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78 lines
3.4 KiB
Markdown
78 lines
3.4 KiB
Markdown
## ZX-UNO.1010
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10x10cm PCB variant of ZX-Uno project
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[](images/README.md)
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[](images/README.md)
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[[More photos]](images/README.md)
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Tech specs:
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- Fully compatible with ZX Uno v4.1 and ZX-Uno VGA 2M
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- XC6SLX9 FPGA
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- 2Mb SRAM memory
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- VGA video output
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- PAL/NTSC video + audio output via 3.5 jack connector (raspberry-pi compatible pinout)
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- PS/2 keyboard and mouse ports
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- 2xDB-9 ports for Atari-compatible joysticks
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- SD/microSD card slot
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- Tape input via Bluetooth module or ordinary 3.5 jack
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- MIDI
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- WiFi module
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- RTC (starting from rev.B)
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- Type C (starting from rev.D) or MicroUSB power supply
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- Board optimized for G738 and G706 cases
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FAQ on official site: [link](https://uto.speccy.org/zxunofaq_en.html)
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Some random photos: [link](https://cloud.err200.net/index.php/s/73TR85tYZkMm8Ax?path=%2Fzxuno1010)
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### Changelog
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* Rev.A - first release ([main pcb errata](pcb/rev.A/ERRATA.txt) and [covers errata](pcb_covers/rev.A/ERRATA.txt)).
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* Rev.A1 - fixes all known issues of rev.A.
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* Rev.B:
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* added RTC
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* changed second joystick port wiring - in rev.A it's has been wired like in ZXUNO-VGA2M, but now it's wired like Joysplitter, which is officially supported way
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* joysticks are now powered by +5V rail instead of +3.3V - this should improve compatibility with various RF gamepads
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* optimized SAM2695 footprint for hand soldering
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* added opamp for proper MIDI sound mixing
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* added buffer in DAC circuit
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* added separate LDO for SD card and WiFi module
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* added resistor between WiFi's GPIO15 and GND to prevent IC heating
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* remove beeper (which wasn't used anyway)
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* improved power distribution for FPGA chip
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* pcb corners are rounded now
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* experimental tape-in circuit
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* Rev.C:
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* added dedicated LDO for audio to improve noise floor
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* added optional capacitor for NTSC quartz stability
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* added missing decoupling capacitor on RTC power rail
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* added current-limiting resistors after opamp on sound output
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* changed R76, R80 from 10kΩ to 8.2kΩ
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* changed U10 opamp from NE5532 to LMV358 as it better suited for low-voltage operation
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* 3mm front leds replaced by 5mm
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* experimental reset circuit based on MAX809
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* reverted to old tape-in circuit
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* Rev.D:
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* used USB Type C instead of Micro USB
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* PJ-320 3.5mm jack replaced by PJ-322
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* added solder jumper to select 3.5mm jack CVBS pinout
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* MIDI synthesizer U6 uses clean analog power rail now
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* improved W25Q128 footprint to able to install IC in WSON package
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* some minor PCB layout changes to reduce WiFi interference
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* reverted to old reset circuit
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* Rev.D1:
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* changed R16 from 220Ω to 1kΩ to reduce power led bightness
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* changed R70, R71 from 10kΩ to 12kΩ to improve balance with AY
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* changed C51 from 100nF to 1uF to improve audio noise floor
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* changed C13 value as some quartz failed to start with 4.3pF load
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* changed U17 from LP2985-3.3 to TPS7A2033PDBVR due to better PSRR
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* changed U15 from 74LVC2G34 to 74LVC2G04 as it's more common in my projects
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### References
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* ZX Uno official site: [link](https://zxuno.speccy.org/index_e.shtml)
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* ZX Uno VGA 2M: [link](https://github.com/ManuFerHi/ZXUNO_VGA_2M)
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* Great collection of cores, games and much stuff for ZX Uno: [link](https://www.zxuno.com/forum/viewtopic.php?f=27&t=4142), [in english](https://www-zxuno-com.translate.goog/forum/viewtopic.php?f=27&t=4142&_x_tr_sl=es&_x_tr_tl=en)
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