Todd,
Looks like you've found a bug in my RAM test routine. When it errors, it should report the location of the error, since it's only testing F000-FFFF, then it shouldn't report 042A. But since it is giving an error, and this doesn't happen on my board (I better recheck it tonight after work), then I would think there's something wrong with the RAM circuit. Perhaps their could be a problem with some types of RAM? Maybe even the CPU chip might be causing the trouble?
Well, time to run to work....
Cheers,
Josh
Date: Tue, 17 Feb 2015 19:48:45 -0800
From: litte...@gmail.com
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:6340] Re: IMSAI 8080A CPU board help.
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Looks like you've found a bug in my RAM test routine. When it errors, it should report the location of the error, since it's only testing F000-FFFF, then it shouldn't report 042A. But since it is giving an error, and this doesn't happen on my board (I better recheck it tonight after work), then I would think there's something wrong with the RAM circuit. Perhaps their could be a problem with some types of RAM? Maybe even the CPU chip might be causing the trouble?
Well, time to run to work....
Cheers,
Josh
Date: Tue, 17 Feb 2015 19:48:45 -0800
From: litte...@gmail.com
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:6340] Re: IMSAI 8080A CPU board help.
Thanks, My Prop was similar except this
was how I had it strapped for my setup;
P77 P76
x-x x-x
x-x x-x
I changed it to your setup and now it displays key-press
except, it only responds to 'R' key-press.
> . . r
Testing SYSTEM RAM @F000-FFFF
RAM PAGE MARCH.
FAILED AT:042A - SYSTEM HALTED
When does it try to boot to the SD card ?
If you have time, how is your CPU board strapped ?
On Monday, February 16, 2015 at 1:45:14 PM UTC-6, Todd Miller wrote:
was how I had it strapped for my setup;
P77 P76
x-x x-x
x-x x-x
I changed it to your setup and now it displays key-press
except, it only responds to 'R' key-press.
> . . r
Testing SYSTEM RAM @F000-FFFF
RAM PAGE MARCH.
FAILED AT:042A - SYSTEM HALTED
When does it try to boot to the SD card ?
If you have time, how is your CPU board strapped ?
On Monday, February 16, 2015 at 1:45:14 PM UTC-6, Todd Miller wrote:
Booting up Crusty's 8080 CPU board with ver 1 of
the Prop I/O card. The Boot loader flys off the screen
like a key is being held down. I can see the message;
Altair/Imsai <banner>
<D> Directory
<R> Ram Test
<V> View Load
>
First few boots I missed it, too busy looking
at the SMB, but then caught it out the corner
of my eye. Rebooted and stopped the CPU after
I saw the menu.
I'm guessing I don't have the Prop I/O set up
for the correct "status bits" for KEYBOARD
in/out. I recall dealing with this to match
it up to my ver Dos.
What should it be set to ?
JP8/JP9 all jumpered
JP10 no jumpers, don't understand...
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