TSU Meeting MONDAY — December 1, 2025

David, Adam, Ryan, Gustavo, Jeff, Mowgli, Paul, Peyton, Francois

Most of the meeting was a long, slide-driven walkthrough by David of how the TS2068 was developed, drawn from Lon Hildreth's preserved notebook and internal Timex documents. He traced the team that built it — Lou Gailey, Lon Hildreth, Will Column and Dave Boyle (recruited from Burroughs), Kirk Pond and Rex Naden (from Texas Instruments), case designer Gary Grimes, hardware lead Mike Brannigan (from Sperry), BCS/community liaison Sue Mahoney, and marketing VP Danny Ross — and laid out a month-by-month timeline from Timex receiving the ZX Spectrum ROM source on 23 November 1982, through the re-skinned 'TS2000' demoed at January 1983 CES, to the final TS2068 industrial design, the May 1983 third-party software guide, the June software-engineering release levels, August shipment to distributors, and the November 1983 retail launch.

Several specific finds came out of Lon's papers. The ZX Spectrum ROM source listing (dated 11-23-1982) had never previously been public, and David has now posted it on archive.org. The name 'TS2068' comes from Danny Ross misspeaking '2072' (RAM+ROM) at a press conference and deciding it 'sounded better.' A late-discovered showstopper was the function-dispatcher bug — the in-RAM jump table meant to give software a stable ABI didn't work for machine code running from a cartridge, which threatened Timex's whole cartridge strategy. Lon spent September 1983 onward on a CPM port: CPM wants RAM at address 0, conflicting with the 2068's ROM and RST 8 error-handler, so the plan was a 32K bank in the planned microdrive interface that would map into the lower 32K. He flew to Digital Research in Monterey in late November; missing deliveries from DRI slipped the CPM target from end of January 1984 to 30 March 1984 — past Timex's 22 February 1984 exit from the computer business. Gustavo and David also debated TMOS (the Timex Microdrive Operating System): it started from the Sinclair Interface 1 source, but Timex added random-access files and CPM-supporting features the Interface 1 ROM did not have. After Danny Ross was let go on 5 December 1983, Carol Corcoran wrote the 40-column code and (with Dave) the 80-column code; Mike Brannigan and Carol Corcoran compiled the technical manual after Timex shut down.

The second half turned to why the 2068 failed commercially. The group discussed Timex's decision to differentiate rather than ship a Spectrum-compatible machine (the Chameleon ROM cartridge was their fallback), the late and never-shipped mass-storage story, the 1983 video-game crash, and Timex's own role in tanking the low-end market by pricing the TS1000 at $99. Ryan argued the killer issue was the lack of a real software library at launch rather than mass storage per se; others noted the Portugal operation was small and already running before the US shutdown, so moving everything overseas wasn't realistic.

David then announced he has sent a survey to the groups.io list to gauge interest in which 2026 Vintage Computer Festivals members want to attend together (East/NJ, Midwest, West, Southeast, Southwest, Montreal) following the well-received VCF Midwest trip in September. Mowgli flagged the non-VCF Indie Classic in Indianapolis in March as another worth adding. Adam put in a standing request for a future short presentation on the TS2068's high-color mode, prompted by the 1984 Frogger thread on the list. The next meeting is Sunday 21 December at 2 pm Eastern (the holiday/eggnog meeting); Peyton is working on a holiday program to show.

Highlights

ZX Spectrum ROM source listing dated 11-23-1982, preserved by Lon Hildreth, has been posted to archive.org — first public release
The name 'TS2068' came from Danny Ross misspeaking '2072' at a press conference and saying it sounded better
Lon's notebook documents a late-1983 CPM port plan using a 32K bank in the unreleased microdrive interface mapped into the low 32K
August 1983 showstopper: the function-dispatcher jump table did not work for cartridge machine code, undermining the cartridge software strategy
David has sent a 2026 VCF survey to the list (East/Midwest/West/SE/SW/Montreal) and is leaning toward presenting at VCF East

Topics: TS2068 / TC2068 · Prototypes & rarities · Cartridges, EPROM & dumping · CP/M · Tape & library archiving (TAP/TZX) · User group meetings & events

Summary generated from the meeting recording; the full transcript is kept in the group's private archive.