Multibus-International

Model: SBC546

Manufactured by: Intel Corporation

The SBC board is a terminal and line printer controller for the Intel system 320. The board communicates with a MULTIBUS host as a slave board.

The SBC546 uses an Intel 80186 microprocessor, operating at 8MHz as its CPU. The 80186 controls four serial channels, sending data to or receiving data form 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 reverse the board, or to reset an interrupt to the MULTIBUS host generated by the board.

The four serial interfaces on the SBC546 board are through four 9-pin connectors. The 9-pin connections are fully compatible with the IBM PCAT connections.

The line printer interface is compatible with the IBM line printer interface.

The SBC546 board has two on-board 82530 Serial Communications Controllers (SCC). Each 82530 SCC contains two on-chip baud generators, allowing each channel to be independently programmed for separate baud rates. The maximum transfer rate per channel per channel is 19.2 baud.

The SBC board has four 64Kx4 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 SBC546 is backed up by a non-rechargeable battery which keeps the clock/calendar operating for six months with all other power off.

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