![\"Heathkit](\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20251020_172408556-scaled.jpg\")
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- Manufacturer<\/strong>: Heathkit<\/li>\n
- Release Date<\/strong>: 1977<\/li>\n
- Type<\/strong>: Desktop Computer<\/li>\n
- Cost at release<\/strong>: USD $379 (CAD ~$2,000 adjusted for inflation)<\/li>\n
- MIPS<\/strong>: 0.05 (~50 KIPS)<\/li>\n<\/ul>\n
Hardware Specifications<\/span><\/span><\/h3>\n
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- CPU<\/strong>: Intel 8080A microprocessor running at 2 MHz<\/li>\n
- Memory<\/strong>: Configurable from 4 KB to 64 KB RAM (typically 4 KB included)<\/li>\n
- Bus architecture<\/strong>: Proprietary 50-pin “Benton Harbor Bus” with 10 card slots (8 full-length usable)<\/li>\n
- Display<\/strong>: 9-digit 7-segment LED display on front panel<\/li>\n
- Input<\/strong>: 16-button octal keypad on the front panel; optional full keyboard terminals available<\/li>\n
- Storage<\/strong>: Optional cassette tape interface; optional floppy disk drive (e.g., WH17 floppy controller with 102K bytes capacity)<\/li>\n
- Power<\/strong>: Built-in heavy-duty power supply distributing unregulated +8V and \u00b118V to cards which individually regulate to needed voltages (+5V, \u00b112V)<\/li>\n
- Expansion<\/strong>: Slots for memory and I\/O expansion cards; serial and parallel I\/O options<\/li>\n
- Physical dimensions<\/strong>: Approximately 406 mm (W) x 445 mm (D) x 165 mm (H)<\/li>\n
- Weight<\/strong>: Approximately 9.5 kg (about 21 lbs)<\/li>\n<\/ul>\n
Operating System & Programming Languages<\/span><\/span>\u00a0<\/span><\/h3>\n
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- Operating System: <\/strong>HDOS (Heath Disk Operating System), a proprietary disk operating system developed by Heath Company specifically for the H8.<\/li>\n
- Supported Languages<\/strong>:\n
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- Assembly Language for Intel 8080, allowing low-level hardware control and efficient code<\/li>\n
- BASIC, a widely used high-level language for beginners and rapid development<\/li>\n
- FORTRAN, used for scientific and mathematical programming<\/li>\n
- Pascal, for structured programming practices<\/li>\n
- CP\/M programs were still available and runnable on the H8 because the platform could be expanded and configured to support CP\/M as well, given certain hardware modifications.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
Notables<\/h3>\n
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- Proprietary “Benton Harbor Bus”: Unlike the widespread S-100 bus, the H8 used a unique 50-pin bus named after Heathkit’s hometown of Benton Harbor, Michigan, designed to correct electrical flaws in the S-100 design.\u200b<\/li>\n
- The H8 featured an unusual octal keypad and 7-segment LED display rather than binary switches or hexadecimal input, requiring three digits (0-7) for each 8-bit value entry.\u200b<\/li>\n
- The H8 was Heathkit’s first computer kit, announced in July 1977 at the first annual PC Show in Atlantic City and released that fall.\u200b<\/li>\n
- Modular design: The front panel itself was a plug-in card inserted into the first bus slot, making the H8 almost entirely modular.\u200b<\/li>\n
- Gordon Letwin connection: HDOS, the H8’s operating system, was written by Gordon Letwin, who later became chief architect of Microsoft’s OS\/2.\u200b<\/li>\n
- “Love H8 Relationship”: The H8 earned this punny nickname among enthusiasts due to its challenging assembly and quirks.\u200b<\/li>\n
- Golden Age: Released during the “Golden Age” of personal computing (late 1970s-1982), competing with the Apple II, TRS-80, and Commodore PET.\u200b<\/li>\n
- SEBHC preservation: The Society of Eight-Bit Heath Computerists (SEBHC) actively preserves and upgrades H8 systems, including modern enhancements like speech synthesis boards and expanded memory.<\/li>\n
- Bridging early homebrew microcomputers and more user-friendly desktop systems, surviving as a pioneer during the “Golden Age” of personal computing alongside early all-in-one desktop rivals like the Apple II and TRS-80. The H8 garnered a loyal following with nicknames like the “Love H8 Relationship,” due to its assembly challenges.<\/li>\n<\/ul>\n
- Supported Languages<\/strong>:\n
- Memory<\/strong>: Configurable from 4 KB to 64 KB RAM (typically 4 KB included)<\/li>\n
- Release Date<\/strong>: 1977<\/li>\n