Zilog Z80 and Game Boy

Section alignment

Sections are not aligned to any particular multiple.

The Z80 backend supports an additional numeric literal format. The first character is the backtick:

`00112233

The values are pixel values. The values are converted from chunky data format to the planar format used by the Game Boy.

The -mg option can be used to change the four characters used for Game Boy graphic literals.

This option is used to select the CPU type. The default is Z80.

x	CPU type
g	Gameboy
z	Z80 (default)

This option enables certain synthesized instructions.

x	Synthesized instructions
0	Disabled
1	Enabled

Synthesized instructions are safe sequences with no unintended side effects. These can be used to improve readabilility of source code.

Mnemonic	Notes
LD reg16,reg16	reg16 = BC, DE or HL
LD ireg,reg16	ireg = IX or IY, reg16 = BC or DE - needs undocumented instructions enabled
LD reg16,ireg	ireg = IX or IY, reg16 = BC or DE - needs undocumented instructions enabled
LD reg16,(ireg+n8)	reg16 = BC, DE or HL, ireg = IX or IY
LD (ireg+n8),reg16	reg16 = BC, DE or HL, ireg = IX or IY
SLA reg16	reg16 = BC, DE or HL
SLL reg16	reg16 = BC, DE or HL
SRA reg16	reg16 = BC, DE or HL
SRL reg16	reg16 = BC, DE or HL