2021-04-03 22:03:47 -04:00
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# MatCat 8SA1 CPU Simulator
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2021-04-10 04:08:33 -04:00
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This is a simple JS based simulator to simulate the function of the 8SA1 CPU.
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## Work In Progress
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### ISA Layout
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#### LDx 0x0000:0x00FF / STx 0x0100:0x01FF
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| bits | mode |
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| --- | --- |
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| 0b000XXXXX | Immediate (8/16) |
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| 0b001XXXXX | Absolute + (Immediate (16) Offset) |
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| 0b010XXXXX | Absolute (16) |
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| 0b011XXXXX | Absolute (24) |
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| 0b100XXXXX | Indirect (16) |
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| 0b101XXXXX | Indirect (24) |
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| 0b110XXXXX | Indirect + (Immediate (16) Offset) |
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| 0b111XXXXX | Absolute + (Absolute (16) Offset) |
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| Registers | bits |
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| --- | --- |
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| AL | 0b00010 0x02 |
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| AH | 0b00011 0x03 |
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| BL | 0b00100 0x04 |
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| BH | 0b00101 0x05 |
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| CL | 0b00110 0x06 |
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| CH | 0b00111 0x07 |
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| DL | 0b01000 0x08 |
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| DH | 0b01001 0x09 |
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| AB | 0b01010 0x0A |
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| AC | 0b01011 0x0B |
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| AD | 0b01100 0x0C |
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| BA | 0b01101 0x0D |
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| BC | 0b01110 0x0E |
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| BD | 0b01111 0x0F |
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| CA | 0b10000 0x10 |
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| CB | 0b10001 0x11 |
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| CD | 0b10010 0x12 |
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| DA | 0b10011 0x13 |
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| DB | 0b10100 0x14 |
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| DC | 0b10101 0x15 |
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#### Tx 0x0200:0x027F
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#### PHx/PLx 0x0280:0x02BF
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#### Jumps 0x2C0 - 0x2FF
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#### ALU 0x0300 - 0x3DF
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#### NOP 0x3FF
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