Artist graphics registers (used in HP9000/712)

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Line 20: Line 20:
 
|0x100600
 
|0x100600
 
|Word
 
|Word
|Bit mode VRAM write FIFO
+
|Bit mode VRAM write FIFO, with every write the number of X pixels is added to the write index.
 
|-
 
|-
 
|0x100620
 
|0x100620
 
|Word
 
|Word
|Byte mode VRAM write FIFO
+
|Byte mode VRAM write FIFO, with every write the number of X pixels is added to the write index
 
|-
 
|-
 
|0x118010
 
|0x118010

Revision as of 18:17, 7 January 2019

Artist is the onboard graphics chip used in the HP9000/712. According to HP, it's mostly compatible to CRX. On the 712, it spans the I/O memory range 0xf4000000-0xf5ffffff. Unfortunately no documentation seems to be available, but this is what i figured out by looking at the memory write from the Bootrom/STI code:

Offset Size Description
0x1004a0 Word VRAM offset (starting address) for write FIFO registers
0x100800 Word Block mover source X=Bit31-16 Y=Bit15-0
0x100a04 Word Block mover size Width=Bit31-16 Height=Bit15-0
0x100600 Word Bit mode VRAM write FIFO, with every write the number of X pixels is added to the write index.
0x100620 Word Byte mode VRAM write FIFO, with every write the number of X pixels is added to the write index
0x118010 Word foreground color used in block move operations
0x118014 Word background color used in block move operations
0x30023c Word Used in selftest code, looks like signature testing result register?
0x380008 Word Unknown status register, returning 0x20000000 to make STI happy
0x380000 Word Unknown status register, returning 0 to make STI happy
0x380008 Word Unknown status register, returning 0x20000000 to make STI happy
0x0118406c-0x011847ff Word Color map used by STI code - Strange offset address, maybe software configurable? One entry spans 32 bit, where Bit 23-16=R, Bit16-8=G, Bit7-0=B
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