Vintage ISC Bunker Ramo PLCM II S-100 Z80 Communications Controller Card
Original vintage ISC Systems / Bunker Ramo PLCM II communications controller board, removed from an ISC-Bunker Ramo S-100 computer system.
This late-1980s circuit board features a Zilog Z80 processor, dual Z80 serial interface controllers, onboard memory, original firmware ROM, configuration switches, and status indicator LEDs.
The PLCM II appears to have been designed for multi-channel serial communications within ISC\'s proprietary computer ISC Systems / Bunker Ramo
Board Designation: PLCM II
Assembly Number: 13-00092
PCB Number: 40-00092-003
PCB Revision: A
Assembly Revision: M-003 (sticker)
Processor: Zilog Z0840004PSC Z80 CPU
Serial Controllers: 2 × Zilog Z0844004PSC Z80 SIO/0
Timer: Zilog Z0843004PSC Z80 CTC
Memory: AMD AM9128-10PC SRAM chips
Firmware ROM: 78-00130-102
Bus Interface: S-100
Country of Manufacture: Not confirmed
Approximate Era: Late communications controller architecture
Dual Z80 SIO chips providing hardware support for multiple serial channels
Original ISC firmware ROM
Onboard SRAM and supporting logic circuitry
Configuration DIP switches and jumper settings
Multiple status indicator LEDs
S-100 bus edge connector
Original vintage through-hole electronic – Untested
Removed from an ISC-Bunker Ramo computer system.
The board appears substantially complete with its original integrated circuits, firmware ROM, configuration switches, and electronic components present as pictured.
Shows normal signs of age, handling, and previous installation.
No operational testing has been performed. Working condition is unknown.
CompatibilityThis is specialized vintage S-100 hardware intended for ISC-Bunker Ramo computer systems.
Compatibility with other S-100 computers has not been verified. Additional proprietary hardware, software, firmware, or specific configuration settings may be required.
Please examine all photographs carefully for exact condition, component configuration, and part numbers.
Included: One ISC Bunker Ramo PLCM II S-100 communications controller circuit board only.
No software, manuals, or additional accessories included.
Ideal for vintage computer restoration, replacement parts, or collectors of ISC Systems, Bunker Ramo, Zilog Z80, and S-100 computing hardware.
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