68020 Registers
The Motorola 68000 and 68010 processors have very similar register sets. The primary differences between the two are related to enhancements in the 68010 for improved performance and additional features. Here are the key differences:
68000 Registers
General Purpose Registers
D0 - D7 (Data Registers)
A0 - A7 (Address Registers)
Stack Pointer
A7 (User Stack Pointer, USP)
SSP (Supervisor Stack Pointer)
Program Counter
PC (Program Counter)
Status Register
SR (Status Register)
Condition Code Register
CCR (Condition Code Register)
68010 Registers
The 68010 includes all the registers of the 68000 with the following enhancements:
Vector Base Register (VBR)
Allows relocation of the exception vector table, providing more flexibility in handling exceptions.
Alternate Function Code Registers (SFC and DFC)
SFC (Source Function Code Register)
DFC (Destination Function Code Register)
These registers are used to control the function codes for memory access, allowing more sophisticated memory management.
Summary
The 68010 includes all the registers of the 68000.
The 68010 adds the Vector Base Register (VBR) for relocating the exception vector table.
The 68010 introduces Source Function Code Register (SFC) and Destination Function Code Register (DFC) for advanced memory management.
These enhancements in the 68010 provide improved performance and additional features compared to the 68000.