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Added a note for the 603

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dingusdev 2024-04-21 11:11:56 -07:00
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zdocs/developers/powerpc.md
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@ -42,7 +42,8 @@ Up to 128 instruction entries and 128 data entries can be stored at a time.
# Special Registers
| Register Name | Register Number | Purpose | :-------------------------------- | :------------------- | :---------------------------------------------------- |
| Register Name | Register Number | Purpose |
| :-------------------------------- | :------------------- | :---------------------------------------------------- |
| Multiply Quotient Register (MQ) | 0 | (601 only) |
| Integer Exception (XER) | 1 | |
| RTC Upper Register (RTCU) | 4 | (601 only) |
@ -77,4 +78,6 @@ Up to 128 instruction entries and 128 data entries can be stored at a time.
* As the PowerPC does not have an instruction to load an immediate 32-bit value, it's common to see a lis/ori coding pattern.
* The 603 relies on the instructions tlbld and tlbli to assist in TLB reloading.
* To accomodate for early programs compiled on PowerPC 601 Macs, the classic Mac OS has to emulate the POWER instructions that were removed from later processors.