CROMEMCO公司的System Ⅰ,Ⅱ,Ⅲ等都是多板微型计算机系统
Cromemco System III是我国最早引进的微机（这里讲的微机和PC有概念上的不同，微机是指采用单芯片微处理器的计算机系统，PC是指个人电脑，Cromemco System III是多用户系统），这个计算机系统用Zilog公司的Z80做CPU（80年代的工科大学生都会Z80的汇编），内存只有64K，没有硬盘，用8寸软盘，运算速度奇慢，100多行代码的作业程序要编译10多分钟。就这样一个简陋的计算机居然可以运行一个Unix的变种—Cromix，而且还是多用户系统，真是奇迹。但使用起来，Cromix和Unix不是很像，甚至于连操作系统命令都不一样。
简介编辑本段回目录
Eventually CROMEMCO needed space to receive visitors, and moved out of the dorm to Mountain View, and incorporated in 1976. Early products were cards for the S-100 bus, as used by the Altair and IMSAI computers.
These computers were built around the S100 bus. The S100 BUS was a standard (also known under the name IEEE 696) for connection on Zilog Z80 or Intel 8080 processors. A lot of S100 cards were available for the Cromenco systems.
Four Cromenco systems were available :
- System 0: Z80 A + RAM 64 KB + 2 floppy disk drives (390 KB each),
- System I: As system 0 + 1 hard disk (5 MB).
- System III: Z80 CPU, Dual 8" Persci electrically driven floppy drives, 64 KB RAM. It was S-100 bus, Multiuser, used MP/M operating system.
In 1982, Cromemco also introduced the CS-1H system using a dual processor board (Motorola 68000 and Z80) and offering 16 MB of address space.
For the moment, we don't know exactly the specific features for the Systems II and IV.
These systems ran under Cromix (the Cromenco Unix version). They could run under CP/M and CDOS too (CDOS is a CP/M like operating system). Several languages were developped especially for these computers : Fortran IV or a 16 K Z80 Basic wich was given as "one of the fastest and most capable. Full 14-digit precision".
主要参数编辑本段回目录
 |  |
| NAME | System I / II / III |
| MANUFACTURER | Cromemco |
| TYPE | Professional Computer |
| ORIGIN | U.S.A. |
| YEAR | 1976 |
| CPU | Z80 |
| RAM | 32 KB (up to 512 KB with a pagination mechanism) |
| ROM | Unknown |
| TEXT MODES | Unknown |
| GRAPHIC MODES | 754 x 482 monochrome / 377 x 241 16 colors. A special video card was available with 3 video processors which allows the same resolutions but respectively with 8 and 4096 colors. |
| I/O PORTS | 8 bit ADC or DAC, Centronics, Disk controller, S100 Bus, 21-card-slot |
| BUILT IN MEDIA | Varies according the model |
| OS | CP/M |
参考文献编辑本段回目录
http://www.old-computers.com/museum/computer.asp?st=1&c=113
http://oldcomputermuseum.com/cromemco_sys1.html
http://oldcomputermuseum.com/cromemco_sys1.html
