GMC-4 模擬器

7-Segment Display

Address LEDs

2-pin LEDs (CAL 指令燈)

A: 0

B: 0

Y: 0

Flag: 0

PC: 00

記憶體分佈

Command Reference

Main Instructions

Code	Mnemonic	Action	Flag	Detail
0	KA	K->Ar	0, 1	Keypad to A register. Flag=1 if no key pressed.
1	AO	Ar->Op	1	Display A register.
2	CH	Ar<=>Br, Yr<=>Zr	1	Exchange A<=>B and Y<=>Z. (Not Implemented)
3	CY	Ar<=>Yr	1	Exchange A<=>Y. (Not Implemented)
4	AM	Ar->M	1	Write A to memory (addr 50+Y).
5	MA	M->Ar	1	Read from memory (addr 50+Y) to A.
6	M+	M+Ar->Ar	0, 1	Add memory to A. Flag=1 on overflow.
7	M-	M-Ar->Ar	0, 1	Subtract A from memory. Flag=1 if negative.
8	TIA [ ]	[ ]->Ar	1	Transfer immediate to A.
9	AIA [ ]	Ar+[ ]->Ar	0, 1	Add immediate to A. Flag=1 on overflow.
A	TIY [ ]	[ ]->Yr	1	Transfer immediate to Y.
B	AIY [ ]	Yr+[ ]->Yr	0, 1	Add immediate to Y. Flag=1 on overflow.
C	CIA [ ]	Ar!=[ ]?	0, 1	Compare immediate to A. Flag=1 if not equal.
D	CIY [ ]	Yr!=[ ]?	0, 1	Compare immediate to Y. Flag=1 if not equal.
E	-	-	-	Extended code (see table below).
F	JUMP [ ][ ]	JUMP	1	Jump to immediate address if Flag=1.

Extended Instructions (CAL)

Code	Mnemonic	Flag	Detail
E0	CAL RSTO	1	Clear the 7-segment readout.
E1	CAL SETR	1	Turn on 2-pin LED at index Y (0-6).
E2	CAL RSTR	1	Turn off 2-pin LED at index Y (0-6).
E4	CAL CMPL	1	Complement the A register.
E7	CAL ENDS	1	Play the End sound.
E8	CAL ERRS	1	Play the Error sound.
E9	CAL SHTS	1	Play a short sound.
EA	CAL LONS	1	Play a longer sound.
EB	CAL SUND	1	Play a note based on A register (1-E).
EC	CAL TIMR	1	Pause for (A+1) * 0.1 seconds.
ED	CAL DSPR	1	Set 2-pin LEDs from data memory (5F & 5E).
EE	CAL DEM-	1	M[Y] -= A, then Y--.
EF	CAL DEM+	1	M[Y] += A, then Y--. Handles carry to M[Y-1].