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Hello everyone,
I have a collection of 12 vintage boards from a Varityper 560 system. These are original 1970s/80s TTL-based boards in very clean visual condition.
Vintage TTL Computer Boards – Component Summary (Concise & Technical)
Board 1 – Multi-Language ROM
- Custom ROM ICs (font/language data)
- Standard TTL: 7404, 7408, 74157
→ Stores character sets and multilingual fonts
Board 2 – CPU DATA
- 2× DM74181 (ALU)
- N82S09 PROM (microcode/data)
- TTL: 74157, 74180, 7495
→ Arithmetic/logic processing core
Board 3 – CPU CONTROL
- Intersil PROMs (5300/5320/5331 series)
- TTL: 74161, 7442, 7430
→ Microcode control & instruction sequencing
Board 4 – Character Generator
- Character ROMs (bitmap fonts)
- 74LS195, 74161, 74157
→ Converts data into display/printable characters
Board 5 – 64K DRAM
- MM5290 DRAM chips
- TTL address/control logic
→ Main system memory (+5V / +12V / -5V)
Board 6 – Memory Interface / Buffer
- 2102 SRAM
- 7495 shift registers, 74157 mux
→ Data buffering & bit-level formatting
Board 7 – Disk Controller No.2
- TTL timing & control logic (7493, 74107)
→ Secondary disk I/O control
Board 8 – Disk Controller No.1
- 2102 RAM buffer
- 74157 mux + LED diagnostics
→ Primary disk controller with buffer memory
Board 9 – D/A & Stepper
- Discrete DAC (resistor network)
- Counters + logic (74193, 7442)
→ Motion control & analog signal generation
Board 10 – LVC Stepper
- 74193 counters, 74107 flip-flops
→ Stepper sequencing & direction control
Board 11 – Font Interface III
- TTL counters, decoders, shift registers
→ Font processing & output interface
Board 12 – Backplane / PCB
- Passive interconnect board
→ System bus & board connectivity
• DM74181 ALU (Arithmetic Logic Unit)
• Intersil 5300 / 5320 / 5331 PROM (Microcode ROMs)
• N82S09 Bipolar PROM
• MM5290 DRAM (64K Dynamic Memory chips)
• PFR8043 Custom ROM IC
⸻
Additional Vintage Components
• 2102 SRAM (1K Static RAM)
• SN74193 Up/Down Counter
• SN74161 Binary Counter
• SN7442 BCD Decoder
• SN74157 Multiplexer
• SN7495 Shift Register
⸻
Supporting Logic
• SN7400 NAND Gates
• SN7404 Inverters
• SN7408 AND Gates
• NE555 Timer IC
---
System Summary:
Complete 1970s TTL-based computing/printing system with CPU (ALU + microcode), RAM, ROM, disk control, character generation, and motion control.
From Varityper 560 system
Please PM me if interested or if you have any questions. I can provide more detailed photos of specific chips upon request.
I have a collection of 12 vintage boards from a Varityper 560 system. These are original 1970s/80s TTL-based boards in very clean visual condition.
Vintage TTL Computer Boards – Component Summary (Concise & Technical)
Board 1 – Multi-Language ROM
- Custom ROM ICs (font/language data)
- Standard TTL: 7404, 7408, 74157
→ Stores character sets and multilingual fonts
Board 2 – CPU DATA
- 2× DM74181 (ALU)
- N82S09 PROM (microcode/data)
- TTL: 74157, 74180, 7495
→ Arithmetic/logic processing core
Board 3 – CPU CONTROL
- Intersil PROMs (5300/5320/5331 series)
- TTL: 74161, 7442, 7430
→ Microcode control & instruction sequencing
Board 4 – Character Generator
- Character ROMs (bitmap fonts)
- 74LS195, 74161, 74157
→ Converts data into display/printable characters
Board 5 – 64K DRAM
- MM5290 DRAM chips
- TTL address/control logic
→ Main system memory (+5V / +12V / -5V)
Board 6 – Memory Interface / Buffer
- 2102 SRAM
- 7495 shift registers, 74157 mux
→ Data buffering & bit-level formatting
Board 7 – Disk Controller No.2
- TTL timing & control logic (7493, 74107)
→ Secondary disk I/O control
Board 8 – Disk Controller No.1
- 2102 RAM buffer
- 74157 mux + LED diagnostics
→ Primary disk controller with buffer memory
Board 9 – D/A & Stepper
- Discrete DAC (resistor network)
- Counters + logic (74193, 7442)
→ Motion control & analog signal generation
Board 10 – LVC Stepper
- 74193 counters, 74107 flip-flops
→ Stepper sequencing & direction control
Board 11 – Font Interface III
- TTL counters, decoders, shift registers
→ Font processing & output interface
Board 12 – Backplane / PCB
- Passive interconnect board
→ System bus & board connectivity
• DM74181 ALU (Arithmetic Logic Unit)
• Intersil 5300 / 5320 / 5331 PROM (Microcode ROMs)
• N82S09 Bipolar PROM
• MM5290 DRAM (64K Dynamic Memory chips)
• PFR8043 Custom ROM IC
⸻
Additional Vintage Components • 2102 SRAM (1K Static RAM)
• SN74193 Up/Down Counter
• SN74161 Binary Counter
• SN7442 BCD Decoder
• SN74157 Multiplexer
• SN7495 Shift Register
⸻
Supporting Logic • SN7400 NAND Gates
• SN7404 Inverters
• SN7408 AND Gates
• NE555 Timer IC
---
System Summary:
Complete 1970s TTL-based computing/printing system with CPU (ALU + microcode), RAM, ROM, disk control, character generation, and motion control.
From Varityper 560 systemPlease PM me if interested or if you have any questions. I can provide more detailed photos of specific chips upon request.
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