TECH : Space Invaders 9316 Rom Replacement

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

I know this has been covered alot in the past,
(...and I did do my "Google Research" on this ),
but I'm still not 100% clear on a few things.

1- I'm trying to burn a couple of SI Eproms for someone who has
two existing 9316 ROMs, and two missing. I'm just trying to find out
which type of 2716 chips I need, TMS-2716 or Intel ?
(...most info would indicate TMS-2716 )

2- I've seen that 9316 (which had 3 CS ) could be factory-odered with
different combination of CS Enable and were thus labelled 9316A, 9316B
and 9316C. The 9316B was apparently the more commonly used.
Are there any known SI boards with 9316A or 9316C, or can one safely
assume all SI boards have 9316B ?

3- To the best of what I could find, it is not possible to install
"normal" (Intel) 2716 witout some PCB mods. So am I correct in assuming
that all Factory boards were jumpered for TMS-2716 and the only way
a game would run on Intel 2716 would be after a board mod ?

Thanks,
Steph

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

Hi Steph,
If you're going to mix 9316s and 2716s together.....DO NOT use TMS2716s. Use
Intel...or any other brand for that matter, just no TMS2716.

I believe all Midway used for Space Invaders was 9316B. Don't hold me to
this, but I've never seen or heard of any of the other versions being used.

I've seen unaltered Midway boards from the factory with all TMS2716s, all
9316B, and a mix of 9316s & regular 2716 together. If mixing regular 2716's
with 9316B's: first program the image onto your 2716. Next, bend leg 21 of
the EPROM out so it doesn't connect to anything. Lastly, jumper the bent up
pin/leg 21 to pin/leg 24. Leg 24 still connects to the pcb as usual.

Alternately, you could re-jumper the pcb to take all 2716's. About 25% of
the time, I've had regular 2716's work on a pcb jumpered for 9316B's. I
don't know why sometimes it works...sometimes it doesn't. If it doesn't
work, I re-jumper the board. If you need to re-jumper, location S2 (pin 21)
needs to go to +5 VDC. Good luck!

Edward



"HobbyRoms.Com" <info@REMOVESPAMhobbyroms.com> wrote in message
news:072dnbUA0MugbYfeRVn-2Q@rogers.com...
>
> I know this has been covered alot in the past,
> (...and I did do my "Google Research" on this ),
> but I'm still not 100% clear on a few things.
>
> 1- I'm trying to burn a couple of SI Eproms for someone who has
> two existing 9316 ROMs, and two missing. I'm just trying to find out
> which type of 2716 chips I need, TMS-2716 or Intel ?
> (...most info would indicate TMS-2716 )
>
> 2- I've seen that 9316 (which had 3 CS ) could be factory-odered with
> different combination of CS Enable and were thus labelled 9316A, 9316B and
> 9316C. The 9316B was apparently the more commonly used.
> Are there any known SI boards with 9316A or 9316C, or can one safely
> assume all SI boards have 9316B ?
>
> 3- To the best of what I could find, it is not possible to install
> "normal" (Intel) 2716 witout some PCB mods. So am I correct in assuming
> that all Factory boards were jumpered for TMS-2716 and the only way
> a game would run on Intel 2716 would be after a board mod ?
>
> Thanks,
> Steph
>

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

HobbyRoms.Com <info@removespamhobbyroms.com> wrote:
:
: I know this has been covered alot in the past,
: (...and I did do my "Google Research" on this ),
: but I'm still not 100% clear on a few things.
:
: 1- I'm trying to burn a couple of SI Eproms for someone who has
: two existing 9316 ROMs, and two missing. I'm just trying to find out
: which type of 2716 chips I need, TMS-2716 or Intel ?
: (...most info would indicate TMS-2716 )

9316 -> 2716. (just like in galaxian)

: 2- I've seen that 9316 (which had 3 CS ) could be factory-odered with
: different combination of CS Enable and were thus labelled 9316A, 9316B
: and 9316C. The 9316B was apparently the more commonly used.
: Are there any known SI boards with 9316A or 9316C, or can one safely
: assume all SI boards have 9316B ?

If you an read his 9316s as 2716s, the ones you burn should work..

: 3- To the best of what I could find, it is not possible to install
: "normal" (Intel) 2716 witout some PCB mods. So am I correct in assuming
: that all Factory boards were jumpered for TMS-2716 and the only way
: a game would run on Intel 2716 would be after a board mod ?

Changing to any other type of roms other than how the board was shipped
requires jumper changes.

--
Mark Spaeth mspaeth@mtl.mit.edu
50 Vassar St., #38.265 mspaeth@mit.edu
Cambridge, MA 02139
(617) 452-2354 http://rgvac.978.org/~mspaeth