Am 21.05.2018 um 11:06 schrieb afachat@gmx.de: > I have a floppy disk controller I got on an aution a while ago, although due to > my current time constraints and priorities I did not have time to further look > at. > > It is from COMPUTHINK (it says so on the back), some other texts on the board > read: "FAB 5000120-000" and "DD DSK CTL P2", "ASSY 1000176". > Hand written there is the number "401614" (serial#?) That should be the same one I have. > > It has a 1791 disk controller chip on it ("FD1791-B01"), one TTL IC is > unfortunately missing, but everything is socketed. On mine (and at least two more I know of) there was a PROM missing, so I think, some of them were delivered without the PROM. The controller works with or without a PROM. It seems to only contain a serial number. > Three power regulators, +5V, +12V, -5V. It seems to plug into the two > expansion connectors on the PET although I think the layout is wrong, as both > (single-line!) are aligned with each other, not displaced/shifted as in the > later dynamic/universal PETs. That's right, it works in the dynamic PET (30xx) - and it works FAST, since it uses the 8KB RAM on the controller to buffer a track at once. I tried it with two SA-400 drives, which works fine. Up to 4 drives can be used (all 4 drive select lines are used). With double sided drives, each side is treated as an independet disk, so you see up to 8 disks with the DOS (diskmon). So, with single sided drives, you have two drive numbers for the same disk side. Disks can be imaged/duplicated on a MS-DOS PC with a 360KB drive using Teledisk. It also works with a HxC floppy emulator. The HxC software can convert the Teledisk .TD0 images to it's own image format. I put together some files that should be helpful to get it working: http://www.idealine.info/CBM/CompuThink.zip -- Christian Dirks Toast_r@Idealine.info Vorster Str. 66 47918 Tönsivorst 2. Stellv. Vorsitzender Verein zum Erhalt klassischer Computer e.V. http://www.classic-computing.de/
Archive generated by hypermail 2.2.0.