[Techtoolslist] Fluke 9100/6800pod and bally mpu help needed.

[martin at guddler.co.uk]

Hi Steve,

While a PITA, I don't think it's too uncommon. I have a Z80 based  
board on the bench right now that will do all the usual  
troubleshooting stuff and now I've fixed it, work with a normal CPU,  
however the run UUT simply won't do squat.

Martin.

On 7 Oct 2008, at 20:11, <mail at nessandsteve.plus.com> <mail at nessandsteve.plus.com 
 > wrote:


> Thanks John,

> I tried what you and Corey have kindly suggested. From this I found  

> 58e1 to be the start location. When I try starting from this  

> location it still wont boot so I guess as Macro has pointed out it  

> may just be hard luck.

> It is a 9100ft that I am using and when I view the boot rom  

> everything prior to location 5800 is FF so I tried starting at 5800  

> as well but still no go.

> Shame as I wanted to write a program specific to the bally MPU.

> But at least the mpu board works with a real CPU in it now.

>

> Thanks everyone for your help.

> Steve

>

> ----- Original Message ----- From: "John Robertson" <jrr at flippers.com>

> To: "Technical Tools Mail List" <techtoolslist at flippers.com>

> Sent: Monday, October 06, 2008 5:11 PM

> Subject: Re: [Techtoolslist] Fluke 9100/6800pod and bally mpu help  

> needed.

>

>

>> mail at nessandsteve.plus.com wrote:

>>> Hello all,

>>> I am hoping someone can help me out. Let me start by describing  

>>> what has

>>> lead me to this:

>>> I receive a Bally MPU board P# r2518-35 (Star Trek) that needs

>>> repairing.

>>> I hook up the fluke and boot it up and get a bad clock error.

>>> I notice someone has replaced the 74s37 with a 74LS00, so replcing  

>>> it

>>> restores the clock.

>>> I "Run UUT" and the status LED stays on.

>>> I check the jumpers and find that 2 are wired incorrectly so I set

>>> them right and and I still get nothing.

>>> After much head scratching and checking various things with a  

>>> scope I

>>> couldn't see a problem.

>>> I replace the cpu and its socket with a spare and it starts the self

>>> test process.

>>> I continue on and it gets snagged on each step so replacing the

>>> sockets on the RAM and PIA at U8 and U11 gets me to the second to  

>>> last

>>> test which failed due to a broken lead on c16. Replacing restored it

>>> to fully working.

>>>

>>> So the MPU board is now completetly working on the bench but if I  

>>> use

>>> my fluke it will not start the self test process.

>>> I have tried starting the "Run UUT" from address $1000 and $5000  

>>> as I

>>> believe this to be the address for each ROM but still nothing.

>>>

>>> Just to be sure it was not a pod failure I tried a NOS one from the

>>> shelf and got the same effect. (Both pods pass self test)

>>>

>>> Can someone point out something really obvious?

>>>

>>> Cheers

>>> Steve

>>>

>>>

>> "Run UUT" requires you to either accept the default boot location  

>> (recommended!) or enter it by hand.

>>

>> Your choices (1000h or 5000h) are not the boot location the CPU is  

>> looking for in the ROM code, if I remember correctly the boot  

>> location for a 6800 is something like FFFEh or FFFCh - its in the  

>> manufacturers guide to the CPU in question.

>>

>> Best to simply power down the UUT, then power down the 9010, then  

>> power the 9010 back up and then the UUT and then do the "Run UUT"  

>> and press "Enter" twice without adding anything else. Should work  

>> if it works for the original CPU.

>>

>> John :-#)#

>>

>> -- 

>> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call  

>> (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)

>>                www.flippers.com "Old pinballers never die, they  

>> just flip out"

>>

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