STD to ISA bus adapter | Model 422

Model 422 STD to ISA bus adapter
  • 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 a legacy product and is not recommended for new designs. Legacy products are available but may have lead times up to 12 weeks and minimum order requirements. Use our Product Finder to find a comparable product or contact our Design Support Team.


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.


File Version Type Size
Model 422 Manual1.0.0PDF42 KB

Pricing & Ordering

Model Description Qty 1 Qty 2-9 Order Qty.
422STD to ISA bus adapterCallCall 

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