REC 8726 (RAM Expansion Controller) reference
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | ||
|---|---|---|---|---|---|---|---|---|---|
| $DF00 (R) | SR | IRQ | EOB | Verify | Size | Version | |||
| $DF01 (R/W) | CR | Execute | reserved ² | Load | FF00 | reserved ² | Transfer Type | ||
| $DF02 (R/W) | C64/C128 start address (A7-A0) | ||||||||
| $DF03 (R/W) | C64/C128 start address (A15-A8) | ||||||||
| $DF04 (R/W) | REU start address (A7-A0) | ||||||||
| $DF05 (R/W) | REU start address (A15-A8) | ||||||||
| $DF06 (R/W) | unused ¹ | REU start address (A18-A16) | |||||||
| $DF07 (R/W) | Transfer length (D7-D0) | ||||||||
| $DF08 (R/W) | Transfer length (D15-D8) | ||||||||
| $DF09 (R/W) | IRQE | EOBE | VerifyE | unused ¹ | |||||
| $DF0A (R/W) | ACR | C64 fixed | REU fixed | unused ¹ | |||||
| 0 | C64 to REU |
| 1 | REU to C64 |
| 2 | Swap |
| 3 | Verify |