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Search took 0.00 seconds. Search: Posts Made By: Geoff Harrison
Forum: Altair 680 06-19-2008, 08:42 PM
Replies: 26
Views: 82,983
Posted By Geoff Harrison
I see. In fact I see now on the circuit diagram...

I see. In fact I see now on the circuit diagram that the processor & motherboard R/W pins are not connected together, I didn't notice that yesterday. Sorry about that Bugman, I'm glad I didn't send...
Forum: Altair 680 06-19-2008, 11:56 AM
Replies: 26
Views: 82,983
Posted By Geoff Harrison
I like the front panel too, but it doesn't really...

I like the front panel too, but it doesn't really have the functionality to do anything useful. It is missing the examine_next, deposit_next, and start_at_address functions that are pretty much...
Forum: Altair 680 06-19-2008, 10:50 AM
Replies: 26
Views: 82,983
Posted By Geoff Harrison
Great. And congratulations on getting it...

Great. And congratulations on getting it running. It's a fun little machine, isn't it?

Geoff.
Forum: Altair 680 06-19-2008, 12:05 AM
Replies: 26
Views: 82,983
Posted By Geoff Harrison
Ah yes, that would be a Bad Thing. That's the...

Ah yes, that would be a Bad Thing. That's the Read/Write line from the CPU. I don't see anything on the circuit diagram that's not meant to pass through to the motherboard.

Geoff.
Forum: Altair 680 06-18-2008, 11:18 PM
Replies: 26
Views: 82,983
Posted By Geoff Harrison
Well that's encouraging. Unfortunately, I don't...

Well that's encouraging. Unfortunately, I don't have a memory expansion board, so I'm not going to be much help there. Maybe Grant will have some suggestions when he logs in.

Geoff.
Forum: Altair 680 06-18-2008, 07:53 PM
Replies: 26
Views: 82,983
Posted By Geoff Harrison
Ok, I knew I wasn't (completely) crazy. You can...

Ok, I knew I wasn't (completely) crazy. You can run the front panel without the CPU, but you have to pull BA (CPU pin 7) high. I removed my 6800 and connected CPU pin 7 to pin 4 (IRQ) which is tied...
Forum: Altair 680 06-18-2008, 03:08 PM
Replies: 26
Views: 82,983
Posted By Geoff Harrison
Well, I guess I don't know what I'm talking...

Well, I guess I don't know what I'm talking about. I can't get the front panel to do anything without the CPU now, so forget what I said.

Geoff.
Forum: Altair 680 06-18-2008, 02:47 PM
Replies: 26
Views: 82,983
Posted By Geoff Harrison
That's where I would start. Also, make sure your...

That's where I would start. Also, make sure your power supplies are not taking a while to stabilize, but that's a long shot. It might be instructive to pull the CPU chip and power it up. If the...
Forum: Altair 680 06-18-2008, 12:44 PM
Replies: 26
Views: 82,983
Posted By Geoff Harrison
No, no delay at all. I'm not using the switching...

No, no delay at all. I'm not using the switching power supplies, but I doubt there would be any difference. When I power up there's no discernible delay before the the lights show whatever the...
Forum: Altair 680 06-18-2008, 12:38 PM
Replies: 26
Views: 82,983
Posted By Geoff Harrison
Does that happen when the halt/run switch is in...

Does that happen when the halt/run switch is in the halt mode?

With mine, if I power up with the switch set to halt, the lights are instantly stable.

Geoff.
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