INTERRUPT
REGISTER STACKING
| Stack | 6809 FIRQ (5+3) | 6809 IRQ (5+12) | 6309 IRQ (5+14) |
|---|---|---|---|
| +14 | CC | ||
| +13 | A | ||
| +12 | CC | B | |
| +11 | A | E | |
| +10 | B | F | |
| +09 | DP | DP | |
| +08 | XH | XH | |
| +07 | XL | XL | |
| +06 | YH | YH | |
| +05 | YL | YL | |
| +04 | USH | USH | |
| +03 | CC | USL | USL |
| +02 | PCH | PCH | PCH |
| +01 | PCL | PCL | PCL |
| +00 | Stack | Stack | Stack |
RTS
Return to Tandy Color Computer