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| Thread ID: 96953 | 2009-01-30 02:20:00 | The Oldest PC I've Had In | pctek (84) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 743240 | 2009-01-31 06:12:00 | Wow that is old, what year model is it? I think that beats my AMSTRAD anyway. Retail price (1981) CPU Zilog Z80 at 3.25 MHz RAM 1K (16K with RAM expansion pack) ROM 8K with Sinclair BASIC Programming Language Display 64 × 48 pixels in monochrome Audio None I/O Expansion connector, cassette in/out, RF modulator out Storage Audio cassette Keyboard Membrane keyboard with keyword entry, upper case only By February 1982, Sinclair Research was making over 40,000 ZX81s a month and still could not keep up with the demand. Within two years of release, the ZX81 had sold over a million units - until it was replaced by its successor, the ZX Spectrum. The machine can be used as a calculator but there was a bug present in the original ZX81 ROM that resulted in the square root of 0.25 being calculated as 1.3591409 rather than 0.5. |
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