i and a TC08 to interface the RX8E.
pbusRX8E: is an attempt to modify Ulrich's design to remove the 8/i dependency.
rx08-vrs: is another attempt to modify Ulrich's design to remove the 8/i dependency, and makes the Omnibus connections more explicit.

./RXM: RX01/RX02 Emulation with a PC

rxm: is a drawing of Charles Dickman's card to interface emulate the RX02 with the parallel port of a PC.

./SMT-8: Thoughts about a discrete SMT PDP-8.

adapter: is a drawing of an adapter from the DEC connector to something more current and affordable (2x20 header).
r202smt: is an SMT version of the R202 flip-flop board.

./TU56x: TU56 Drive Emulation

tu56: is a drawing for a proposed TU56 replacement using anSD card.
tu56o: is a older, less flexible version.

./W076O: W076 for either RS-232 or Current Loop

w076o: is a board to implement M8655 style interface to RS-232 or current loop for machines which use DEC's W076 card.

./Watch: PIC based timepieces

bcdwatch: is a drawing of an SMT version of a BCD wrist-watch.
watch: is a drawing of an SMT version of a binary wrist-watch.
clock: is a drawing of a binary clock using a 5704 dot-matrix display.

./WireWrap: DEC Compatible Wire-Wrap boards

1highfront: is a single-height prototyping board for narrow DIPs up to 32 pins.
1high: is a single-height prototyping board for narrow DIPs up to 32 pins.
2high: is a double-height prototyping board for narrow DIPs up to 32 pins.
4high: is an Omnibus form-factor prototype card that will take DIP packages in narrow or wide form up to 42 pins.

./X: M452 Replacement

M452sx: is a drawing of a replacement for the M452 Baud Rate Generator based on the M8655 (doesn't route).

./X4915: DEC 4915 Reader Control for ASR-33.

4915.sch: is a schematic for DEC's 4915 Reader Control modifications for the ASR-33.

./X8iPanel: PDP-8/i Front Panel PCB

foo: is a messed up version of the indicator PCB of an 8/i front panel.
M900dec: is a drawing of DEC's M900 paddle card, which contains the indicator drivers, as well as connecting to the front panel cabling.
M900: is my version of the M900 indicator driver card, which provides through-hole (ribbon cable header) connections as well as DEC's surface mount.
d-cs-8i-0-27: is a schematic of the M900 indicator sockets in the 8/i backplane.
8iPanelDec: is a drawing of DEC's indicator PCB, using the surface mount ribbon connectors.
8iPanel: is my version of the indicator PCB, allowing through-hole headers for ribbon connection, as well as DEC's original surface mount.
8iPanelLED: is a version of 8iPanel with current limiting resistors suitable for the use of LEDs instead of indicator lamps.
protol: is a version of my indicator panel, broken in two, so it could be ordered from a protoype shop.
proto2.brd: is a panelized set of six M900 boards, suitable for ordering from a prototype house.
8iSwitches: is a drawing of a replacement for the switches PCB.
8iSwitchesOK: is a checkpoint of the replacement for the switches PCB.
W077: is a pull-up and clamping module for the switch register of the PDP-8/i.

./XDS32: DS32 Disk Drive Emulation

ds32: is a preliminary drawing of a replacement for a DS32 disk drive, which would attach to a DEC RF08 controller.

./Xeltec: Replacement for Xeltec SuperPro interface card.

foo1: is a messed up old version of the SuperPro card.
fie: is a messed up old version of the SuperPro card.
SuperPro: is a replacement ISA card to interface the Xeltec SuperPro to a PC.
SuperPro-res-moved: is a newer version of the replacement ISA card to interface the Xeltec SuperPro to a PC.

./XMM8i: Memory extension for PDP-8/i.

mm8i: is a start on drawing the MM8/i memory extension.