midway space invaders

[vernimark]

Any idea?

Ram test
https://youtu.be/hXFsMS9gBOQ

[spectroman]

Hi marco,

you can flash my modified test rom http://www.outerworldarcade.com/arcade/space_invaders/space_invaders_test_rom.html
http://www.outerworldarcade.com/arcade/space_invaders/tst_invd.zip

and put it on H socket

[vernimark]

thank you!
I've another question.

I have 2 sound boards.
Using one sound board with a working cpu board I have no problems,
using the other sound board the game resets continuously. I can see the first game frames correctly but then resets.

[vernimark]

ok, the board reset because of the 74161 on the sound board, position D2 was faulty (reset circuit)

JUST A NOTE
some schematics invert the SOUCER HIT and the INVADER HIT sound circuits so pay attention what you are working on

[spectroman]

cool,

the 74161 is a part of the watchdog timer, I've found it faulty on some board.

[vernimark]

yep.
I bought a couple of SI Deluxe boardsets
One has the label "U.R", I'm wondering what difference has with the cocktail version

[vernimark]

you can flash my modified test rom http://www.outerworldarcade.com/arcade/space_invaders/space_invaders_test_rom.html
http://www.outerworldarcade.com/arcade/space_invaders/tst_invd.zip

Thank you. I'm working on another SI DX board and I've some questions.

- I downloaded your BINs and burned them into regular intel 2716, then I set the jumper in order to support 9316, right?
- Have I to use all 4 images or test.h only?
- Does these roms work on SI DX hardware too?

I suspect something else doesn't work because your test doesn't start.

thank you

[spectroman]

Thank you. I'm working on another SI DX board and I've some questions.

- I downloaded your BINs and burned them into regular intel 2716, then I set the jumper in order to support 9316, right?

 I use this jumper setting

- Have I to use all 4 images or test.h only?

Only the test.h is needed. But if you want to check the crc32 of the roms E F G you must install it.

- Does these roms work on SI DX hardware too?

I'll think but I haven't test it.

I suspect something else doesn't work because your test doesn't start.

With a correct jumper setting, a good clock, power supply & reset the rom should start.

[vernimark]

thank you for your answers.
probably I have a problem with my eprom programmer because after few minutes I burn the eprom it fails the verification.

anyway I decided a "brute force" approach and I replaced most of the RAMs and now the board works.

Anyway I have to repair another boardset so your test rom will be use soon