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ZXPAND+ adds 32k RAM / SD Card Storage / AY Sound / Joystick to your ZX81 | eBay
I designed a miniature cassette replacement device useable with my ZX81+38, or a Spectrum. called TZXDuino-pico - Raspberry Pi Forums
The Sinclair ZX81: a Raspberry Pi retro restyle – Part 2 | smittytone messes with micros
The Best Portable Spectrum - Alan Pope's blog
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I designed a miniature cassette replacement device useable with my ZX81+38, or a Spectrum. called TZXDuino-pico - Raspberry Pi Forums
ZX81 - Wikipedia
Reviving a Sinclair ZX81 Program from a Decades-Old Magnetic Tape: A Python Adventure | by Tony Gillett | Medium
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ZX81 using AVR | Digital Fanatics
Single Chip Sinclair ZX81 Spectrum Computer ATmega1284P. - YouTube
Reviving a Sinclair ZX81 Program from a Decades-Old Magnetic Tape: A Python Adventure | by Tony Gillett | Medium
Retrostuff/SD81-Booster: ZX81 interface card with microSD loading/saving, 512 KB RAM, AY sound and speech support - Codeberg.org
Zon ZX-81 Programmable Sound Generator expansion for ZX81PLUS35 with working SD-Card - RevSpace
Sinclair ZX81 System Story - Nostalgia Nerd
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Zx81 zxpand very rare sound and sd adapter built in monitor | eBay
Tynemouth Software: Minstrel ZX80 Clone and the ZXpand
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zx81 48k memory. - Sinclair ZX80 / ZX81 / Z88 Forums
