AltairClone.com

Ok, if A1 is not stuck on, that changes everything about what we need to look for. The video is a bit grainy for me, but it appears that HLTA is on?

Mike

Hopefully unlocked now...

Here is a better version of the video http://hawken.sdsmt.edu/8800panel1080p.mov

Yes, the HLTA light is on since I swapped chips around. In the earlier picture I sent it was off. I put all the original chips back, but HLTA is still on

Here are pics of the two boards. Maybe you can see somewhere where I screwed up

Front panel interface

Between the D4 issue, HLTA issue, and examine problems, these could all be caused by bad 8T97s. Do you have some 74LS367s you can use instead?

Mike

AltairClone wrote:Between the D4 issue, HLTA issue, and examine problems, these could all be caused by bad 8T97s. Do you have some 74LS367s you can use instead?

Mike

I'll hunt around

I had an LS367 lying around. I swapped it out for IC-B and the A1 light went away. I found a few others on old boards and swapped them in, too. Back to the A1 light being on. I put the 8T97s back in, except for the LS367 at IC-B, and the A1 light is still on. Now I'm not sure if it was IC-B I swapped out to start with. I'm stumped

I've ordered a new set of LS367s to replace the 8T97s. Should have them in a couple of days

What happened with the D4 problem and the HLTA light problem while you were swapping parts?

Mike

No change with the LS367 in it

Ttpilot wrote:No change with the LS367 in it

Sorry, but I’m confused because I have no idea exactly what you’re changing. There are numerous 8T97s on the CPU board. IC-B might affect the A1 problem. IC-E might affect the D4 problem. IC-G might affect the HLTA problem. You say no change with the LS367 in “it.” What position is “it?” And I thought you found and tried multiple LS367s, not just one (“it”). Please let me know specific tests and specific results.

Mike

I've now got a 367 in IC-B, IC-E, and IC-G. For some reason I had them in different spots until now. I'll do a quick video of the results