Scans of adverts for ZX81 Software & Hardware Links to Various ZX81 Emulators Over 1000 P files to use with the emulators.Virtually every game/utility including classic's like 3d Monster Maze & ZX-Galaxians Pictures of the machine itself and various hardware Scans of Tape Inlays Technical Specifications and circuit diagrams. ZX81 Technical Specifications. CPU: Z80A at 3.5 MHz ROM: 8 Kbytes RAM (expandable) 1 (16) KByte Display: TV  Text display: 32*15 Graphics display: 64 *44 Colours: black and white Sound: none! Keyboard: Touch Sensitive membrane keyboard Interface: Expansion Bus Data Storage: Cassette Based via Earphone & Microphone 3.5mm Connection Power Supply: External 9v DC power pack

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