[vcf-midatlantic] RAM Test/Diagnostic ROM for Rockwell AIM-65

[Douglas Crawford]

Oh dang.. that makes an AIM project a lot more viable.
A good starting point to bring one up & maintain.
Oh Jonathan, you trouble maker...

On 8/19/2022 11:52 AM, Dave via vcf-midatlantic wrote:
> Nice one Jonathan!
> 
> This will come in handy.
> 
> Dave
> 
> Jonathan Chapman via vcf-midatlantic wrote on 8/19/22 8:08 AM:
>> All,
>>
>> Finally got some time to clean up the source for our RAM 
>> test/diagnostic ROM for the AIM-65:
>>
>> https://github.com/glitchwrks/aim65_memtest/
>>
>> Initial work was largely done by TangentDelta. This was written to 
>> help diagnose and repair some dead AIM-65s. The test will run on a 
>> minimally functional AIM-65 -- all you need is a working CPU, ROM 
>> socket, and display board. It performs the following tests:
>>
>> * ROM checksum
>> * Stack page quick write presence
>> * Zero page quick write presence
>> * RIOT single-pass memory test
>> * Full system memory test
>>
>> The ROM checksum and stack page tests are accomplished with macros so 
>> that they can run with no RAM, since of course that might be faulty! 
>> Once the stack page passes, zero page is tested. With stack and ZP 
>> tested, the RIOT and exhaustive system memory tests are performed. 
>> These tests are more complete, since we have a minimally functional 
>> system by this point. The exhaustive test is based heavily on the 
>> routines from the OSI MEMORY TEST from OS-65D 2.0, published in OSI 
>> Small Systems Journal, Volume 1, Number 3, September 1977.
>>
>> Thanks,
>> Jonathan
>