ZX81
From Grahams Wiki
Contents |
[edit] Specification
- Z80 running at approx 3.25Mhz
- 1Mb of ram
- 8Mb of rom
[edit] Part list
- 3.25Mhz Z80
- 2114 1kx4 bit ram (x2)
- Custom 2364 (Similar to 2764)
- Astec UM1233 Video modulator
- zx81 ULA (2c210E)
- ZTX 313 NPN transistors.
[edit] Internals
[edit] Add ons
[edit] My mods
[edit] IO Ports
[edit] Expansion connector
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5v 9v 0v 0v Clk A0 A1 A2 A3 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 RomCs
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___ ___ ___ ___ ___ __ __ __ __ ___ ___ ___ __ ____
D7 Ram D0 D1 D2 D6 D5 D3 D4 INT NMI HLT Mem IO Rd WR Bus Wai Bus Rst M1 Rfsh
CS rq rq Ak t Rq
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