Compaq TC1000 Restoration
I obtained the tablet from eBay in late March 2021. Came complete with keyboard, case, and a power supply. Boots into Windows XP Tablet Edition. Internet Explorer won't load most web sites and it would be a bad idea to use it anyhow. The battery does not seem to be charging.
Can I Expand the Memory?
There is one easily-accessible RAM (204 pin SO-DIMM) module that you can reach through a panel in the back. There is another 256MB module (200-pin SO-DIMM) buried under the motherboard and it is a chore to access it. Obtained three different replacements (512MB, 1GB) for the 256MB module, but the computer would not boot with them. It's possible that the maximum RAM size for this machine is 768MB.
I managed to short the board while testing different memory modules. Fortunately, it only took out a small cable connecting the power switch assembly to the motherboard, and I was able to obtain a replacement.
Power Supply Shenanigans
After a time, the power supply burned out. I pulled a Targus Universal Charger out of storage and attached a tip that supplied the same voltage (15V) as the power supply. A week later I realized that the TC1000 wants the more common 19V and switched to the correct tip. That explains why the battery hadn't been charging!
Attaching an SSD
Ordered a 128 mSATA SSD card and an IDE to mSATA adapter, and used old versions of gparted live (0.24.0-2-i586) to set up partitions and clonezilla (clonezilla-live-2.4.2-61-i586) to copy the old version of Windows to a partition on the SSD. Newer versions of these utilities required either an i686 CPU or an i586 with PAE. While the Transmeta Crusoe is roughly equivalent to an early Pentium, the the Transmeta Crusoe does not support CPU capabilities needed by modern software.
Replacing the WiFi Card
Picking a Linux Distribution - Gentoo
I had been going through a lot of trial and error to find a Linux distribution that would install well on this machine. It is a challenge to find a Linux that will run on a 586-compatible without PAE or SSE2. I was able to get a few distributions to install, but many programs (including Firefox) would fail with an "illegal instruction" error. In order to expedite testing, I started using QEMU with these flags to approximate the limitations of this computer: -cpu pentium,+cmov. But in the end, Gentoo turned out to be the best bet, because everything is built from source.
With a CPU of this vintage, it would not be practical to compile all the binaries using the laptop itself. So I set up a virtual machine on another computer using VirtualBox, booted from the Gentoo x86 boot disk, and used a USB to IDE enclosure to mount the hard drive so I could perform the installation. Then I followed the instructions in the Gentoo X86 Installation Handbook, with changes to that process noted below, so be sure to read the following sections before you start the installation.
This is not a UEFI Machine
As you go through the Gentoo X86 installation handbook, you will occasionally find instructions for both UEFI and MBR-based systems. The TC1000 is MBR, so be sure to use the MBR instructions.
Configuring Portage (make.conf)
I used the following COMMON_FLAGS in /etc/portage/make.conf:
COMMON_FLAGS="-march=i686 -Os -mmmx -pipe -fomit-frame-pointer"
If you are using a virtual machine to do the initial install, you might want to set your MAKEOPTS to -jN (replace N with the number of processor cores you want to use for parallel compilation). But when you put the hard disk back into the Compaq TC1000, be sure to comment it out or set it back to -j1 since it has only one core. If you are planning to install X11, you can add these to make.conf as well:
When it came time to select a profile, I went with default/linux/x86/17.0/systemd, which is a minimal, systemd-based configuration that works as a good starting point.
Mask Some Packages to Avoid SSE2 Dependency
Even with compiling everything from source, I ran into a few dead ends that prevent me from running much modern software. There is a ton of stuff that relies on the rsvg library, which itself relies on the Rust programming language. There is a hard dependency on the SSE2 instruction set extension in Gentoo's Rust package. See this post for more details. You can force Gentoo to use an older version of rsvg that does not require Rust by creating the file /etc/portage/package.mask/librsvg with the following contents, which will mask all versions greater than 2.40.21
You should also completely mask rust, with the file /etc/portage/package.mask/rust with the following contents:
nodejs has the same problem (see this post). This will prevent you from installing most web browsers. I could not find a version that would build, so I masked it going back all the way to the oldest-available version with a /etc/portage/package.mask/nodejs containing the following:
Systemd or OpenRC?
I also opted to use systemd init instead of the default openrc. For some reason, I ran into more SSE2 dependencies with openrc than with systemd. The Gentoo installation instructions will eventually direct you to this page for details on installing Gentoo with systemd instead of openrc. But until you reach that point (as of this writing, this is where that happens), follow the X86 Installation Handbook.
However, because you won't be booting into a systemd-based system until later, you'll need to wait until after you've installed the bootloader to follow the Configuration section of the systemd article. That's because the Live CD installation image uses openrc.