19 Sep
1998
19 Sep
'98
12:44 p.m.
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(a)agora.rdrop.com
The Computer Garage - http://www.rdrop.com/~jimw
Computer Garage Fax - (503) 646-0174
19 Sep
19 Sep
5:26 p.m.
On Sat, 19 Sep 1998, James Willing wrote:
No memory installed? It is executing a RST 7 (0FFH)
which pushes the
Nope. No memory yet. I still have to figure out how to set the jumpers
on the Dynabyte 16K Static RAMs I've got. I know I have docs somewhere
but they're buried.
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.
COol. I knew it was a good sign. That makes sense then, since in single
step mode the address and data patterns kept repeating after about 5 or 6
steps.
Sam Alternate e-mail: dastar(a)siconic.com
-------------------------------------------------------------------------------
Ever onward.
September 26 & 27...Vintage Computer Festival 2.0
See http://www.vintage.org/vcf for details!
[Last web site update: 09/12/98]
9591
days inactive
9592
days old
1 comments
2 participants
participants (2)
-
dastar＠ncal.verio.com -
jimw＠agora.rdrop.com