(Topic ID: 321348)

Monopoly CPU 303 ROM Checksum Error

By Gogojohnnyquack

1 year ago



Topic Stats

You

Linked Games

Topic Gallery

View topic image gallery

Capture (resized).JPG

You're currently viewing posts by Pinsider Gogojohnnyquack.
Click here to go back to viewing the entire thread.

#1 1 year ago

My Monopoly has very early ROMs (CPU 203 & DSP 203). I have the latest versions from Stern Support (CPU 303 & DSP 301). The DSP 301 checksum is correct and works in the machine, but the CPU 301 checksum is wrong and doesn't work. The CPU ROM checksum should be $5EFF but I keep getting 06D35EFF. I'm using verified blank AM27C040 ROMs.

Anyone here have ideas? Screenshot of GQ Programmer screen attached...

Capture (resized).JPGCapture (resized).JPG

#4 1 year ago
Quoted from RellikJM:

The CPU rom is on a 27C010 1 meg not a 4 meg. It may work if you fill the ROM 4 times to fill it but I’m not sure if it would work like it does works with older machines.

Thank you! The diagram in the manual shows this as a 27C040. I'm trying a 27C010...

#6 1 year ago
Quoted from RellikJM:

The CPU rom is on a 27C010 1 meg not a 4 meg. It may work if you fill the ROM 4 times to fill it but I’m not sure if it would work like it does works with older machines.

Thanks all. I don't have a 1mb and will update this when I do...

Promoted items from Pinside Marketplace and Pinside Shops!
From: $ 110.00
Playfield - Other
Arcade Upkeep
 
3,100
Machine - For Sale
Brooklyn, NY
$ 12.95
$ 30.00
Playfield - Decals
Metal-Mods
 
$ 44.99
Cabinet - Shooter Rods
Pinball Shark
 
From: $ 26.95
Lighting - Led
Mitchell Lighting
 
6,200
Machine - For Sale
Seaside, OR
3,400
Machine - For Sale
San Diego, CA
$ 10.00
Playfield - Protection
UpKick Pinball
 
5,300
Machine - For Sale
Vienna, VA
From: $ 9.99
Eproms
Matt's Basement Arcade
 
$ 1.25
Lighting - Led
Mitchell Lighting
 
$ 40.00
Playfield - Protection
UpKick Pinball
 
From: $ 30.00
$ 36.95
Eproms
Pinballrom
 
$ 18.95
Eproms
Pinballrom
 
$ 5.95
Playfield - Protection
The Pinball Scientist
 
Hey modders!
Your shop name here

You're currently viewing posts by Pinsider Gogojohnnyquack.
Click here to go back to viewing the entire thread.

Reply

Wanna join the discussion? Please sign in to reply to this topic.

Hey there! Welcome to Pinside!

Donate to Pinside

Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!


This page was printed from https://pinside.com/pinball/forum/topic/monopoly-cpu-303-rom-checksum-error?tu=Gogojohnnyquack and we tried optimising it for printing. Some page elements may have been deliberately hidden.

Scan the QR code on the left to jump to the URL this document was printed from.