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gregf |
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Ramtek's Trivia promoter
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Reged: 09/21/03
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Posts: 8603
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Loc: southern CA, US
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Space Race / Asteroid paperwork comparisons 555 and 566
01/03/10 09:43 AM
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> btw: I noticed a couple of odd differences between Asteroid General Instructions
> versus Asteroid logic schematics. And it looks as though the hand drawn Space Race
> blue print sheets have 566 being used instead of NE 555, but that was probably before
> Space Race pcbs were in full production and placed into Space Race cabs.
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> Hold on! The 555 and 566 are completely different parts, even if both have the same
> package (8 pin DIP) and power pins (8 and 1). The 566 is a voltage controllable
> oscillator while the 555 can be used as mono-flop or rate generator, depending on the
> external circuitry.
I messed up and got part numbers incorrect. 566 is audio related. My bad.
I did a comparison with all Space Race / Asteroid paperwork on hand.
One trouble shooting attachment by itself....maybe a preliminary print?
A-3 NE 555
A-4 NE 555
A-6 NE 555
A-9 NE 555
B-4 NE 555
C-4 NE 555
C-9 NE 555
D-9 NE 555
These look more reliable imo.
General instructions with troubleshooting section and parts layout page
A-3 NE 555
A-4 NE 555 <-- is printed, but parts layout and logic schematics have 566.
A-6 NE 566
A-9 NE 555
B-4 NE 566
B-6 NE 555
C-4 NE 566
C-9 NE 555
D-9 NE 555
Midway Asteroid logic schematics
A-3 NE 555
A-4 NE 566
A-6 NE 555
A-9 NE 555
B-4 NE 566
B-6 NE 555
C-4 NE 566
C-9 NE 555
D-9 NE 555
Atari Space Race hand drawn logic schematics
A-3 NE 555
A-4 NE 566
A-6 NE 555
A-9 NE 555
B-4 NE 566
B-6 NE 555
C-4 NE 566
C-9 NE 555
D-9 NE 555
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Space Race / Asteroid paperwork comparisons 555 and 566
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Re: Senseless connection?
