looking for RX01 device IOTs for the PDP8/e

Gooijen, Henk henk.gooijen at oce.com
Fri Jan 13 03:21:15 CST 2006

Hi all,
I finished the tests of the DOS for the CoreSYS 6809 with the 2793 FDC
extension board, and I figured that it would be nice if I can add that
floppy disk drive to the pdp8/e simulator that runs on the 6809!
See www.pdp-11.nl/homebrew/floppy/diskstartpage.html  (at the end).

I will of course not be needing 'my' DOS (except the read/write sector
routines) as OS/8 will handle the file system for me.
However, I need the description of the (pdp8) IOTs for the RX01 device
to implement the floppy disk in the simulation.  I have not been able
to find that on the web, so I don't even know how difficult implementing
those IOTs will be. For example, the real disk sector size is just 128
bytes, which would mean (in pdp8 emulation) that the 'virtual' sector
size is 64 words. It is likely that I need some disk access translation
to read/write data, but the IOT descriptions will (hopefully) make that
Can anybody point me to where I can get the pdp8 RX01 IOT descriptions?

- Henk, PA8PDP.

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