Z80 machines emulator

Usage for zx48k:

• download 48.rom from somewhere
• downlaod a TAP file
• ./zx48k --rom 48.rom --tap file.tap
• inside - do load "" (j rightshift-p rightshift-p enter)
• press 'f7' to start tape
• you can use 'f8' to start turbo mode to speed up tape load

Usage for cpc

• download CPC6128.ROM, BASIC_1.1.ROM and AMSDOS_0.5.ROM
• ./cpc --floppy floppy.dsk

Keys:

• f5 - start trace
• f6 - stop trace
• f7 - start tape
• f8 - turbo mode on/off

TODO:

• Add missing CPU ops (what happens if Z80 gets a really invalid op?)
• Do a manual z80 review - bugs are visible eg. in Jet Set Willy
• add PCM audio support
• add AY audio support
• Add kempston joystick support