This was a Cromemco board to interact
with a General Purpose Instrument Bus. It came out some time in 1980.
The Cromemco General Purpose Interface Bus (GPIB) Board
was an intelligent interface between a host system S-100 bus and an IEEE 488
instrumentation bus. Two TI 2516 EPROM sockets (4 Kbytes) supply the GPIBB
program store, and 4 Kbytes of RAM memory were supplied for data buffering,
scratchpad memory and the Z-80A stack. The firmware program store controled a
dedicated Z-80A microprocessor, clocked at 4 MHz, to manage all interface
functions. GPIBB connector J2 provided the standard GPIB (IEEE Std 488-1978)
interface, and connector J1 supplied a general purpose TTL parallel I/O port
(this port was termed the External I/O port throughout the manual). All GPIB
interface functions were managed by the Texas Instruments TMS 9914 GPIB Adapter.
A somewhat similar boards was the
Pickles & Trout
488 board.
The rather large manual for this board (36MG), can be obtained
here.
