STD to ISA bus adapter | Model 422
- Connects STDbus backplane to an ISA slot in a desktop PC
- Parallel RS-422 bus provides high noise immunity
- Supplied with 1 meter interconnecting cables, STD and ISA boards
- Low Cost
- Decodes 8-bit address
Model 422 is obsolete. This archived information is provided as a courtesy to customers who own model 422 units.
Description
Model 422 is a bus-to-bus adapter that extends an ISA bus and connects it to a card rack of STDbus I/O boards. It has three parts: an ISA board, an STDbus board, and a set of flat cables to connect the two boards. The 422 makes the STD boards appear as additional ISA boards in a PC.
Address Decoding
The ISA board decodes the high 8-bits of the address bus. All STD bus I/O boards are mapped into a 256-address window in the ISA I/O space. The standard address range for this window is 0x0100 to 0x01FF. The address window may be changed by reprogramming a PLD on the ISA card.
Documentation
| File | Version | Date M-D-Y | Type | Size |
|---|---|---|---|---|
| Model 422 Manual | 1.0.0 | 10-24-19 | 42 KB |