Ithaca Audio VIO card.
This was Intersystems a later Serial IO card.
In early systems, a single serial communications link was
all that most microcomputers required. As things evolved fpt the S-100 bus this
longer was the case. A new generation of multi-tasking, multi-user operating
systems and hardware required I/O in depth. The InterSystems 6-SI0 provided this
facility elegantly, reliably, and economically. Six channels of
programmable-baud-rate RS-232 interface were provided; two of the channels could
alternately provide current loop capability, and two other channels included the
necessary clock connections for synchronous data communications.
The 6-SIO was available in two versions, with or without interrupt controllers.
For systems that needed the response time and throughput advantages of
interrupt-driven I/O, the 6SI0-1 had two 9519 interrupt controllers to provide
16 levels of interrupt response. The interrupts could be individually disabled,
masked, and adjusted to a variety of operational modes by a powerful selection
of software commands. In many applications, the 6S1O-0 board, with no
interrupt, controller, can provide a less expensive means of serial I/O
Each of the boards could be operated as the single source of interrupts in the
system, or, if vectored interrupt handling was available, as one of eight,
sources of interrupts.This
manual contains an introduction to the board, a functional overview of the
board's operation, and setup instructions.
The schematic for this board can be obtained
here. The manual can be obtained
Other InterSystems S-100 Boards
64K Dynamic RAM
256K Dynamic RAM
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