ZX81NU - ZX81 Clone no ULA - PCB
ZX81NU Project: http://zx81.tlienhard.com/phpBB3/viewtopic.php?p=11016&hilit=ZX81NU#p11016
ZX81 Clone without ULA Chip, just with standard components
Beyond the basic ZX80/ZX81 functionality, the circuit offers:
- Up to 56KByte RAM or 80K with bank switching
- HRG graphics
- Machine programs in memory range 32K to 48K
- 32Kbyte EPROM with bank switching
- Start menu with selection ZX81 and ZX80
- Onboard interface for VDRIVE2 USB memory with driver in EPROM
Optionally assemblable and then supported by the Driver:
- 128Kbyte onboard EEPROM memory for ZX81 programs via LOAD/SAVE: "Microdisk"
- Mini-LED display for four ASCII characters
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ZX81NU Project: http://zx81.tlienhard.com/phpBB3/viewtopic.php?p=11016&hilit=ZX81NU#p11016
ZX81 Clone without ULA Chip, just with standard components
Beyond the basic ZX80/ZX81 functionality, the circuit offers:
- Up to 56KByte RAM or 80K with bank switching
- HRG graphics
- Machine programs in memory range 32K to 48K
- 32Kbyte EPROM with bank switching
- Start menu with selection ZX81 and ZX80
- Onboard interface for VDRIVE2 USB memory with driver in EPROM
Optionally assemblable and then supported by the Driver:
- 128Kbyte onboard EEPROM memory for ZX81 programs via LOAD/SAVE: "Microdisk"
- Mini-LED display for four ASCII characters