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== Architecture == * '''CPU''' β Z80A-class microprocessor clocked at '''3.25 MHz'''. * '''ROM''' β 8 KB mask ROM containing Sinclair BASIC and system routines. * '''RAM''' β 1 KB of 2114 static RAM, expandable to 16 KB via the rear expansion bus. * '''Logic''' β Utilizes standard TTL logic chips, with no custom chips. === Video generation === The ZX81 generates video output using the Z80 processor, which produces a sync pulse and fetches character data from RAM. The video output is interleaved with CPU operations, which can lead to display flicker during intensive processing.
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