ZX80 / ZX81 for MiSTer Platform

Port of MiST version by Szombathelyi Gyorgy

Features:

• Based on Grant Searle's ZX80 page
• Selectable ZX80/ZX81
• 16k/32k/48k RAM packs
• 8KB with CHR$128/UDG addon
• QS CHRS (press F1 to enable/disable the alternative chars)
• CHROMA81
• Turbo in Slow mode: NoWait, x2, x8
• YM2149 sound chip (ZON X-81 compatible)
• Joystick types: Cursor, Sinclar, ZX81, ZXpand
• PAL/NTSC timings
• Turbo loading of .o and .p files
• Load alternative ROM.
• Load colorization and char files

Install

copy *.rbf to the root of SD card.

Tape loading

Selecting an .o (ZX80) or .p (ZX81) file opens the tape. This is indicated by the user LED. The LOAD command will load it as it would be on a standard tape. Reset (ALT-F11 or the Reset OSD option) closes the .o or .p file.

Joystick

OSD menu allows to switch joysticks between Cursor, Sinclar, ZX81. ZXpand joystick is always enabled. Other kinds of joystick will be disabled if ZXpand access is detected to avoid collisions. Only direct ZXpand joystick port is supported. $1FFE call is not supported as the ZXpand ROM is not used.

Colorization and Char files

Core supports .col and .chr files loading together with main .p file if the have the same name. For proper .col file work, CHROMA81 should be enabled before loading. For .chr file QS CHRS should be enabled before loading.

Check this site for games adapted for colors.

MiSTer binary should be updated to 20180903 or later to support .col/.chr files.

Options

ZX81 has many options and for most games, it's better to set:

• Main RAM: 16KB
• Low RAM: 8KB
• CHR$128: 128 chars
• QD CHRS: enabled
• CHROMA81: enabled

Some games may require specific settings - check the proper sites.