Multibus-International

Model: SBC549

Manufactured by: Intel Corporation

4 Channel, Terminal and Line Printer Controller, 80186 Microprocessor, 8MHz

The SBC549 board is a terminal and line printer controller.  The board communicates with a MULTIBUS host as a slave board.

The board uses an Intel 80186 microprocessor, operating at 8MHz as its CPU.  The 80186 controls four serial channels, sending data to or receiving data from the MULTIBUS host, and a line printer interface.  The on-board 80186 gains the attention of the MULTIBUS host by generating an interrupt over the MULTIBUS interface to the host.  A flag byte mechanism allows the MULTIBUS host to interrupt the board, to reset the board, or to reset an interrupt to the MULTIBUS host generated by the board.

The four serial interfaces on the SBC549 board are through one 40-pin connector.  The 40-pin connector can be attached to IBM PCAT compatible 9-pin connectors via ribbon cables.

The line printer interface is jumper selectable with the IBM or Centronics line printer interface through a 26-pin connector.

The SBC549 board has two on-board 82530 Serial Communications Controllers (SCC). Each 82530 SCC contains two on-chip baud rate generators, allowing each channel to be independently programmed for separate baud rates.  The maximum transfer rate per channel is 19.2K baud.

The SBC549 board has four 64K x 4 DRAM (Dynamic RAM) devices, a total of 128 kbytes per board.  The upper 32K bytes can be addressed by other MULTIBUS boards.

The board also includes two 28-pin sockets.  These sockets are populated with firmware EPROMs.

A clock/calendar circuit, on the SBC549, is backed up by a non-rechargeable battery which keeps the clock/calendar operating for six months with all other power off. 

Click on thumbnail for larger image. Call for price.