projects / ned1 / blame
| Commit | Line | Data |
|---|---|---|
| bc5b63cf AT |
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 |