<< Previous | Next >>

> LD (pd+BC),HL Load Rabbit 4000 Instruction

> Opcode | Instruction | Clocks | Operation
> -- | LD (pd+BC),HL | 12 (2,2,2,3,3) | (pd + BC) = L (pd + BC + 1) = H
> ED 07 | LD (PW+BC),HL | 12 (2,2,2,3,3) | (PW + BC) = L (PW + BC + 1) = H
> ED 17 | LD (PX+BC),HL | 12 (2,2,2,3,3) | (PX + BC) = L (PX + BC + 1) = H
> ED 27 | LD (PY+BC),HL | 12 (2,2,2,3,3) | (PY + BC) = L (PY + BC + 1) = H
> ED 37 | LD (PZ+BC),HL | 12 (2,2,2,3,3) | (PZ + BC) = L (PZ + BC + 1) = H

> Flags | ALTD | IOI/IOE
> S | Z | L/V | C | F | R | SP | S | D
> - | - | - | - |  |  |  |  |

> #### Description

> Loads the memory location whose address is computed as the sum of pd and BC with HL.

> The address is treated either as a logical address that will be passed through the MMU for translation into a physical address or as a physical address that does not need MMU translation.

> If pd is 0xFFFFxxxx, i.e., the upper 16 bits are all ones, it represents a logical address. This is called a "long logical" address. Otherwise, it is a physical address with the low 20 bits or 24 bits being significant (depending on the memory available).

<< Previous | Next >>