Zx spectrum 128k games of thrones12/13/2022 ![]() ![]() One very interesting kind of software was copiers. Higher speeds are possible using custom machine code loaders instead of the ROM routines. Assuming an even proportion of each, the resulting mean transmission rate is ~1,365 average bits/s. This allows for 1,023 'ones' or 2,047 'zeros' to be recorded per second. ![]() A 'zero' is represented by a ~244 μs pulse followed by a gap of the same duration (855 clock ticks each at 3.5 MHz) for a total ~489 μs 'one' is twice as long, totalling ~977 μs. Pulses of different widths (durations) represent 0s and 1s. Since the Spectrum has only a rudimentary tape interface, data is recorded using an unusually simple and very reliable modulation - similar to pulse-width modulation but without a constant clock rate. The software is encoded on tape as a sequence of pulses that sound similar to the noises made by a modern-day modem. Because most British home computer owners used tape instead of disk storage into the mid-1980s, most ZX Spectrum software was originally distributed on audio cassette tapes. ![]()
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