[Techtoolslist] Fluke 9010 ram test for 4 bits? Or any non 8 bit wide memory?

[Andrew Welburn]

9100 tests any bit-size of ram natively with masking, no need for any 
programming...

so non 8-bits a 9010 problem apparently...

Andrew Welburn
andys-arcade

On 5/28/2023 1:59 PM, John Robertson via Techtoolslist wrote:
> On 2023/05/28 12:55 p.m., davids at oz.net wrote:
>> Have a suspect bad pallet ram on Missile Command, and I see that it is on
>> the CPU memory map so I should be able to get to it from the fluke.
>>
>>
>> Now it is only 4 bits wide (and only uses 8 addresses) so I can just 
>> do it
>> manually but I have seen this on other boards before and never could 
>> find a
>> way to use the fluke to test these 4 bit rams.
>>
>>
>> Would also assume it could be a problem for 68000 based boards which use
>> 16bit wide memory.
>>
>>
>> David
> 
> Yes, I've grumbled about this in the past too. Many games ues 5101s for 
> battery backup memory andother than poking numbers like AA and 55 at the 
> memory space and ready it back it can't be easily tested.
> 
> I though of making a simple 4-bit memory device that would cover the 
> other data lines and it would also match the memory map for the UUT 
> 5101, but never got around to it as the AA/55 test worked pretty good 
> just picking a few locations. One alternates the test number and reads 
> the space one is going to write to make sure the RAM isn't mirroring the 
> same data throughout.
> 
> It would be nice to make a good 4-bit memory test for the 9010A and the 
> 9100X - if someone wants to write and share it here I'm sure they would 
> earn lots of Karma!
> 
> Currently I'm trying to pull the Gottlieb System 80 test out of Ian 
> Eure's much appreciated Github archive:
> 
> https://github.com/ieure/fluke-9100-disk-archive
> 
> to take a look at it (how does it handle the 5101 testing?), I just 
> don't have the time at work, and no XP/AT/W95/XT computer at home to 
> convert the files into something I can read...
> 
> Time, eh, the big enemy!
> 
> John :-#)#
> 
> PS, I'm going to change TTL so it replies to the list, not the poster, 
> it keeps throwing me and I suspect may annoy others. I know it SHOULD do 
> a reply to poster, but I prefer these discussions in public unless the 
> participants choose to go to private email (which is just fine), so we 
> all can benefit from sharing the knowledge, as well as errors made and 
> learned from...
> 
>>
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