5 ms·
One of which was custom designed (an ULA) for the ZX81. The ZX80 used 21 (IIRC) off-the-shelf TTL chips.
by fred256 7y ago
One of which was custom designed (an ULA) for the ZX81.
The ZX80 used 21 (IIRC) off-the-shelf TTL chips.
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