msx1fpga

MSX1 cloned in FPGA

This project is an MSX1 cloned in FPGA, with some parts of the OCM project.

Specifications:

• Multiple boards;
• MSX1 50Hz or 60Hz;
• RAM Mapper size configurable, depends on the board;
• 128K Nextor (MSX-DOS2 evolution) ROM with SD driver;
• Megaram SCC/SCC+ from OCM project (size configurable, depends on the board);
• Keyboard map reconfigurable;
• Simple switched I/O ports (no software yet);
• 15/31KHz configurable.
• Scanlines configurable.
• HDMI output on some boards.

In the project there is a loader (IPL) to boot and load ROMs and configuration from SD card.

The "CONFIG.TXT" configuration file is self-explanatory.

Use

Format an SD Card in FAT16 (max 4GB), put the NEXTOR.SYS and COMMAND2.COM files, create a directory called 'MSX1FGPA', put the CONFIG.TXT and KEYMAPs in this directory. Put ROMs and Utilities in the SD Card for MSX use. PS: Due to a Nextor bug, FAT16 partitions with ID 0x0E are not recognized, only with ID 0x06.

Some keys and their functions:

• Print Screen: Toggle VGA mode;
• Scroll Lock: Toggle Scanlines mode;
• F11: Toggle Turbo mode;
• CTRL+ALT+DEL = Soft Reset;
• CTRL+ALT+F12 = Hard Reset;
• CTRL+ALT+BACKSPACE = For ZX-Uno based boards only: reload FPGA;
• Page Down = MSX CODE key;
• Page Up = MSX SELECT key;
• ALT = MSX GRAPH key;
• END = MSX STOP key.

Uses the ROMLOAD utility for ROM loading and executing (simple, megaroms or SCC).