RL02 Disks

I have two RL02 disk drives:

My RL02 drives, cables, a couple of disk packs.

These theoretically hold about 3.5Mwords per disk pack. In practice, 128 words were stored per sector, not 170, so the effective capacity on a PDP-8 (running the usual operating system) was 2 surfaces X 256 cylinders X 40 sectors/track X 128 words, or 2,621,440 12 bit words.

They were also about half-again as fast as the RK05.

I plan to rack these up properly and hang them off one of my PDP-8/A CPUs. The RL8A controller for them requires a hex backplane slot, which is too large for an 8/E (without an expansion backplane, anyway).

Last updated on 12/20/11 09:11