ST5000 PC-104 IO Port Addresses

These are the IO addresses used on the PC 104 bus.

ST5200 Series PC-104 IO Port Addresses
Port R/W Name Comment
0x100 RW Frame Count Counts up
0x102 W Clear IRQ 10 Image Stored Interrupt
0x104 RW CSR 2 -
0x106 W Clear IRQ 11 Vertical Sync Interrupt
0x108 N/A Not Used -
0x10A RW CSR 1 -
0x10C W Clear IRQ 15 Get Out of Town Interrupt
0x10E N/A Not Used -
0x110 W RAM A Page Select 0-15 selects 0xC8000-0xCFFFF
0x112 W RAM B Page Select 0-15 selects 0xD0000-0xD7FFF
0x120 RW ADC 1 Select -
0x122 RW ADC 2 Select -
0x124 W DAC 1 Select -
0x126 W DAC 2 Select -
0x128 W DAC 3 Select -
0x12A W DAC 4 Select -
0x12C W Digital Outputs Bits 0-7; 8-15 are N/A
0x12E R Digital Inputs Bits 0-7: readback of digital outputs
Bits 8-15: Digital inputs.
0x130 RW CSR 3 Graphics RAM (GRAM) control
0x132 RW Bit Plane Register (BPR) Bits 0-7 select GRAM planes 0-7
0x134 RW Graphics Intensity Register (GIR) GRAM Brightness = 0 to 255
0x136 RW Graphics Page Register (GPR) 0-31 selects 0xDC000-0xDFFFF

 

ST5400 Series PC-104 IO Port Addresses
Port R/W Name Comment
0x100 TBD Not Used -
0x102 TBD Not Used -
0x104 RW CSR 2 General Purpose Outputs
0x106 TBD Not Used -
0x108 TBD Not Used -
0x10A RW CSR 1 Image Control Bits
0x10C TBD Not Used IBPR?
0x10E TBD Not Used IIR?
0x110 TBD Not Used IPR?
0x112 TBD Not Used -
0x120 RW ADC 1 Select -
0x122 RW ADC 2 Select -
0x124 W DAC 1 Select -
0x126 W DAC 2 Select -
0x128 W DAC 3 Select -
0x12A W DAC 4 Select -
0x12C W Digital Outputs Bits 0-7; 8-15 are N/A
0x12E R Digital Inputs Bits 0-7: readback of digital outputs
Bits 8-15: Digital inputs.
0x130 RW CSR 3 Graphics Control Bits
0x132 RW Graphics Bit Plane Register (BBPR) Bits 0-7 select GRAM planes 0-7
0x134 RW Graphics Intensity Register (GIR) GRAM Brightness = 0 to 255
0x136 RW Graphics Page Register (GPR) 0-15 Selects ???