The SX/DX 64 is the "laptop version" (though hardly portable) of the C64. This computer has a built-in 5" color screen (just about enough for the eyes), a detachable keyboard with new functions, and one or two 5.25" floppy disk drives (the famous 1541), depending on the model.
The DX-64 and the SX-100 (SX-64 with black & white monitor) were first announced in January 1983 but the SX-100 never made it to the shelves and was replaced by the SX-64 later that year.
One important feature is that the SX/DX-64 lacks a cassette interface ! People who upgraded from the classic C64 couldn't play their games stored on tapes ! Some programs that used the tape buffer for storage (of sprites say) had problems too.
The cartridge slot is found on top of the case, and there is a sound speaker inside the unit (unlike the C64).
The DX-64 has the same characteristics as the SX64 except its two 5.25" floppy disk drives instead of one. A very small quantity was produced. It was probably never sold but only used by Commodore insiders.
The SX64 and DX64 computers never had success, probably because of higher selling prices, but were known as the world's first color portables.
The SX64 was not the only machine that Commodore made in this chassis, there was also the SX500, which was an Amiga in the SX case (see 'More pictures').
As the world's first portable color computer, the SX-64 was designed to be a portable Commodore 64, with a built-in 5-inch color monitor, 5-1/4 inch floppy drive, and power supply.
Although heavy at 23 pounds, it is a very nice and sturdy system. Almost 100% compatible with the C64, it runs all cartridges and floppy based programs. The only thing missing is the cassette port, which is a minor consequence. While the Commodore 64 was an extremely popular computer, the SX-64 didn't even come close. Probably because it cost twice as much, and has a small 5" (diagonal) screen. Although it is considered a portable computer, you still have to plug it into the 110VAC power outlet, there are no batteries to run it.
As this early magazine advertisement indicates, the SX-64 was originally designed for two floppy drives, but apparently the system lacked sufficient power to run two drives at the same time.
1989年9月,苹果公司面向用户推出了第一款笔记本电脑。它采用了68HC000处理器,这是Motorola68000的低电压版本,运行频率为16MHz。内存为1MB,内置了40MB的SCSI硬盘。这款笔记本采用的显示屏依旧为10寸单色液晶显示器,分辨率为600 X 400。当然也正因为性能卓越,这款笔记本的价格十分高昂。
同年,英特尔正式开始留意笔记本电脑专用 CPU 的研制。当时台式机的 CPU 都是采用 0.8 微米制造工艺生产的,笔记本电脑 CPU 就是在这个时候采用了 0.35 微米制造工艺生产,电压也因为英特尔采用 VRT 技术而降到 3.3V ,也是从这时开始笔记本电脑的 CPU 才真正地与台式机 CPU 划清了界限。 1997年9月,IBM公司在全球率先推出了配备14.1寸彩色液晶、DVD驱动器的笔记本电脑---ThinkPad 770。在当时,这款机器的问世意味着高分辨率大屏幕时代即将到来。
1998年,Intel公司的移动版PII/Celeron问世,这让笔记本的性能得到了一次质的飞跃。 1999年,AMD Mobile K6-2发布,支持了最新的3DNow!而抛开了与Intel MMX技术的纠葛,性能上开始有了大幅的提升。Intel不甘示弱,Mobile Pentium III取代前一任CPU而再一次将移动版处理的速度提升了一个档次,同时将SSE指令带入了笔记本电脑。到了2001年3月20日,Intel抢先发布1GHz Mobile Pentium III后,将移动处理器和笔记本都带入了GHz时代,CPU的更新速度日新月异的时代开始了。