Intel SDK-85
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The Intel SDK-85 was a pioneering single board computer introduced by Intel in 1977 as part of their System Development Kit series. It was designed to showcase and facilitate development for the Intel 8085 microprocessor.
Key Specifications
- Processor: Intel 8085A running at 3 MHz with a 1.3 μs instruction cycle
- Memory:
- ROM: 2 KB expandable to 4 KB (using 8355 or 8755)
- RAM: 256 bytes expandable to 512 bytes (using 8155)
- I/O:
- 38 programmable parallel I/O lines (expandable to 76 lines)
- Serial interface through SID/SOD pins of 8085
- Display: 6-digit 7-segment LED display
- Input: 24-key hexadecimal keyboard
- Interfaces:
- TTL-compatible bus
- 20 mA current loop for teletype (110 baud)
Historical Significance
The SDK-85 played a crucial role in the microcomputer revolution of the late 1970s and early 1980s by:
- Providing an accessible platform for engineers and students to learn about microprocessor-based systems
- Demonstrating the capabilities of the 8085 processor and associated chip family
- Serving as a prototyping tool for developing more complex 8085-based systems
Its influence extended to educational institutions and the US military, where it was widely adopted for training and educational purposes
Donated by: Arlen Michaels