| 1 | putchar |
| 2 | # Description: |
| 3 | # Writes one character to the terminal. |
| 4 | # Stack Requirements: |
| 5 | # Character to write |
| 6 | # Return PC <-- TOS |
| 7 | WORD_134217728 # XBUF |
| 8 | WORD_134217732 # XCSR |
| 9 | LDSP+3 |
| 10 | SWAP |
| 11 | putcharloop |
| 12 | LDSP+0 |
| 13 | LOAD |
| 14 | TEST |
| 15 | BRZ>putcharloop |
| 16 | TEST # Drop XCSR from stack |
| 17 | SWAP |
| 18 | STORE |
| 19 | # Wrote the character. Clean up stack and return. |
| 20 | STSP+0 |
| 21 | RTS |
| 22 | |
| 23 | getchar |
| 24 | # Description: |
| 25 | # Reads one character from the terminal. |
| 26 | # Stack Requirements: |
| 27 | # Return PC <-- TOS |
| 28 | WORD_134217736 # RBUF |
| 29 | WORD_134217740 # RCSR |
| 30 | getcharloop |
| 31 | LDSP+0 |
| 32 | LOAD |
| 33 | TEST |
| 34 | BRZ>getcharloop |
| 35 | LDSP+1 |
| 36 | LOAD |
| 37 | # Found a character. Clean up stack and return. |
| 38 | STSP+0 |
| 39 | STSP+0 |
| 40 | SWAP |
| 41 | RTS |