Continued from previous post, overview & background on the Compaq Portable 486 <<<

Setting up the Compaq Portable 486 is a bit of a hassle in a similar way to the Compaq Portable 386 – it does not have a BIOS – meaning that it relies on a floppy based program to make configuration changes. These settings are stored by a Dallas RTC chip which typically has run flat by 2019. Fortunately, the Dallas RTC chip is socketed (unlike the Compaq clamshell SLT series) meaning it can be easily replaced. What is not so easy, however, is running the setup program – which is mandatory to run after swapping out the RTC chip. Without running setup, you will be presented with error codes and won’t be able to boot to MS-DOS. 

Launch screen of the System Configuration Utility – Those lines on the screen should not be there – my display could probably benefit from a recapping.

Downloading the software and creating a boot disk was a nightmare as there are not that many of these computers still around, meaning that there were not that many posts online about which program (Softpaq) to use to generate the disk. 

Using the software is also not easy – I feel that these Softpaqs were developed for the dealer to use to setup the computer, and not intended for the end user. Check out my video if you are having trouble setting up your Compaq Portable 486. 

Hints: Make sure you pick a Hard Disk to use from the list of drives – the custom disk geometry option does not work – it won’t allow you to save the settings if you try (at least with my unit!)

For Windows 95 you have to disable or change the generic resources of the SCSI CDROM in the setup, else you get BSODs (some sort of conflict between the hard disks and the on-board SCSI CDROM controller) 

The configuration software is slow and clunky by more modern BIOS standards of the late 1990s, but does provide a lot of information – here in the Advanced Menu, you can have it show what resources are available.

Download floppy disk images to configure your Compaq Portable 486 zipped here – you will need to use WinImage to write them to floppy disk (download here for 3.1 / Win 95)

You will need to open your Compaq Portable 486 to access a bank of switches, one of which is used to clear or save the EISA configuration, see the maintenance manual PDF here.

Next Post: Games & Benchmarks on the Compaq Portable 486 >>> (coming soon)

Setting Up The Compaq Portable 486

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