Elusive 630 board

[Klyball]

Whoo hoo I came across a 630 board , added the chips to the 600d cut the 2 traces and added the jumper and its outputs b/w composite, and looks like the rgb signals are good just need to make a cable to fully test ,but I see no reason it won't work.

Here is the interesting part ,if you look at the bottom right corner there is a space for 5 chips a crystal and support components. I haven't 100% confirmed the layout but seems to be identical to the 540b color composite output circuit. I wonder why its not mentioned anywhere that I have seen or even on the schematic. The schematic parts layout is identical minus the undocumented components.

I have started on the replica to complete the 600,610,630 set.

20211022_205924.jpg (7.49 MiB) Viewed 5112 times

[Steve Gray]

Looking forward to seeing the colour!

[Mark]

Please take a picture of the board as it one of the long missing images from my OSI hardware board list!

Thanks!

[dave]

I have started on the replica to complete the 600,610,630 set.20211022_205924.jpg

Fantastic!

[lowrybt1]

Boy, this brings back memories from 1981+ when I desperately wanted to find a 630 board and add color to my C1PMF. I thought it was true vaporware.

[Klyball]

I can confirm that the missing chips do correspond to sheet 6 of the 540B schematic and the circuit inputs are connected .

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image19.png (52.5 KiB) Viewed 4773 times

[Mark]

Can anyone confirm the color video RAM memory location for the 600D?
Normal 1K screen memory is located at D000 through D3FF. Is the 4bit color RAM at D800-DBFF or D400-D7FF or ???

Thanks!

[Klyball]

D400-D7FF 1024 offset to video ram

[Steve Gray]

Don't know if this is of any use. I made it while trying to sort out my colour board... sorry for the roughness.

OSI Superboard RevD Address Decode.pdf

(330.01 KiB) Downloaded 368 times

[Mark]

Thanks,
that helps.

I am trying to verify U72 control port. From the OSI schematics it looks like:

Code: Select all

OSI 600D U72 74LS174 Hex D-Flip Flop
-----------------------------------------------
 D0 = (pin  7) /32 
 D1 = (pin  5) Color Enable
 D2 = (pin  2) BK0
 D3 = (pin 12) BK1
 D4 = (pin 15) DAC Disable
 D5 = (pin 10 NC?)

it differs a bit from your notes. I was just verifying WinOSI handles this correctly.

Also has anyone run across any C1 programs that use color? Thanks!