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The Alpha-Top Green753 is a 3-Spindle Pentium 1-based generic/ODM laptop released in 1996. It was sold under a number of brands by local-market distributors, including Jetta, Cyberstar, ARM Computer, Brick/Ergo, Trogon, Maxtech, and others.

CPU Support

The G753 uses standard Socket 7 CPUs. It supports as slow as a Pentium 75 and as fast as a Pentium 200, although 200MHz Pentiums will report improperly as 166MHz in BIOS. They will still run at the proper speed. The G753 DOES NOT support any MMX or AMD CPUs. I've heard that these will start up with MMX chips, but the MMX functionality won't work and they won't report properly. They will not POST with AMD CPUs installed.

RAM Support

The G753 has two 72-pin slots that support up to 40MB FPM RAM. EDO RAM will not work. 84-pin FPM memory will work properly if the RAM sticks or sockets are modified so they will fit.

PSU

The G753 uses a proprietary 4-pin power supply. The proper shipping supply is made by Asian Power Devices Inc., model APD-9510-19A. Images of this supply are up on the gallery page. It appears to use the extra pins for battery charge, which was fairly common in the early 90s, but not by 1996. If you don't care about battery charge, you can probably use a standard 19V supply if you get the pinout and find the right plug.

HDD Adapter

Avoid buying a Green753 that doesn't come with the HDD caddy and adapter. Like most laptops, while the HDD itself is IDE, it plugs in through a proprietary interposer/adapter that's specific to this laptop and maybe the Green753+. If it doesn't come with the adapter, you won't be able to plug in a hard drive.

Specifications

CPU: Standard Socket 7 - Supports up to a 200MHz* non-mmx Pentium.
RAM: 2x 72-pin slots - FPM ONLY, up to 40MB
Hard Disk: up to 8GB - anything higher WILL NOT WORK with the BIOS.
HDD Type: 2.5" IDE
Proprietary HDD Adapter: Yes
Display: DSTN Passive Matrix Color or TFT Active Matrix Color, 800x600
GPU: Cirrus Logic 7543
VRAM: 1 or 2MB
Audio: ESS 1788 PnP AudioDrive
Operating System (Shipping): Windows 95
Main Battery: NiMH
CMOS Battery: VARTA 3-cell NiMH Battery (Soldered)
Power Supply: External 4-pin proprietary, Asian Power Devices APD-9510-19A or ILAN F1560.
Internal Drives: CD-ROM, Floppy
Expansion: 2x PCMCIA, Expansion dock connector
I/O (Front): 3.5" 1.44MB Floppy Drive
I/O (Right): Battery bay, CD-ROM drive
I/O (Rear): IR, DC Jack, Serial, Parallel, Game Port, VGA, Dock Port
I/O (Left): Composite Out, PCMCIA x2, PS/2, 3x Audio Jacks, HDD Bay
BIOS: Phoenix

*see CPU Support section

Jumper Configs

Sourced from orphanlaptops.com

Block 1 (SW1) - CPU Speed

Speed (MHz)	SW1-1	SW1-2	SW1-3	SW1-4
75	OFF	OFF	OFF	OFF
90	OFF	ON	OFF	OFF
100	ON	ON	OFF	OFF
120	OFF	ON	OFF	ON
133	ON	ON	OFF	ON
150	OFF	OFF	ON	OFF
Also 150(?)	OFF	ON	ON	ON
166	ON	ON	ON	ON
200	ON	ON	ON	OFF

Block 2 (SW2) - Unknown

The following settings are correct for all Green753s. I'm not sure what this one was actually for, but don't mess with it.

SW2-1	SW2-2	SW2-3	SW2-4	SW2-5	SW2-6	SW2-7	SW2-8
ON	ON	ON	ON	ON	ON	OFF	OFF

Block 3 (SW3) - CPU Core Voltage

Voltage	SW3-1	SW3-2	SW3-3	SW3-4
2.9v	ON	ON	OFF	OFF
3.1v	ON	OFF	OFF	OFF
3.3v	OFF	OFF	ON	OFF

Page last updated (MM/DD/YYYY): 05/01/2024
Update Reason: backnav updated

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