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Izaya 2017-03-13 17:36:11 +11:00
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README.md
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@ -13,23 +13,23 @@ The T400 is an 8-bit stack machine operating at 1Hz (due to ABMs only running on
### Instructions
Any words encountered that aren't instructions are pushed to the stack. This makes very compact simple program code.
| ins | function | mnemonic |
|--------|----------------------------------------------|---------------|
| 255 | push program counter | ppc |
| 254 | swap TOS | swp |
| 253 | read memory from TOS | read |
| 252 | write to memory from TOS | write |
| 251 | add TOS | add |
| 250 | suptract TOS | sub |
| 249 | jump to TOS | jmp |
| 248 | skip if TOS = zero | sez |
| 247 | jump if TOS = zero | jez |
| 246 | jump to subroutine, push pc to retstack | jsr |
| 245 | return from subroutine, PC = top of retstack | ret |
| 244 | duplicate TOS | dup |
| 243 | drop TOS | drop |
| 242 | halt processor | hlt |
| 241 | pre-read address at TOS | prd |
| ins | function | mnemonic |
|-------|-----------------------------------------------|---------------|
| 255 | push program counter | ppc |
| 254 | swap TOS | swp |
| 253 | read memory from TOS | read |
| 252 | write to memory from TOS | write |
| 251 | add TOS | add |
| 250 | suptract TOS | sub |
| 249 | jump to TOS | jmp |
| 248 | skip if TOS = zero | sez |
| 247 | jump if TOS = zero | jez |
| 246 | jump to subroutine, push pc to retstack | jsr |
| 245 | return from subroutine, PC = top of retstack | ret |
| 244 | duplicate TOS | dup |
| 243 | drop TOS | drop |
| 242 | halt processor | hlt |
| 241 | pre-read address at TOS | prd |
### I/O
The T408 uses memory-mapped I/O. This may seem like a stupid idea on a machine with 8-bit addressing but port-based I/O isn't hugely sane.