Heathkit的H8是英特尔8080型微机包的形式销售在1977年开始。类似的H8的S - 100总线计算机的时代，像这些机器经常使用的CP /上软盘m工作系统。之间的H8和仛主要区别- 100机是巴士;的H8采用了50针总线设计，是更小，更强大和更好的电气工程。
该机器还包括一个引导ROM的更容易启动，包括运行基本输入/输出，并允许通过前输入安装16进制键盘而不是像牛郎星8800开关机所使用的代码。该H8是一次成功的设计，而是需要一个单独的终端。
主要参数编辑本段回目录
| Announced: | July of 1977 |
| Available: | Fall of 1977 |
| Price: | $379 (0K RAM) |
| CPU: | Intel 8080A @ 2.0 MHz |
| RAM: | 4K-64K |
| Interface: | 16-button keypad |
| 9-digit LED display | |
| Storage: | optional audio cassette |
| or floppy drive (1978) | |
| OS: | HDOS (Heath DOS) |
 |  |
| NAME | H8 |
| MANUFACTURER | Heathkit |
| TYPE | Professional Computer |
| ORIGIN | U.S.A. |
| YEAR | September 1977 |
| END OF PRODUCTION | Unknown |
| BUILT IN LANGUAGE | Octal editor |
| KEYBOARD | 16--key Octal |
| CPU | Intel 8080 A |
| SPEED | 2.048 MHz |
| RAM | 256 bytes (upgradable with memory boards) |
| ROM | 1 KB in basic version |
| TEXT MODES | N/A - Small display on the front panel displays the registers content. |
| SOUND | Built-in speaker |
| SIZE / WEIGHT | Unknown |
| I/O PORTS | Serial IO (H8-4) and Cassette Interface (H8-5) |
| BUILT IN MEDIA | Optional ECP-3801 Cassette Recorder / Player |
| OS | HDOS, CP/M with extended system |
| POWER SUPPLY | Built-in power supply unit |
| PRICE | From $499 |
详解编辑本段回目录
Heathkit's H8 was an Intel 8080-based microcomputer sold in kit form starting in 1977. The H8 was similar to the S-100 bus computers of the era, and like those machines was often used with the CP/M operating system on floppy disk. The main difference between the H8 and S-100 machines was the bus; the H8 used a 50-pin bus design that was smaller, more robust and better engineered electrically. The machine also included a bootstrap ROM that made it easier to start up, including code for running basic input/output and allowing input through a front-mounted hexadecimal keypad instead of the switches used on machines like the Altair 8800. The H8 was a successful design but required a separate terminal. A successor model, the Heathkit H89 was developed which combined a Z-80 processor board with the Heathkit H19 terminal and a floppy disk drive into one case. This model also was sold in fully-assembled form as the WH89. These were later sold by Zenith Electronics with their name on the front and sold it as the Zenith Z89.
Although the H8 was relatively inexpensive at $379, the stock H8 included only the chassis and the CPU card. At least one H8-1 memory board with 4K of RAM ($140) must be installed to run any appreciable software programs. To use an audio cassette drive for data storage, the H8-5 Serial I/O card ($110) must be installed. To upgrade to the floppy drive system, at least 16K of RAM must be installed.
For reliability, the CPU board came pre-assembled, but everything else was available in kit form. In 1978 the H-17 dual-floppy drive ($675) became available - previously only an audio cassette recorder could be used for data storage.
Two years after the H8, Heathkit released the Heathkit H89 "all-in-one" computer.
For reliability, the CPU board came pre-assembled, but everything else was available in kit form. In 1978 the H-17 dual-floppy drive ($675) became available - previously only an audio cassette recorder could be used for data storage.
Two years after the H8, Heathkit released the Heathkit H89 "all-in-one" computer.
| 1977, 1978 Heathkit prices | ||
| part number | description | price |
| H8 | Heathkit computer kit | $379 |
| WH8 | H8 assembled and tested | $475 |
| H8-1 | 8K static RAM board (4K installed) | $140 |
| H8-2 | Parallel ports PCB w/ 3 ports | $150 |
| H8-3 | 4K of static RAM chips for H8-1 board | $95 |
| H8-5 | Serial I/O and cassette interface (1200 baud) | $110 |
| WH17 | Floppy drive system - includes one drive and I/O card, requires 16K RAM | $675 |
| H17-1 | Additional floppy drive for WH17 | $295 |
| H17-2 | Package of five 5-1/4 inch diskettes | $25 |
| H8-17 | Disk Operating System software | $100 |
参考文献编辑本段回目录
http://oldcomputers.net/heathkit-h8.html
http://en.wikipedia.org/wiki/Heathkit_H-8
http://www.old-computers.com/museum/computer.asp?st=1&c=134
http://en.wikipedia.org/wiki/Heathkit_H-8
http://www.old-computers.com/museum/computer.asp?st=1&c=134
