Features
- 4 16-bit Registers
- 254 8-bit Flag Registers
- Start at end of memory from 0xFF00
- See FLAGS.md
- 255 8-bit Ports
- 0x00 console in/out
- 0x01 tape in/out
- 0x02-0x20 Reserved
- Others Implementation Specific
- 255 Syscall routines
- Program Counter
- Call Stack 16 x 16-bit
- 64K x 8-bit Memory
- MSB / big-endian
ASM Parameters
| Type |
Symbol |
Example/Use |
| Registers |
R |
A-D |
| Marker |
: |
:XYZ |
| Absolute Location |
# |
0-65535 | 0xFFFF |
Location Parameter (@)
| Code |
ASM |
Type |
Values |
| 0x0 |
P |
Port |
0-255 | 0xFF |
| 0x1 |
R |
Register |
A-D |
| 0x2 |
M |
Memory |
0-65535 | 0xFFFF |
| 0x3 |
L |
Immediate |
0-65535 | 0xFFFF | 'a' | "a" |
| 0x4 |
A |
Address In Register |
A-D |
ASM Instructions
| Hex |
ASM |
Parameters |
Notes |
| Misc |
|
|
|
| 0x00 |
NOP |
|
|
| Load/Save |
|
|
|
| 0x10 |
LOAD |
[R] [@] |
|
| 0x11 |
SAVE |
[R] [@] |
|
| 0x12 |
LOADH |
[R] [@] |
|
| 0x13 |
LOADL |
[R] [@] |
|
| 0x14 |
SAVEH |
[R] [@] |
|
| 0x15 |
SAVEL |
[R] [@] |
|
| Math |
|
|
|
| 0x20 |
CLR |
[R] |
|
| 0x21 |
ADD |
[R] [@] |
|
| 0x22 |
SUB |
[R] [@] |
|
| 0x23 |
DIV |
[R] [@] |
|
| 0x24 |
MUL |
[R] [@] |
|
| 0x25 |
INC |
[R] |
|
| 0x26 |
DEC |
[R] |
|
| Logic |
|
|
|
| 0x30 |
NOT |
[R] |
|
| 0x31 |
AND |
[R] [@] |
|
| 0x32 |
OR |
[R] [@] |
|
| 0x33 |
XOR |
[R] [@] |
|
| 0x34 |
SHL |
[R] [0-7] |
Shift Left |
| 0x35 |
SHR |
[R] [0-7] |
Shift Right |
| 0x36 |
BTS |
[R] [1-8] |
Bit Set |
| 0x37 |
BTC |
[R] [1-8] |
Bit Clear |
| Stack |
|
|
|
| 0x40 |
CALL |
[#|:] |
|
| 0x41 |
RET |
|
|
| 0x42 |
PUSH |
[R] |
|
| 0x43 |
POP |
[R] |
|
| Program Flow |
|
|
|
| 0x50 |
HALT |
|
|
| 0x51 |
JMP |
[#|:] |
|
| 0x52 |
JZ |
[R] [#|:] |
|
| 0x53 |
JNZ |
[R] [#|:] |
|
| 0x54 |
JBS |
[R] [1-8] [#|:] |
|
| 0x55 |
JBC |
[R] [1-8] [#|:] |
|
| System |
|
|
|
| 0x60 |
SYS |
[0-255] |
Syscall, parameters depend on call |
| 0x61 |
BRK |
|
Pauses program execution if debug is enabled |
Assembler Only
| ASM |
Parameters |
Notes |
| ORIGIN |
[#] |
Sets the Memory Address for the next instruction |
| ALIAS |
X Y |
Replaces word X with word Y where X and Y are alpha numberic, only applies after the instruction |
Program Format
ORIGIN 0
:MARKERA JMP :MARKERB # This is a comment
:MARKERB INC A
JMP :MARKERA
[...ASM Instrictions...]
MEMORY
0x100 "string abcd"
100 0x00 00 00
Sam Stevens
cf9004e206