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Forum: Altair 8800 09-03-2009, 05:55 PM
Replies: 2
Views: 3,776
Posted By rfeecs
That explains it. Actually, from the point...

That explains it.

Actually, from the point of view of understanding how the 8080 CPU works and looking at the status lines, stepping one machine cycle at a time is better.

I agree the...
Forum: Altair 8800 09-02-2009, 08:09 PM
Replies: 2
Views: 3,776
Posted By rfeecs
Emulator Status LEDs

I was playing with Rich Cini's Altair32 emulator and noticed that the status LEDs change when I single step. According to the theory of operations manual, the Altair stops and steps only at...
Forum: Altair 680 06-07-2008, 05:41 AM
Replies: 7
Views: 6,391
Posted By rfeecs
Since the 7805 can only sink a few mA, it will...

Since the 7805 can only sink a few mA, it will not be able to regulate without a load because of the 15 ohm resistor. Probably the resistor is added in an attempt to boost the maximum current...
Forum: Chit Chat 03-18-2008, 09:03 PM
Replies: 25
Views: 21,636
Posted By rfeecs
So Many Replicas!

I compiled a short list of replica projects. Unlike Grant's remarkable kits, most of these are using new hardware to mimic the look and feel of the old times:

PDP-1 replica:...
Forum: Altair 680 02-04-2008, 05:33 AM
Replies: 6
Views: 7,659
Posted By rfeecs
Yet more on single stepping the 6800

I have been surfing around sites about vintage computers, and stumbled across Dr. Robert Suding's page about the history of the digital group: http://www.ultimatecharger.com/dg.html

He says:
I...
Forum: Altair 680 02-01-2008, 11:49 PM
Replies: 6
Views: 7,659
Posted By rfeecs
Single stepping 6800 is possible

To quote the 6800 datasheet:

To debug programs it is advantageous to step through programs instruction by instruction. To do this, HALT must be brought high for one MPU cycle and then returned low...
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