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

[John Robertson]

martin at guddler.co.uk wrote:

> 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.

How fast is the Z80 on your UUT? The regular Z80 pod is the slowest, 
there is a faster one with a Z80A, and then the fastest is the Z80QT pod.

I checked the differences between the Z80 and Z80AA pod and all I could 
see what they stuffed in the faster (Z80A) CPU!. Of course you want to 
look into the more expensive twisted pair cable for the faster CPUs as 
you may be introducing additional electronic/electrical noise into the 
system if the CPU wires are not shielded...

John :-#)#


>

> 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"

>>>

>