3581beace0
The buffer's implementation wasn't buying us much in exchange for its complexity. A modern machine was still too fast for it (copy/pasting text from a modern machine would send bytes too fast for the RC2014) and in the (theoretical so far) case of COS-to-COS communication, the buffer didn't help in cases where the baud rate was faster than the processing of each byte received (for example, if the byte was written directly to EEPROM). I'm scrapping it and, instead, use the RTS flag to signal the other side when we're ready to receive a new byte. Also, implement driver for channel B in SIO. I will need it to talk to my TRS-80 4P. |
||
|---|---|---|
| .. | ||
| .gitignore | ||
| Makefile | ||
| README.md | ||
| acia.c | ||
| acia.h | ||
| at28.c | ||
| at28.h | ||
| emul.c | ||
| emul.h | ||
| forth.c | ||
| opcodes_decl.h | ||
| opcodes_impl.c | ||
| opcodes_table.h | ||
| ps2_kbd.c | ||
| ps2_kbd.h | ||
| rc2014.c | ||
| rc2014_spi.c | ||
| rc2014_spi.h | ||
| sdc.c | ||
| sdc.h | ||
| sio.c | ||
| sio.h | ||
| sms.c | ||
| sms_pad.c | ||
| sms_pad.h | ||
| sms_ports.c | ||
| sms_ports.h | ||
| sms_spi.c | ||
| sms_spi.h | ||
| sms_vdp.c | ||
| sms_vdp.h | ||
| t6a04.c | ||
| t6a04.h | ||
| ti84.c | ||
| ti84_kbd.c | ||
| ti84_kbd.h | ||
| tms9918.c | ||
| tms9918.h | ||
| trs80.c | ||
| xcomp.fs | ||
| z80.c | ||
| z80.h | ||
README.md
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:
-sreplaces the ACIA with a Zilog SIO.-eputs a 8K AT28 EEPROM at address0x2000.-c/path/to/imagehooks 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.
Press ESC to quit.
As for the rest of the mappings, they map at the key level. For example, the 'Y' key maps to '1' (which yields 'y' when in alpha mode). Therefore, '1' and 'Y' map to the same calculator key. Backspace maps to DEL.
Left Shift maps to 2nd. Left Ctrl maps to Alpha. [libz80]: https://github.com/ggambetta/libz80