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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.
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.