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Virgil Dupras 953e040231 emul/z80: add AT28 EEPROM emulator

This will facilitate the development of a solution for
cross-compiling directly to EEPROM.

2020-12-08 20:07:53 -05:00

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Z80 emulation

This folder contains a couple of tools running under the [libz80][libz80] emulator.

Requirements

You need curses to build the forth executable.

For sms and ti84 emulators, you need XCB and pkg-config.

Build

Running make builds all targets described below

Vanilla Forth

The ./forth executable here works like the one in /cvm, except that it runs under an emulated z80 machine instead of running natively. Refer to /cvm/README.md for details.

./forth doesn't try to emulate real hardware because the goal here is to facilitate "high level" development.

These apps run on imaginary hardware and use many cheats to simplify I/Os.

RC2014 emulation

This emulates a RC2014 classic with 8K of ROM, 32K of RAM and an ACIA hooked to stdin/stdout.

Run ./rc2014 /path/to/rom (for example, os.bin from RC2014's recipe). Serial I/O is hooked to stdin/stdout. CTRL+D to quit.

You can press CTRL+E to dump the whole 64K of memory into memdump.

Options:

-s replaces the ACIA with a Zilog SIO.
-e puts a 8K AT28 EEPROM at address 0x2000.
-c/path/to/image hooks up a SD card with specified contents.

Sega Master System emulator

This emulates a Sega Master system with a monochrome screen and a Genesis pad hooked to port A.

Launch the emulator with ./sms /path/to/rom (you can use the binary from the sms recipe.

This will show a window with the screen's content on it. The mappings to the pad are:

W --> Up
A --> Left
S --> Down
D --> Right
H --> A
J --> B
K --> C
L --> Start

If your ROM is configured with PS/2 keyboard input, run this emulator with the -k flag to replace SMS pad emulation with keyboard emulation.

The -c option connects a SD card in the same way as the RC2014 emulator.

In both cases (pad or keyboard), only port A emulation is supported.

Press ESC to quit.

TI-84

This emulates a TI-84+ with its screen and keyboard. This is suitable for running the ti84 recipe.

Launch the emulator with ./ti84 /path/to/rom (you can use the binary from the ti84 recipe. Use the small one, not the one having been filled to 1MB).

This will show a window with the LCD screen's content on it. Most applications, upon boot, halt after initialization and stay halted until the ON key is pressed. The ON key is mapped to the tilde (~) key.