VR4300: Difference between revisions
Added section for known differences between original VR4300 and one used in the N64.
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The '''VR4300''' is the CPU of the Nintendo 64, and is
[[:File:VR4300-Users-Manual.pdf|VR4300 Users Manual]]
= Naming History =
In 1993, [[w:MIPS Technologies|MIPS Technologies, Inc.]] (MTI), the same company that designed the MIPS III architecture, developed the [[w:R4200|R4200]] microprocessor. Later in 1995, they made the R4300i, a derivative of the R4200. When MTI licensed it to NEC and Toshiba, those companies renamed the chips the VR4300 and TX4300 respectively. The microprocessor used in the N64's CPU, is a derivative of NEC's VR4300.
Over the years, these model names have been incorrectly identified. There is no such thing as a VR4300i, nor is there a NEC R4300.
= Modifications =
The VR4300 used in the N64 has been modified compared to the original VR4300 chip. Currently the known differences include:
* Six pins are in different locations
{| class="wikitable"
! !! Original !! N64
|-
| /INT1 || 58 || 57
|-
| JTCK || 57 || 58
|-
| /EValid || 105 || 104
|-
| /Reset || 104 || 105
|-
| DivMode0 || 116 || 112
|-
| DivMode1 || 112 || 116
|}
''There may be other differences, more research is required.''
= Known Bugs =
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