Fluke on Universal Boards (Cosmic Alien etc.)
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) To UNSUBSCRIBE from techtoolslist, send a message with "UNSUBSCRIBE" in the message body to: techtoolslist-request@flippers.com. Please direct other questions, comments, or problems to jrr@flippers.com.
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" John :-#)# 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)
To UNSUBSCRIBE from techtoolslist, send a message with "UNSUBSCRIBE" in the message body to: techtoolslist-request@flippers.com. Please direct other questions, comments, or problems to jrr@flippers.com.
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)
To UNSUBSCRIBE from techtoolslist, send a message with "UNSUBSCRIBE" in the message body to: techtoolslist-request@flippers.com. Please direct other questions, comments, or problems to jrr@flippers.com.
participants (2)
-
John Robertson -
Peter Davies