mirror of
https://github.com/fruit-bat/pico-zxspectrum.git
synced 2025-04-19 00:04:01 +03:00
55 lines
1.8 KiB
Markdown
55 lines
1.8 KiB
Markdown
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### ZxSpectrumPicomputerVga
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This is the target for Bobricius' Retro VGA board:<br/>
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<img src="retrovga.png" width="300"/>
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It supports the following:
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* USB keyboard
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* USB joysticks
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* Matrix keyboard (6x6)
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* VGA video (RGB332)
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* PWM sound (1 pin)
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* SPI SD card
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#### Circuit Diagram
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#### Firmware
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| Display mode | Firmware |
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| - | - |
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| 720x576x50Hz | [ZxSpectrumPicomputerVga_720x576x50Hz.uf2](/uf2-rp2040/ZxSpectrumPicomputerVga_720x576x50Hz.uf2) |
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| 640x480x60Hz | [ZxSpectrumPicomputerVga_640x480x60Hz.uf2](/uf2-rp2040/ZxSpectrumPicomputerVga_640x480x60Hz.uf2) |
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#### Keyboard mappings
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Trying to squeeze in all the key mappings is tricky but here is an attempt.
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These are the nomal key mappings:<br/>
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<img src="retro_vga_keyboard_normal.svg" width="500"/><br/>
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These are the mappings with the ALt key down.:<br/>
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<img src="retro_vga_keyboard_alt_down.svg" width="500"/><br/>
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Shifted and numeric mappings are turned on and off using the arrow keys (up, down, left, right).
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QS1, QS2, ... save the emulator state to the appropriate Quick Save slot.
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If there is a save in QS1 it will load after the emulator is powered-on or reset.
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The SN keys load snapshots as if they are in a loop.
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SN loads the current snapshot, SN- load the previous snapshot and SN+ loads the next snapshot.
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These are the mappings with the numeric shift on:<br/>
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<img src="retro_vga_keyboard_num.svg" width="500"/><br/>
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Alt+V sets the arrow keys to behave like a Kempston joystick,
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Alt+C sets the arrow keys to operate the Spectrum cursor keys.
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#### Kiosk mode
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Kiosk mode disables the menu system and quick-save buttons.
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Kiosk mode is enabled by placing the following file on the SD-card:
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```bash
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zxspectrum/kiosk.txt
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```
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#### References
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[Hackaday](https://hackaday.io/project/183398-retrovga-raspbery-pico-multi-retro-computer) |