This listing is for a matched pair of vintage memory/logic boards, perfect for those working with or restoring retro computing systems. Both boards feature a nearly identical layout and are designed with high-quality components from leading manufacturers, making them an excellent addition to your collection or project.
Board 1 – Key Components and Part Numbers:
- DRAM Chips:
- (x36) 24M4321-12 – High-capacity DRAM modules.
- Likely used for system memory or buffer storage.
- EPROM Chips:
- (x2) MB914HX – Pre-programmed firmware chips.
- (x1) DW61 – Marked with system-specific firmware or instructions.
- Intel Chips:
- (x1) P8097 – Intel microcontroller/processor.
- (x1) L1221008 – Likely system controller or interface chip.
- Oscillator Module:
- KXO-01 – Provides a stable clock signal for timing.
- Other Components:
- Gold-plated edge connector for system integration.
Board 2 – Key Components and Part Numbers:
- DRAM Chips:
- (x36) 24M4321-12 – High-capacity DRAM modules, identical to Board 1.
- Designed for memory expansion or processing.
- EPROM Chips:
- (x2) MB914HX – Matches Board 1, stores system firmware.
- (x1) DW61 – Likely complementary to Board 1 firmware.
- Intel Chips:
- (x1) P8097 – Microcontroller/processor for data handling.
- (x1) L1221008 – System logic/interface chip.
- Oscillator Module:
- KXO-01 – Matches Board 1 for synchronized timing.
- Other Components:
- Gold-plated edge connector for interfacing.
Condition:
- Both boards are visually inspected and appear in good physical condition. Components, soldering, and connectors are intact.
- Note: These boards are sold as-is, untested, and without guarantees of functionality. Ideal for collectors, enthusiasts, or as spare parts for restoration projects.
Potential Uses:
- Memory expansion or logic processing modules for vintage industrial or mainframe systems.
- Great for hobbyists looking to repurpose or study vintage computing architecture.
- Perfect for resale of individual components such as DRAM, EPROM, or Intel chips.
Board 3
- Prominent Components:
- EPROM/ROM Chips:
- 4 x Chips with handwritten labels (e.g., program storage or system firmware).
- These are likely custom-programmed chips critical for the board’s specific operation.
- Logic ICs (74-series):
- Multiple TTL chips (e.g., 74LS00, 74LS74) for implementing various logic functions.
- Edge Connector:
- Standard ISA-type connector for interfacing with older systems or test equipment.
- Large Blue Connectors:
- Used for connecting peripheral components or other boards in a larger system.
- EPROM/ROM Chips:
- Potential Use: This board appears to be part of an industrial control system or computing device, possibly from the 1980s–1990s. It may have been used for logic processing or memory-related functions.
Board 4
- Prominent Components:
- Intel 8255 PPI Chip:
- Programmable Peripheral Interface, often used for interfacing microprocessors with peripheral devices.
- Toshiba TC5565APL-12 SRAM (x2):
- Static RAM chips for fast, temporary data storage.
- Logic ICs (74-series):
- Additional TTL chips for handling logic operations.
- HM6264LP SRAM Chips:
- High-capacity SRAM for data storage, often used in embedded systems.
- Crystal Oscillators:
- Provide clock signals for synchronizing operations.
- Edge Connector:
- ISA-compatible edge connector, indicating legacy use in computing or industrial systems.
- Intel 8255 PPI Chip:
Potential Use: This board is likely designed for memory or I/O management in an industrial computing environment.
FREE THROW IN BOARD WHEN THE LOT IS PURCHASED VALUED AT $750







