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@Dave: Here are the scans of the Progressive Computing C1P Video mods. Feel free to host them. http://www.jeffferguson.ca/OSI/ProgressiveComputingVideoMod/C1P%20Video%20Mods.PDF http://www.jeffferguson.ca/OSI/ProgressiveComputingVideoMod/Video%20Mod%2032.PDF http://www.jeffferguson.ca/OSI/Progressiv...

That's exciting, Bill! I have a 600D and another 610 raw boards sitting in a drawer as a retirement project, but your progress on the 600 has me wanting to pull them out and build them! I am planning on collecting all the parts, burning the EPROMS and then putting it all in a box for later.

/Jeff

R10 RX Clock Remove floppy-disk cable (J3). Connect a jumper from pin 9 of J3 to pin 10 of J3. Input of scope to pin 5 of U70. Adjust R10 for a positive pulse width of 1uSec. R10 Adjustment.jpg R19 RX Data Remove floppy-disk cable (J3). Connect a jumper from pin 9 of J3 to pin 11 of J3. Input of sc...

Today I made the electrical adjustments on the 610 so support reading and writing to the floppy drive. I figured I would post the procedure so that the information is central for future builders. R18 TX Clock Remove floppy-disk cable (J3). Input of scope to pin 13 of U68. Adjust R18 for a positive p...

Hi Bill,

Great work, so far!
Which Cherry Keyswitch model, part number did you order for the board? Also, were you able to get a shift lock key?

/Jeff

Can anyone with an actual OSI 610 confirm the value of R20?

/Jeff

Well it's been a year to the day, I'm wondering if the schematic has yielded any secrets. ;-P

Thanks, Steve

@Bill, well look at it this way, you can savour the project longer ;-D

/Jeff

Two words: PLOT BASIC. It is a later version of BASIC that supported hi-res graphics.