[Techtoolslist] Berzerk and Fluke 9010a

[Grant Thienemann]

Hey John,

Thank you so much for the information! I'm still learning how to use the
Fluke 9010a honestly, I'm very new to it, so I'm also trying to figure out
how to correlate the memory address that I'm testing on the 9010a to the
physical ram on the PCB itself.

Thanks
Grant


On Mon, Apr 21, 2014 at 3:44 PM, John Robertson <jrr at flippers.com> wrote:


> On 04/21/2014 12:19 PM, Grant Thienemann wrote:

>

>> Hey Guys,

>>

>> I'm bound and determined to get my Berzerk working again. Currently I have

>> it working to the point that the game will boot however the game will

>> freeze randomly. List of things I have done:

>>

>> New sockets on the ZPU-1000 with new EPROMs and Z80 processor

>> New ram sockets on the VFB-1000 and I have 4164 ram and 4116 ram that I'm

>> looking into putting onto the VFB-1000.

>>

>> The BSC-1000 color board is fine, and the cleanest board I have on the

>> machine.

>>

>> When I go to do the short ram check on my Berzerk board set, the 0-7FF

>> fails, however the second one, 1000-17FF if I remember passes correctly.

>>

>> If anyone knows any tips or tricks with using the Fluke 9010a with a

>> Berzerk board set I would appreciate it.

>>

>> Thanks

>> Grant

>> ____________

>>

>

> If the RAM test fails in one section, but not another then you likely have

> a problem with a RAM chip. If you have 4-bit chips then you can tell which

> it is by the error code - if it is X- that is the High 4-bit RAM, and if it

> is -X then that is the low 4-bit RAM. Where "X" indicates the bad read.

>

> I use "55" and "AA" write then read to suspect RAM and this can show up

> the errors a bit faster.

>

> Say you write 55 and then read 51 - that means the lower 4-bit RAM has a

> stuck bit (Bit 3 always low). Now you may get 55, so then you try AA which

> may give you A2 and again that indicates a bad lower RAM Bit 3.

>

> John :-#)#

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