AC2 interface card

The AC2 card is a 16-bit ISA expansion card that is designed to fit into one of the 16-bit expansion slots provided in a PC.

AC2 card with dimensions

Attention electrostatic sensitive label

 

The AC2 contains static sensitive components.  Observe anti-static handling precautions, including the use of earth straps during handling and installation.

AC2 I/O space base address

The AC2 is supplied set to I/O base address 0200H 16-bit wide data and ISA bus mode. If the base address is already used, or the PC has difficulty in accessing the card, then the base address can be changed to one of the following by altering the switches on the card as shown below. 

PC function

Address

 Switch (SW1) Way 1

 Switch (SW1) Way 2

 Switch (SW1) Way 3

 Switch (SW1) Way 4

Games adaptor

 0200H

 Off

 Off

 Off

 Off

PC expansion port

0210H

 On

 Off

 Off

 Off

Prototype adaptor

0280H

 Off

 On

 Off

 Off

Prototype adaptor

0300H

 On

 On

 Off

 Off

Not defined

0310H 

 Off

 Off

 On

 Off

Not defined

0320H 

 On

 Off

 On

 Off

Not defined

0340H

 Off

 On

 On

 Off

Not defined

0350H

 On

 On

 On

 Off

Not defined

0390H 

 Off

 Off

 Off

 On

Not defined

03A0H 

 On

 Off

 Off

 On

Not defined

0480H

 Off

 On

 Off

 On

Not defined

0520H 

 On

 On

 Off

 On

Not defined

0540H

 Off

 Off

 On

 On

Not defined

0550H 

 On

 Off

 On

 On

Not defined

0590H 

 Off

 On

 On

 On

Not defined

05A0H

 On

 On

 On

 On

NOTE: All 16 address bits on the PC expansion bus are decoded.  Clashes are still possible with the addresses of other adaptor cards if their base addresses are set below 400H and match the lower 10 bits of the AC2 addresses.

AC2 SW2 settings

The AC2 can operate with 8 or 16-bit wide data and (with a suitable hardware adaptor) support the Delta_Tau bus used in some CMM controllers. SW2 allows these selections to be made.

 

Switch (SW1) Way 1

Switch (SW1) Way 2

Switch (SW1) Way 3

Switch (SW1) Way 4

 Switch

setting

8/16-bit

AUX_SW1

Reserved

Reserved

Off

16-bit

ISA BUS

Future use

Future use

On

8-bit

Delta_Tau BUS

Future use

Future use

 

CAUTION: SW2 way 2 must be set correctly for ISA bus operation, otherwise damage may be caused either to the AC2 or the host PC.