Re: [N8VEM-S100:6393] AIRBL 8080a boot loader ROM

[litte...@mchsi.com]

I have a similar memory error, but mine fails at 042A.

At this time I am unable to load from SD card. I'm still 
working on that part.  

I also tried burning the ROM on a M27C256 or Atmel AT27C256
but the end results are still the same



   
----- Original Message -----
From: "Crusty OMO" <crus...@hotmail.com>
To: n8vem...@googlegroups.com
Sent: Saturday, February 21, 2015 4:52:59 PM GMT -06:00 US/Canada Central
Subject: RE: [N8VEM-S100:6393] AIRBL 8080a boot loader ROM


Yes, the RAM test from the boot menu of version 2.3 (Directory, RAM Test, View Load). 
This RAM test will do RAM from F000 to FFFF, which is where the BIOS is and can't be tested with the monitor program. Hence, I call it system RAM. Hmm, it shouldn't do that error with you... try swapping the RAM chips... wait... first boot up to the monitor then test the lower RAM with the command R 00 7F 
This will test ram from page 00 to page 7F (ie 0000 to 7FFF) which is the whole lower chip. Now, swap the RAM chips, and do each test again, the system RAM test and the lower RAM test... I'm wondering if there's problems with the RAM or if the board has a timing issue? 





Date: Sat, 21 Feb 2015 10:38:07 -0800 
From: jeffrey.h...@gmail.com 
To: n8vem...@googlegroups.com 
Subject: Re: [N8VEM-S100:6391] AIRBL 8080a boot loader ROM 


On Saturday, February 21, 2015 at 11:01:39 AM UTC-7, Crustyomo wrote: 



Hi Jeffa, 

Oh great! I'm happy it's working. I'm now wondering how critical having a 27C256 is? Did you have to swap any RAM? Did you do the System RAM test? 

Cheers, Josh 





I'll check.... 


I just burnt a 27256 (not c) it worked. 


I didn't swap / replaces any ram. 


There are two ram tests, I don't specifically know which you are referring to by 'System RAM test' The ram check fails from the first menu at 045C. If I load the monitor from that first menu and do the Ram check there it passes when I press R and <cr> <cr>. cp/m will boot. And seems to run. 


If you like I'll swap out one of the RAM chips, which one? 


- jeffa 


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