Re: [N8VEM-S100:6340] Re: IMSAI 8080A CPU board help.

[litte...@mchsi.com]

As a general question to those that have built this board,  

What is "normal operations ?"

IE:

You boot it up and get the menu/prompt.

Then it displays five dots and a space and starts over. (mine repeats forever)

Is it polling for a input of D, R or V from keyboard or trying to load the SD card? 

Is this normal for others ?  I have yet to see the SD LED Flash.



----- Original Message -----
From: "Crusty OMO" <crus...@hotmail.com>
To: n8vem...@googlegroups.com
Sent: Wednesday, February 18, 2015 7:40:17 AM GMT -06:00 US/Canada Central
Subject: RE: [N8VEM-S100:6340] Re: IMSAI 8080A CPU board help.


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. 




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: 


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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