Hardware summary

• Z80 @ 3.57Mhz
• 2k RAM
• AY8910
• VDP: TMS9928, 16k VRAM

Classic library support (+myvision)

• Native console output
• Native console input
• ANSI vt100 engine
• Generic console
  • Redefinable font
  • UDG support
  • Paper colour
  • Ink colour
  • Inverse attribute
  • Bold attribute
  • Underline attribute
• Lores graphics
• Hires graphics
• PSG sound
  • ETracker (SAA tracker)
  • PSG Lib (SN76489)
  • Arkos2 Player (AY)
  • WYZ Player (AY)
  • Vortex tracker (AY)
• One bit sound
• Inkey driver
• Hardware joystick
• File I/O
• Interrupts
• RS232

Compilation

zcc +myvision program.c -create-app

A 24k ROM file will generated which can be loaded into mame using the following command line:

mame myvision -cart program.rom

Keyboard and Joystick handling

The keyboard on this console is arranged as follows:

                       B
                  A          D    E
                       C
  1 2 3 4 5 6 7 8 9 10 11 12 13   14

These are mapped into the following keycodes (hex) returned by fgetc_cons():

                       11
                  08         09    45
                       10
  31 32 33 44 55 36 37 38 39 14 15 16 17   18

Joystick 1 uses keys A,B,C,D,E,10, joystick 2 uses keys 1,2,3,4,5,6

Additional library

The VDP used by the MyVision is the same as the one in the MSX, as such many MSX examples will work. However, the machine is not particularly well equipped with memory so care must be taken.

You can reduce RAM usage by making static data const where possible - this will keep it ROM rather than copying to RAM.

Links

• Mame emulator