Known Model Numbers: 486E1DX2-66C, 486E1DX4-75C, 486E1DX4-100C
The Jetbook E1 Series laptops are late 486-era machines. All of the information I have on these comes from just three sources - An eBay seller who parted one out, an individual who owns one that sent me information via email, and a bit from Jetta's archived website.
The E2 was only referenced on Jetta's website and I have nearly nothing about it. There's an FCC record from Jetta for an "E586" which is what I'd guess the E2 is. So it likely had either a Cyrix 5x86 or a Pentium in it. The E1 and E2 used the same drivers so they're very similar.
The design of the E1 bears a resemblance to the older SLC and C2 models, which are most commonly seen branded as WinBooks, but the E1 design does look newer. Internally, the E1 supports faster processors, includes a fan, a sound card, and could come with TFT/Active Matrix displays.
The Jetbook E1 unfortunately uses a proprietary 4-pin power connector. The charger likely output two voltage rails - one for running the computer and another for charging the battery. The connector is the same as the one that the Alpha-Top Green753, Green755, and several Nan Tan laptops used, but the voltage and pinout is different. The E1 needs 18V, and according to the person I was speaking with over email, the TOP LEFT pin on the laptop is ground. The Alpha-Top supply is 19V, which is close enough, but the pinout is different. The Nan Tan supply may or may not have the same pinout, but the voltages are likely too far off for it to work. The main rail is 20V which would probably work, but the battery rail is 25V which would likely fry something in the E1.
At this time I do not know what the proper charger for this computer is, and I will not know until one shows up for sale with the charger. I looked for a long tume, but could not find any power supply for sale with that connector that outputs 18V.
I do have drivers for this laptop linked on the resources page, as Jetta had them up on their FTP server.
Image from Libin Zhang
| Spec | Details |
|---|---|
| CPU Options | - Intel 486DX2 @66MHz - Intel 486DX4 @75 or 100MHz - Other options were likely available. |
| Chipset | Unknown |
| RAM | Unknown |
| Hard Disk | - 2.5" IDE - 814MB Toshiba drive standard, other options were likely available. - Does not use a proprietary adapter or cable. |
| Display Options | - Passive Matrix Color @640x480 - Active Matrix Color @640x480 (GoldStar) |
| Graphics Processor | Chips & Technologies 655 Series |
| Audio | - ESS 688 AudioDrive - Mono Speaker |
| Main Battery | - NiMH 10-cell 4/3A 12V 2600mAH - P/N 790512699A |
| CMOS Battery | VARTA 3-cell NiCad |
| Power Supply | External 18V 4-pin proprietary |
| Disk Drives | 3.5" 1.44MB Floppy Drive |
| PC Cards | PCMCIA, I think only 1 slot |
| Networking | Internal Modem with 2 ports |
| Other I/O | - 1x PS/2 - 1x VGA Out - 1x Parallel - 1x Serial - 1x Expansion Bus - 2x Audio Jacks |
| BIOS | Unknown |
| Pointing Device | Trackball |
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