Platform SMC 777

Hardware summary

• Z80 @ 4.028 Mhz
• 32k ROM (SMC-70) 16k ROM (SMC-777)
• 64k RAM
• MC6845
• 32k VRAM
• SN76489 (SMC-777)
• 2 joysticks (port 0x051 and 0x151)

This port is under development

As well as producing native binaries, this machine can run both CP/M and S-OS and hence applications compiled for either OS will work. The target specific library can be used under either OS but testing has mostly taken place under CP/M.

Classic library support

• Native console output
• Native console input
• ANSI vt100 engine
• Generic console
  • Redefinable font
  • UDG support
• 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 (CP/M)
• Interrupts
• RS232

Compilation

zcc +smc777 file.c -create-app

Will generate a disc that can be booted by the IPL. In this mode, the application can use all the memory within the machine.

Generating a CP/M binary provides more functionality such as file handling:

zcc +cpm file.c -subtype=smc777 -create-app

This command will create a .dsk image suitable for use in emulators.

Emulators

The target has been tested using the Takeda emulator.

Graphics support

The following screen modes are available:

• Mode 0: 80x25, 160x50 lores graphics
• Mode 1: 40x25, 80x50 lores graphics
• Mode 4: 80x25, 320x200 hires graphics
• Mode 5: 40x25, 320x200 hires graphics
• Mode 8: 80x25, 640x200 hires graphics
• Mode 9: 40x25, 640x200 hires graphics

The hires graphics plane is separate to the text plane. As a result graphics are overlaid by any text printed. The background colour of the hires graphics plane can be configured using the textbackground() function.

Links

• Takeda Emulator
• Technical details on z88dk issue