what would case this issue?

[stutrac]

i am running a Amiga mother board with a game daughter board i have correct voltage from power supply i am thinking defective game rom? i have garbage over game image not covering game image,start up game image is perfect....

[Harrison]

Game daughter board? What is that?

And what motherboard is it? A500?

[stutrac]

the Amiga board is in a arcade game called UpScope, it runs off a amiga power supply and mother board and the game roms are on a daughter board and 3 roms are on the mother board, i found a 2nd Amiga Pcb that works halfway, all i have is 321049-01 REV 6 I will post pic of board not sure what model it is

[stutrac]

pic of game image

[Harrison]

Cool. I've known about the Up Scope arcade machine for years but never seen one.

This arcade machine is based upon an Amiga motherboard plus a specially designed EPROM daughter board which contains the game roms.

The earlier versions used an Amiga A1000 motherboard, which your one does looking at your motherboard pictures, and later ones used an A500 motherboard. So you could try a different A1000 or A500 motherboard and see if that works. I think it needs a 1.2 or 1.3 kickstart rom.

There is an arcade machine owners group with 6 members owning this machines, so one of them might be able to help you get it working correctly. The link is: http://www.arcade-museum.com/members...?klov_id=10271


Does yours look like this?

upscope2.jpg

[Harrison]

Taking with some people on another forum they have given the following ideas to test it out.

The initial thinking is like you that there could be a problem with the rom daughter board.

However you can also rule out if there is an issue with the main Amiga A1000 motherboard. If you can find a space Amiga A500 or A1000. A500's can be picked up very cheaply these days for around £10/$10. You will also need some Amiga floppy disks.

I'm assuming the arcade machine's monitor is connected to the Amiga's RGB port? If so we can use this as it is to test. First disconnect the daughterboard. Now take the floppy drive and cable from the A500 and connect it up to the A1000 motherboard. And finally boot the A1000 motherboard. If it boots correctly you should be seeing the Kickstart rom boot screen asking for a disk to be inserted. To fully test you will need some Amiga floppy games. Once you have a couple boot these up and see what happens. If you still get graphics corruption then it is a problem with the motherboard and not the daughter board. If however everything is OK then it is the daughterboard.

How does the daughterboard connect to the Amiga motherboard? Parallel port? If so you can try an A500 motherboard instead with it, but you will need a gender changer to get it to plug in.

Hope that helps.

If you need any Amiga floppy disks for testing let me know and I can do you a couple of copies and post them to you.