Re: New Space Wars Rom info

Gang,

Looking through some other Cinematronics manuals I believe these roms could be either

Signetics 82S2708 Bi-polar proms - where pin 20 is CE (so this should be held
high on a 2708 right?) - also the number on my proms is 7820... kinda close... right?

or a: Phillips 82S181 - where the odd pinouts are:
21 = CE1
20 = CE2
19 = CE3
18 = CE4

on the pinout CE1 and CE2 is labelled as high. I have no idea what to do with this.

While I play... any ideas?

Cheers
MacMan

Paul Sommers wrote:
>
> Gang,
>
> Thanks for all the help so far - but tying pin 21 to high doesn't have any
> effect. I haven't tried Peter's adaptor yet because I'm not sure what masked
> roms I have.
>
> I am using the Star Hawks schematics because the Space War Schematics (apart
> from wiring and sound) are not on-line. Star Hawks runs on a rev B boardset so
> it SHOULD be the same.
>
> The schematic lists the roms as 2616 - a part I can't find at freetradezone.
>
> Here is a snip from Steve O's FAQ:
>
> The actual Cinematronics boards do have wiring modifications (for an unused
> gate) for boards using 2716s vs. 2732s, but this only involves adding wires
> to use an extra gate for addressing the larger address space in a 2732
>
> There are no jumpers so they obvioulsy are 2716 compatible. It's just working
> out the masking. The following is also from the FAQ:
>
> The markings on the
> masked ROMS are as follows (note that the markings from three different sets
> of Space Wars boards are below....their are only two masked ROMS per board):
>
> BOARD SET #1: SPACE WARS C1977 SPACE WARS C1977
> 'S' 7825 2147 and 'S' 7823 2148
>
> BOARD SET #2: 'S' 8204 'S' 7818
> C28277M and 2148
> 2147 SPACE WARS
> COPYRIGHT 1977
>
> BOARD SET #3: 'S' 7825E<-----?E? 'S' 7819D
> C28277M and C28276M
> 2147 2148
> ^---this one chip
> in set #3 was
> in a socket
>
> My set is the third set but the chip # is 7820D which is different to all of
> these. I hoping the additional part numbers could help you narrow down exactly
> what masked roms I have and how I can wire a 2716 to fit.
>
> All help is greatly appreciated. These beasts are rare in Australia - and I
> mean RARE!
>
> Thanks
> Paul
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Received on Tue Feb 6 06:33:01 2001