At 02:49 PM 9/19/98 -0700, Sam wrote:
>On Sat, 19 Sep 1998, Tony Duell wrote:
>
>Today I plugged in the front panel and a Cromemco ZPU. It worked! The
>address LEDs 15, 14 and 13 are sequencing in a binary pattern. I don't
>know what this means, but at least it shows life. I got the same results
>with another ZPU. I can single-step it and see different stuff happening,
>but I have no idea what its doing. I buried my friggin IMSAI manual in a
>box a few weeks back.
No memory installed? It is executing a RST 7 (0FFH) which pushes the
current address onto the stack and jumps to 038H (070 octal), and finding
yet another 0FFH there, repeats the exercise forever... You are seeing the
stack pointer reflected in the lights when running...
It's a good sign.
-jim
---
jimw_at_agora.rdrop.com
The Computer Garage - http://www.rdrop.com/~jimw
Computer Garage Fax - (503) 646-0174
Received on Sat Sep 19 1998 - 19:44:11 BST