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Special Registers
EBX-22 Reference Manual
74
Jumper Status Register
JSR (Read Only) 1D2h
D7 D6 D5 D4 D3 D2 D1 D0
Reserved Reserved Reserved Reserved Reserved Reserved VB_SEL Reserved
Table 41: JSR Register Bit Assignments
Bit Mnemonic Description
D7-D2 –
Reserved
– These bits have no function.
D1
VB_SEL
Video BIOS Selection –
Indicates the status of jumper V6[3-4].
0 = Jumper in, Primary Video BIOS selected
1 = Jumper out, Secondary Video BIOS selected
This bit is read-only.
D0
–
Reserved
– This bit has no function.
General Purpose Output Register
GPO (Read/Write) 1D4h
D7 D6 D5 D4 D3 D2 D1 D0
Reserved Reserved Reserved Reserved
Reserved
GPO2 GPO1 GPO0
This register is used for general purpose outputs.
Table 42: GPO Register Bit Assignments
Bit Mnemonic
Description
D7-D3 –
Reserved
– These bits have no function.
D2-D0 GPO
General Purpose Outputs
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