F8 Opcode Map

Introduction

The row is the high nibble of the opcode and the column the low nibble. In the rows 3, 4, 5, C, D, E and F the low nibble is a scratchpad register designator (0 to 11, S, I, D and the undefined 15); in rows 6 and 7 it holds the value; in rows A and B the port. A cell shows the instruction. The undefined opcodes are shaded.

The map

	x0	x1	x2	x3	x4	x5	x6	x7	x8	x9	xA	xB	xC	xD	xE	xF
0x	LR A,DPCHR	LR A,DPCHR	LR A,DPCHR	LR A,DPCHR	LR DPCHR,A	LR DPCHR,A	LR DPCHR,A	LR DPCHR,A	LR K,P	LR P,K	LR A,IS	LR IS,A	PK	LR P0,Q	LR Q,DC	LR DC,Q
1x	LR DC,H	LR H,DC	SR 1	SL 1	SR 4	SL 4	LM	ST	COM	LNK	DI	EI	POP	LR W,J	LR J,W	INC
2x	LI	NI	OI	XI	AI	CI	IN	OUT	PI	JMP	DCI	NOP	XDC	-	-	-
3x	DS	DS	DS	DS	DS	DS	DS	DS	DS	DS	DS	DS	DS	DS	DS	DS
4x	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r	LR A,r
5x	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A	LR r,A
6x	LISU	LISU	LISU	LISU	LISU	LISU	LISU	LISU	LISL	LISL	LISL	LISL	LISL	LISL	LISL	LISL
7x	LIS	LIS	LIS	LIS	LIS	LIS	LIS	LIS	LIS	LIS	LIS	LIS	LIS	LIS	LIS	LIS
8x	BT	BT	BT	BT	BT	BT	BT	BT	AM	AMD	NM	OM	XM	CM	ADC	BR7
9x	BF	BF	BF	BF	BF	BF	BF	BF	BF	BF	BF	BF	BF	BF	BF	BF
Ax	INS	INS	INS	INS	INS	INS	INS	INS	INS	INS	INS	INS	INS	INS	INS	INS
Bx	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS	OUTS
Cx	AS	AS	AS	AS	AS	AS	AS	AS	AS	AS	AS	AS	AS	AS	AS	AS
Dx	ASD	ASD	ASD	ASD	ASD	ASD	ASD	ASD	ASD	ASD	ASD	ASD	ASD	ASD	ASD	ASD
Ex	XS	XS	XS	XS	XS	XS	XS	XS	XS	XS	XS	XS	XS	XS	XS	XS
Fx	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS

The undefined opcodes

Opcodes 2D, 2E and 2F have no instruction in the tables read. The explorer shows each as a one-byte DB with the status Illegal; what a real chip does is not documented in the sources read (the Channel F core read executes them as a four-clock no-operation). Opcode 0E, which one table marks undefined, is LR Q,DC in the instruction list of the same site, in the debugger decoder and in the core.

Not described

Known, not yet covered

Reference: the F8 variants with extra instructions (the Mostek 3870 family and later F8 parts).

Unknown

Reference: the behaviour of 2D to 2F and of the designator 15 opcodes (marked undocumented, shaded) on real chips.

F8 Instruction Set – Opcode map