BOTGA Hardware Collection

The iSBC 094 4K-Byte CMOS RAM Memory/Battery Backup Board .is a member of Intel’s complete line of iSBC memory
and I/O expansion boards. The iSBC 094 interfaces directly to iSBC single board computer via the system bus to ex
pand RAM memory capacity. The board contains 4K bytes of read/write memory, implemented using 32 Intel 5101
CMOS RAM memory components. On· board rechargeable batteries and charging circuitry insure that data contained
in RAM will be retained for at least 96 hours after system bus power (+ 5V) is removed. Critical system parameters
stored in the iSBC 094 RAM will thus be saved during temporary system power failures. Full power·fail interface logic
is provided on the board to generate a CPU interrupt when system power fails. Orderly system shutdown procedures
may then be executed and critical system parameters may be retrieved and stored. The use of CMOS RAM on the iSBC
094 also reduces power dissipation during normal system operation. The iSBC 094 contains jumpers for use in select
ing a contiguous 4K·byte address segment beginning on any 4K memory address boundary (OOOOH, 1000H, 2000H,
etc.). Read/write buffers reside on the board to buffer all data written into or read from the memory array. All address,
data, and command signals on the bus interface are TTL compatible.