Spectrum ZX 48K emulator (using STM32F407 microcontroller)
- Emulate Spectrum ZX 48K
- Load snapshot in .Z80 format from SD card
- Save snapshot in .Z80 format to SD card
- Output some sounds to USB MIDI
Video
If you want to try my project, this is the only part that you need.
| Hardware | Qty |
|---|---|
| Black F407VET6 board | 1 |
| VGA connector | 1 |
| PS/2 Keyboard | 1 |
| Power supply 5V DC for keyboard | 1 |
| Resistors 470 Ohm | 3 |
| Resistors 680 Ohm | 3 |
| Resistors 2.2 KOhm | 2 |
| Resistors 3.3 KOhm | 2 |
| Breadboard | 1 |
| Jumper wires | 18 |
| ST-Link v2 or clone | 1 |
Software: Install free IDE STM32CubeIDE. I am using Windows 10, however STMicroelectronics claims that it also supports Linux and Mac.
How to connect wires:
| PIN | Description | Connect To | Output |
|---|---|---|---|
| PE8 | Red 1 | Resistor 470 Ohm | VGA red (1) |
| PE9 | Red 2 | Resistor 680 Ohm | VGA red (1) |
| PE10 | Green 1 | Resistor 470 Ohm | VGA green (2) |
| PE11 | Green 2 | Resistor 680 Ohm | VGA green (2) |
| PE12 | Blue 1 | Resistor 470 Ohm | VGA blue (3) |
| PE13 | Blue 2 | Resistor 680 Ohm | VGA blue (3) |
| PD15 | HSync | VGA HSync (13) | |
| PD14 | VSync | VGA VSync (14) | |
| PB14 | CLK | Resistor 2K2 to keyboard CLK and resistor 3K3 to GND | |
| PB13 | DATA | Resistor 2K2 to keyboard DATA and resistor 3K3 to GND | |
| G | Ground | VGA Ground (5,6,7,8,10), '-' of passive speaker |
This project uses several libraries (in addition to HAL drivers from STMicroelectronics):
- To display video using VGA: https://github.com/cbiffle/m4vgalib (which requires https://github.com/cbiffle/etl)
- Z80 emulator: https://github.com/anotherlin/z80emu
- FATFS for SD card: http://elm-chan.org/fsw/ff/00index_e.html
- Interference when using SD card or playing sound
- Flickering in some games
- The speed is 12% faster than it is supposed to be