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Good eye. In fact, comparing the two layouts, the Transmitter shows the 7417 chips reversed as well. The Receiver has all the chips aligned as expected.

Very interesting. It looks like two configurations of the same card. The "Receiver" would be the one I was aware of (and the one that was advertised), to allow the SBII to control the 48-line bus. The "Transmitter" configuration just has all the 7417's plugged in backwards. There are jumpers to inve...

If I can get it running I'll show some photos of my Video mod. How do you insert photos here???? drwass2 That's great news. To insert photos, find the "Upload attachment" tab just below the post entry box. Click it, and select your photo to upload. Once you've uploaded all your photos, each one wil...

Hi Dave, I compared your "Default" wiring denoted in yellow above to my 505 board, and I'm not sure I understand your logic. ... So, following that... If I were to convert it for BASIC-IN-ROM, I would just change the $FFxx Jumper (Pink) to point to page 3 - 'C/W/M' like this: ... Am I correct, or a...

I have been looking at this as well as the SAMS schematic for the 505 ROM. Am I correct that there is a second step of cutting the trace to R54, the pull up resistor for the page you wish to re-assign, and, attaching the old, now unassigned page's pin to that resistor? /Jeff You are correct. The 50...

Hi Tom, There are some good suggestions already. I assume you have the OSI 600 schematics on hand. I think the OSI schematics are easier to follow than the SAMS drawings. With no video out at all, you should start with the main oscillator circuit and check that out. Start with pin 1 of U29, then pin...

I'm curious whether anyone has experienced any issues using OSI diskread or rawread. I recall using rawread years ago and finding it pretty straightforward. Until now, though, I haven't had a full working system to make disk images with. I recently repaired a B51 (the control electronics that is; it...

Tom,

That looks really nice. Any chance of your posting it here, or send me a copy? With your permission, I'd like to host it on the software page.

Thanks,

Dave

Definitely try to find them. This would be of great interest to many C1P owners.

Dave

Hi Tom, Welcome! Great story. If you are agreeable, I'd love to host a copy of your lunar lander program on the site. The software section has been much neglected, but I think that 2015 is the year it will become a meaningful resource. Please, consider posting your repair efforts in a thread here on...