> 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.
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.
> Midway Asteroid has a "D-?" indicated and I can't tell what number it is because it > is in a folded part in which numer isn't readable.
Fortunately a working Space Race, once it happens, will solve such kind of questions.
> On the hand drawn Space Race blue print sheet, it looks as if someone wrote over in > pencil with "D" so as to prevent any confusion.
Confused am I, break taking must now I, good year wish I. *off*
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