Platform Alphatronic PC - marinus-lab/z88dk GitHub Wiki

Hardware summary

Z80 @ 4 Mhz
64k RAM, 24k ROM + 4k chargen
HD46505SP (aka mc6845) as CRTC

Compilation

zcc +alphatro world.c -create-app

The resulting .rom file can be loaded into MAME and run as follows:

mame64 alphatro -cartridge1 a.rom

CP/M mode

zcc  +cpm -lm -create-app -subtype=alphatro -oPROGRAM program.c

The resulting .imd file is a valid disk image for both the Xbeaver and MAME emulators.

Generic console and graphics modes

The Alphatronic PC supports 40 and 80 column modes and the corresponding lores graphical. You can switch modes using console_ioctl() with the following mode values:

Mode 0: 40x24 text, 80x48 graphics
Mode 1: 80x24 text, 160x48 graphics

Colour is supported in both modes.

Screenshots

Running the VT52/generic console test program:

Emulator hints

Xbeaver

xbeaver_SDL matmos.cfg

Example on how to alter matmos.cfg:

board 0xf0 aptflp -geometry 40.2.16.1.256 cpm.img  -geometry 40.2.16.1.256  a.imd

MAME

mame alphatro -flop1 cpm.imd -flop2 a.imd

External tools

It is possible to use the original IMD tools to manually convert a RAW disk image to a valid IMD file and vice versa.

An MSDOS emulator is required (even a simple wrapper at command line level).

BIN2IMD.COM /2 N=40 SS=256 SM=1-16 DM=4 a.raw a.imd


IMDU.COM /B a.imd a.raw

Limitations

Although the machine has 64k RAM, only 16k cartridges can be generated