Tektronix TLA5202, "for parts or not working; screen flashes on boot, external monitor works.".... $150.
Fix: Change bios primary boot device from AGP (external video card) to PCI (internal LCD).
Yay.
*EDIT*: This appears to have the 2M memory option... now time to disassemble, back up the factory drive, and then see what fun I can have with this. The unit itself has one damaged BNC connector on the front ("External signal out"); it appears functional, just looks like someone bent part of the outer ring and then snipped the bent part off with shears so they could fit a BNC on it again. Hoping this will help me troubleshoot the Valhalla 2701C I've been working on.
... although I'm going to have a hard time resisting trying to upgrade this 5202 first.
... 120GB SSD, 4GB of memory ordered for this, replaced the CMOS battery which was flatter than a pancake. Unit appears to be in very good shape; some of the torx were tight enough that I wonder if it's ever been opened. BIOS log suggests it was used from 04 through 08, once in 2012, and then idle/flat battery. Wonder if the thing got tossed to the side because the CMOS battery went dead and the BIOS defaults to AGP output instead of the internal PCI/LCD screen!
*EDIT2*: This was too easy... So, I'm currently reformatting the factory drive, without a backup, and installing windowsXP to try to get the latest TLA software on this one. Wheeee.