Re: Paged memory sound boards...

<x-flowed>Yes, that is the next step...fortunate are we that there exists a
Signature Generator! Many thanks to James Bright for that!

http://www.quarterarcade.com/Fluke/FIDE.aspx

Just need to break the 64K chunks of code into 2K (might be 4 or even
8K chunks the schematics are at the shop) chunks and check their
signatures...now where is that ROM splitter program?

John :-#)#

At 11:23 PM -0800 2/22/05, Tony Gonzalez wrote:
>For page flipping, find the page register and change
>the page number, then do the signature on each bank,
>perhaps?
>
>Tony
>
>
>
>
>--- John Robertson <jrr@flippers.com> wrote:
>
>> Gah, there are days when I wish I fixed simple
>> things, like rocket engines...
>>
>> Currently I'm trying to figure out how to test a
>> Williams sound board
>> that uses a 6809E with 172K of paged ROM memory
>> (address bit toggled)
>> that is working only with some lower size ROMs, but
>> not with the
>> program memory (verified!) for the particular game -
>> Riverboat
>> Gambler. Bloodly black magic sound boards if you ask
>> me!
>>
>> So, the sound board (D-11578 I think is the number)
>> will work with
>> Police Force sound ROMs (27256) installed, but not
>> with either
>> Whirlwind or Riverboat Gambler (27512) ROM
>> installed. Jumpers are
>> correct, no defective sockets, RAM is good, can
>> select the individual
>> ROMs with the 6809E pod. However I don't get the
>> Reset BONG
>> noise...except two separate times:
>>
>> The first time was when I had placed my Bugtrap
>> Logic Comparator on
>> the 74LS175 (ROM select logic) - then the sounds
>> worked properly!
>> However when I replaced the suspect 175, no sounds,
>> and when I put
>> the original 175 back in the (now socketed) PCB, I
>> don't get the
>> sounds even with the Bugtrap the same way.
>>
>> The second time I got a Reset BONG repeatedly when I
>> first tried the
>> 6809E pod on my 9010 - did RAM tests, BUS tests,
>> etc, then tried RUN
>> UUT - then shorted the PCB Reset line and BONG! And
>> again (Reset)
>> BONG (Reset) BONG...sigh, checked original CPU back
>> in socket - no
>> BONG, put 6809E pod back in - no BONG!!! ARGHHHHH...
>>
>> Checked BUS - fine, voltages - fine, pullups - all
>> fine, socket
>> connections to ICs fine....I'm missing SOMETHING!
>> Pulled out
>> Motorola's data book in the off chance that Williams
>> engineers missed
>> something special about pullups on unused lines -
>> nothing so
>> far...(this was the case on Game Plan MPUs about the
>> Z80! nasty bit
>> of bad design there.)
>>
>> I think this board is going to become a frisbee!
>>
>> John :-#(#
>>
>> PS, remind me to fix the description line on the
>> email reply...
>>
>> --
>> 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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>
>
>
>
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-- 
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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