Heathkit H89
Heathkit H-89(1979)
如果在70年代你想拥有一款不错的机器，你肯定会想到Heathkit H-89，这款售价为1800美元的电脑可和用户的彩色电脑连接起来。它不仅能够运行H-DOS，同样也能运行CP/M，且带有一个90KB的软盘驱动。
1979年，health company 的Heathkit H89 电脑，它们对消费者市场的把握具有很强的前瞻性，比如这张当年的宣传页，会让人很容易联想到科技、生活、健康、财富的关系。消费者会有购买的冲动——尤其是男人。把电脑摆在海滩——证明自己多么的有城府。
这个计算机在设计的时候，还故意采用客人组装的方式。卖给消费者一堆零部件，然后客人根据图纸组装起来。增加了乐趣，也让女孩子们因为男孩子的“高智商”的举动而倾心。其实3岁小孩也能组装起来 :p .人性和科技一旦结合，市场价值马上闪现。
Heathkit H89一体式计算机，1979年编辑本段回目录
Heathkit H89一体式计算机
H89一体式计算机有两个型号--供购买者自行组装的H89、经过组装和测试的WH89，H89的配套软件包括HDOS磁盘操作系统、汇编程序、文本编辑器和微软BASIC。听着Walkman在H89上编写软件一定非常惬意。
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。
继承模式，Heathkit H89已制定出结合Heathkit H19码头和软盘驱动器在一个案件一个Z - 80处理器板。也是在完全组装为WH89方式出售该模型。
简介编辑本段回目录
It originally came with 16 KB of memory, later versions provided up to 48KB on the main CPU board (in groups of 1 KB chips). Zenith and Heathkit offered a 16 KB expansion card ($120) for a total of 64 KB when using CP/M.
The system was identical to the H-19 video terminal but had an additional CPU board between the CRT and the terminal board. (Really identical because Heath offered upgrade kits to convert an H-19 to an H-88/H-89 computer).
It used hard sectored disks with a built-in card controller. Under either H-DOS or CP/M, disk capacity was of 90 KB. Another model the H-88 was identical to the H-89, but did not include the floppy drive or controller. It had a cassette port.
A couple of years later, the H/Z-37 soft sectored controller and ROMS came out, then was replaced with a double 5.25" floppy disk drive called H/Z-87 (102 KB, 250 ms). A double 8" floppy disk drive called H/Z-47 (1 Mb each) and a hard disk called H/Z-67, it contained one 10MB 8" winchester drive and one 8" floppy drive (like the one in the H/Z-47).
It ran under HDOS or CP/M (the operating system used 16 KB of RAM).
HDOS was originally written for the H-8, it ran without modification on the '89. This was a single-user OS written by J. Gordon Letwin for Heath. It included a Basic interpreter and assembler.
For CP/M, H/Z wrote a custom BIOS in assembler that the new user could further customize for his specific hardware and assemble right on the machine.
A version of MP/M was also available for the system.
A lot of extension boards were available for this computer including 64 KB memory boards, hard-disk controller cards, 3-port serial I/O board, H19 terminal board, etc.
A third party small upgrade card was also offered which doubled the processor speed to 4 Mhz.
An assembler/debugger was given with the DOS. A paper tape reader was available as well. Microsoft has adapted its various programming languages (Basic, Fortran, Cobol) for this computer. Borland also offered a version of Turbo Pascal that worked great with the CP/M.
主要参数编辑本段回目录
NAME H-89
MANUFACTURER Heathkit / Zenith
TYPE Professional Computer
ORIGIN U.S.A.
YEAR 1979
END OF PRODUCTION 1983
BUILT IN LANGUAGE None
KEYBOARD Full stroke keyboard with numeric keypad
CPU Zilog Z80
SPEED 2.048 MHz
RAM From 16 KB up to 64 KB
ROM Custom bootup & monitor
TEXT MODES 80 chars. x 24 lines ( + one independant line)
GRAPHIC MODES No graphics mode. 33 graphic characters
COLORS Monochrome green phosphore display
SOUND Beep - HUG magazine had a article on how to use one of the serial ports as a crude
I/O PORTS RS232 (two, up to six), Centronics, IEEE 488
BUILT IN MEDIA 90 KB floppy drive
OS HDOS, CP/M, MP/M
POWER SUPPLY Built-in power supply unit
PRICE $1,800 as kit in 1979 w/ 1 floppy drive 
 |  |
| NAME | H-89 |
| MANUFACTURER | Heathkit / Zenith |
| TYPE | Professional Computer |
| ORIGIN | U.S.A. |
| YEAR | 1979 |
| END OF PRODUCTION | 1983 |
| BUILT IN LANGUAGE | None |
| KEYBOARD | Full stroke keyboard with numeric keypad |
| CPU | Zilog Z80 |
| SPEED | 2.048 MHz |
| RAM | From 16 KB up to 64 KB |
| ROM | Custom bootup & monitor |
| TEXT MODES | 80 chars. x 24 lines ( + one independant line) |
| GRAPHIC MODES | No graphics mode. 33 graphic characters |
| COLORS | Monochrome green phosphore display |
| SOUND | Beep - HUG magazine had a article on how to use one of the serial ports as a crude |
| I/O PORTS | RS232 (two, up to six), Centronics, IEEE 488 |
| BUILT IN MEDIA | 90 KB floppy drive |
| OS | HDOS, CP/M, MP/M |
| POWER SUPPLY | Built-in power supply unit |
| PRICE | $1,800 as kit in 1979 w/ 1 floppy drive |
