[Techtoolslist] RAM testers

[Piero Andreini]

I made a usb programmer for Eprom 2708 and i started to implement even ram test for sever one but i never completed the work (addressing tests should be implemented).

I can release the source code (assembler Microchip PIC 18F4550) if anyone wants to finish the test routines for these types of triple-power RAM.

NeoLock made also a nice ram tester but only for single power supply. maybe possible to made adapter for  triple-power RAM.  Changes to be made to the firmware would be minimal, it contains already all the correct pattern and address test.

Piero (pieroandreini at vodafone.it)

> Il giorno 17 ago 2018, alle ore 01:53, John Robertson <jrr at flippers.com> ha scritto:
> 
> Hi Joe,
> 
> Why not make an adapter socket or add a switch (or two)? The difference between the 4027 and 4116 is pin 13 which is /CS and A6 respectively. Hopefully the Bugtrap test is not as extensive as Flukes RAM test which looks for stuck address lines such as the none functioning A6 on 4027 adapter.
> 
> I can't find 4015 easily, but same applies to it...
> 
> John :-#)#
> 
> On 2018/08/16 3:57 PM, Joe Magiera wrote:
>> Does anyone know of any RAM testers or other ways to test 4027 and 4015 RAM?
>> The Bugtrap I use to test 4116 can't do them and NeoLoc's RAM tester can't
>> do them either.  A fair number of games use this RAM type.
>> 
>> 
>> Joe (joemagiera at Ameritech dot net)
>> 
>> joemagiera at ameritech.net
>> 
>> 
>> 
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