Re: Fluke on Universal Boards (Cosmic Alien etc.)

At 16:10 18/01/01 -0800, you wrote:
>You know that you can turn off some of the error messages for the Fluke?
>Sometimes there is a Watchdog Reset that can give results like that. What
>is the speed of the Z80 in the game? Is it a straight Z80 or an "A" or "B"?
>I have a Z80 pod that is named Z80AA, I winder if it is faster than the
>standard Z80 pod. The code for it is a bit different, but it looks the same
>inside...on a cursory glance...don't recall the speed of the Z80 mind
>you...I think it was an "A"
>
Hi John :-
Thanks for your reply I have tried both variants of the Z80 and it seems to
make no difference, but strange to say I had a number of Z80,s which I
tested on a K.T.B.G. Galaxian board and all worked OK. when I tried them
in the cosmic alien ,out of say 8 chips only 3 worked umm wonder if it is a
speed problem.

The clock appears to run at 2.7Mhz when measured on a Hameg 60Mgh
Scope????????.
I cannot find anywhere on the Drawings the facility to disable the watchdog
I suppose I could tie the input to the cpu reset Hi but you never know if
the circuit expects to see a low to hi transition at boot-up!!!.
your thoughts on this would be most welcome.

Regards pete (Invadar)

>
>At 03:23 PM 1/18/01, Peter Davies wrote:
>>I wonder if anyone can throw any light on a strange problem
>>I'm having when I connect the Fluke 9010a up to a Universal Cosmic Alien
board
>>
>>:- I connected up a 'known to be good' cosmic alien board in order to learn
>>the rom locations, sig's, ram locations,etc. the board has a Z80 processor
>>and uses
>>for main mem 8 x 4116's Drams. The value of the XTAL is 10.816Mhz.
>> When I switched on after connecting up i received an error message POD
>>TIMEOUT ATTEMPTING RESET. this error is usually a sign of bad or missing
clock
>>although it can be other faults. After much faffing about and getting
no-where
>>i decided to change the Xtal for an eight mhz one and although I cannot run
>>the game with this in it did allow me to me to get the information and by
>>doing the same to a non working board allowed me to troubleshoot and
>>repair it.
>>
>>What is going on?? is there anything I can do that would enable me to run
>>the UUT with the slower xtal as it make it difficult to know if it is
>>working properly
>>without keep changing th xtals back and forth.
>>
>>Any help would be greatly appreciated on two counts one:- to improve my
>>knowledge base 2. I now have a Magical spot doing the same but changing
>>the atal this time does not work the boards are very similar BUT.......??
>>
>>Regards Pete (invadar)
>>
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>
Received on Thu Jan 18 23:44:22 2001