Special Registers
EPM-14 Reference Manual
40
Jumper and Status Register
JSR (Read-only) 1D2h
D7 D6 D5 D4 D3 D2 D1 D0
Reserved Reserved Reserved Reserved Reserved
GPI
VB_SEL Reserved
Table 22: Jumper and Status Register Bit Assignments
Bit Mnemonic Description
D7-D3 –
Reserved
– These bits have no function.
D2 GPI
General Purpose Input
– Indicates the status of V2[3-4]. This bit is read-only.
0 = Jumper out
1 = Jumper in
D1 VB_SEL
Video BIOS Selection –
Indicates the status of jumper V2[5-6]. This bit is
read-only.
0 = Jumper out, Secondary Video BIOS selected
1 = Jumper in, Primary Video BIOS selected
D0 –
Reserved
– This bit has no function.