ID an IC marked as 5471 20pin

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It is a 20 pin IC and probably some kind of buffer. It is at location H2 and
F8 on an Astro Battle PCB Sidam. The IC's are missing but marked on the
Schematic as 5471. Any ideas? 1 is between the data bus and the program
memory and the other is in the final stage of the video output
 
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CAPS comes up empty. Could it be a custom? You might try seeing if it's
pin-compatible with a popular PROM.

- Craig
 
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Definitively proms.
The game has been added to a recently version of mame, look there to
get the dumps.
 
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Sounds like some sort of memory. (A)ddress, (Data), and (E)nable. I'd
put money on a masked ROM.

- Craig
 
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Its a copy of astro fighter Schems show pins A0 to A7 D0 to D7 and E1 E2
<aminotti@gammaproinfo.it> wrote in message
news:1121171973.477706.308030@g43g2000cwa.googlegroups.com...
> Definitively proms.
> The game has been added to a recently version of mame, look there to
> get the dumps.
>
 
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simon hanlon <simonjhanlon@btopenworld.com> wrote:
: It is a 20 pin IC and probably some kind of buffer. It is at location H2 and
: F8 on an Astro Battle PCB Sidam. The IC's are missing but marked on the
: Schematic as 5471. Any ideas? 1 is between the data bus and the program
: memory and the other is in the final stage of the video output

54xx is usually just the military version of 74xx.

7471 is a j-k flipflop with a gated preset...

May or may not be what you need...

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

i think it must be a prom i will scan the schem and let you take a look. the
sockets suggest a prom
"Mark C. Spaeth" <mspaeth@plancherel.mit.edu> wrote in message
news:42d3eb22$0$570$b45e6eb0@senator-bedfellow.mit.edu...
> simon hanlon <simonjhanlon@btopenworld.com> wrote:
> : It is a 20 pin IC and probably some kind of buffer. It is at location H2
> and
> : F8 on an Astro Battle PCB Sidam. The IC's are missing but marked on the
> : Schematic as 5471. Any ideas? 1 is between the data bus and the program
> : memory and the other is in the final stage of the video output
>
> 54xx is usually just the military version of 74xx.
>
> 7471 is a j-k flipflop with a gated preset...
>
> May or may not be what you need...
>
> --
> 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
>
 
V

Vaxx

Distinguished
Jun 9, 2004
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Archived from groups: rec.games.video.arcade.collecting (More info?)

FYI, Sidam had licenses from a lot of companies to produce there pcb's. I
have a sidam Galaga pcb (better quality IMHO) that is an exact copy of a
Namco pcb. Do you know what the game is a copy of?


"simon hanlon" <simonjhanlon@btopenworld.com> wrote in message
news:db05tp$tc5$1@newsg3.svr.pol.co.uk...
> It is a 20 pin IC and probably some kind of buffer. It is at location H2
and
> F8 on an Astro Battle PCB Sidam. The IC's are missing but marked on the
> Schematic as 5471. Any ideas? 1 is between the data bus and the program
> memory and the other is in the final stage of the video output
>
>
 
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