Tech: Space Invader rom strapping info

[blinddog]

That looks like it should work for S2 S3 and S5. Do you restrap S6 also? If you were previously running 2708s you will need to change them too. Also if you have the tantalum caps in between the rom sockets then they will need to be removed

 

[steph]

That looks like it should work for S2 S3 and S5. Do you restrap S6 also? If you were previously running 2708s you will need to change them too. Also if you have the tantalum caps in between the rom sockets then they will need to be removed

I think you can probably assume that any version of Seawolf that had 4 roms chips,
is running 1024bytes x 8 bits (8K bits) chips.

If you are replacing with 2716 eproms, those are 2048bytes x 8 bits (16K bits).
[... of which you only need two eproms since they are twice the capacity of the older proms]

So yes, the jumpers at S6 will need to be changed.

I'm including a picture of the S6 jumper changes, as well as the cap that needs to be removed.

NOTE : This is based on info I've gathered on-line ! I have not done these changes myself.
Could anyone with proven knowledge of this, kindly confirm my statement ?

thanks,
Steph