ZX Spectrum
Sinclair ZX Spectrum (48K/128K), Spectrum Next, and Spectrum-specific hardware/software topics.
152 threads · 983 messages · 2001-11-12 → 2026-06-28
Although this is the TS2068 list, the ZX Spectrum is the constant frame of reference — a 2068 owner is always one ROM swap or one cartridge away from running 48K Spectrum software, so most Spectrum threads here are really about that crossover. The earliest deep dive is the 2007 thread #1001186 (ZX Spectrum 128K vs TS2068): Mark Martin notes the Spectrum-emulator cartridge is a hard-to-find eBay item, while Johnny Red and Luis D'Ardis argue the 2068's extra video modes still win on hardware. Then a long 2009 discussion (#1002185, NTSC Spectrum) digs into whether a real NTSC-output Sinclair Spectrum ever existed — answer: probably not, but the Portuguese TC2048/TC2068 were factory-jumperable between 50/60 Hz, per Paulo Leite, with schematics on Jarek Adamski's 8bit.yarek.pl. The Spectrum emulator cartridge (Jarek Adamski's) gets its own thread #1001785 — OUT 244,3 puts the 2068 into Spectrum mode, then load 48K tape images; Manic Miner, Frogger, and Back2Skool are the recommended first games.
The modern era picks up the same crossover hardware-first. #1003483 (Switchable Timex Sinclair 2068 ROM modification) documents Richard Atkinson's twin-EPROM mod that puts the Spectrum 48K ROM and the original 2068 ROM in HOME/EX sockets and uses the channel 2/3 switch as a ROM selector — he offered it as a service via rga24.blogspot.co.uk, and Don Dindang sells twister boards doing the same thing commercially with selectable ROMs (#1003976). For real Spectrum hardware, Carl Miles's ZX Spectrum 48K Repair thread #5525 (Jan 2024, 65 msgs) is the most detailed single artifact — diagnosing Bill Miller's dead Speccy, recapping, exploring the 14.3181 MHz NTSC-conversion crystal trick Greg Skuza asks about, and demoing the vDrive ZX (SD-card Microdrive emulator) against a real Microdrive. Carl's CZ2000 → TS2000 prototype project (#6840) overlaps heavily: he confirms the Argentine CZ2000 uses a ZX-Spectrum Issue 6A PCB with a 6C001E-7 PAL ULA and the same VHF RF modulator as the ZX81/TS1000, plus a 3.582056 MHz subcarrier for PAL-N.
A distinct sub-thread is the Spectrum Next ecosystem, which most TS2068 list members have at least one of. Greg Bennett, Jeff Burrell, and Greg Skuza unbox their Kickstarter Next 2.0s in #5764 and report on SidNext (AY/YM playback that mimics C64 SID), CP/M support, and how much better the Next looks on a CRT. The follow-on thread #8764 (late 2025) covers how to actually buy a Next in the lull between Kickstarters — answers: N-Go (manuferhi.com), XBerry Pi, and 3D-printed mechanical-keyboard enclosures; the specnext.com forum is the active community; David Anderson notes an extended 2068 core can be implemented in the Next FPGA (#8669, drifted from a C64 thread). Adam Trionfo also surfaced Next Magazine (Fusion Retro Books) and the broader retro magazine library — Crash, ZZAP! 64, Amtix. Separately, The Spectrum from Retro Games (#7340, late 2024) generated less excitement than expected — Josef Jelinek and Jay M warn its keyboard membrane is not compatible with original Speccy rubber-mat replacements (ribbon spacing differs to fit the internal USB-decoder PCB) and that the design squandered the chance to add a 9-pin Atari/Kempston joystick port.
Several threads drift into Spectrum territory rather than being about it. #5664 (TS1000 → TS1500 conversion) drifts to John Lech pointing at the OMNI 128HQ Laptop (zxrenew.co.uk) as a portable Speccy. #5779 (TS2065 Microdrive prototype) drifts to using a real ZX Interface 1 with Ryan's NTSC Spectrum, including format/catalog tests on vDrive ZX. #6293 (Jon's investigation of the ZX Interface 1 RS232) is explicitly a 2068-Speccy crossover design study — Jon documents the IF1's serial port logic with an eye to a switchable Spectrum-mode UART on a TSPico expansion board; the thread also surfaces Randy Kindig's MCLZ8 Teensy-4.1 Z80 drop-in accelerator. The 2026 thread #8888 (Gaming the Iron Curtain) pulls in Eastern-Bloc Spectrum clones — Pentagon 128K, Soviet/Czechoslovak machines — with Josef Jelinek (himself Czech, owns Slovak Speccy clones) offering to answer first-hand questions, and Brett Hallen pointing to his Clueless Engineer YouTube channel. And Josef's GPU-based retro-pixel-converter updates (#9498, June 2026) target Spectrum/TS2068 SCREEN$ output with physically correct color and CRT emulation — used by David Anderson to convert R. Asa Gordon photos into Spectrum-format SCREEN$ files. Recurring people across both eras: Adam Trionfo, Carl Miles, Ryan Gray, David Anderson, Greg Skuza, Jeff Burrell, Josef Jelinek (modern); Paulo Leite, Jarek Adamski, Johnny Red, Philip Kendall, M. Emrah Oral, Bill Loguidice, zxbruno (Yahoo era).
Key threads
- ZX Spectrum 48K Repair - Jan 2024 - Ryan got a ZX Spectrum 48K from the Bill Miller Collection (#5525 on groups.io) — Carl Miles's 65-message deep dive into diagnosing and recapping a dead Speccy, with side excursions into NTSC conversion crystals, vDrive ZX vs real Microdrive timing, and the +12V/-5V rail behavior of the Spectrum DC-DC converter.
- NTSC Spectrum (archive.org) — 50-message Yahoo-era thread that settles the question of whether a real NTSC Sinclair Spectrum existed (probably not) and documents Paulo Leite's TC2048/TC2068 jumper-and-crystal swap for 60 Hz, pointing at Jarek Adamski's 8bit.yarek.pl schematics.
- Switchable Timex Sinclair 2068 ROM modification (archive.org) — Richard Atkinson's twin-EPROM Spectrum-48K-in-HOME/EX-sockets mod using the channel 2/3 switch as ROM selector, plus Don Dindang's twister-board commercial version — the canonical way to run real Spectrum ROM on 2068 hardware.
- CZ2000 to TS2000 Prototype Conversion Project (#6840 on groups.io) — Confirms that Argentine CZ2000 hardware is literally a ZX-Spectrum Issue 6A PCB with a 6C001E-7 PAL ULA — the clearest link between South American Sinclair clones and the Speccy lineage.
- Spectrum Next 2.0 (#5764 on groups.io) — Owner unboxings and first impressions of the Kickstarter Next 2.0 (Greg Bennett, Jeff Burrell, Greg Skuza), covering SidNext AY/YM playback, CP/M, and CRT-vs-LCD viewing — the modern era's most useful Next intro.
- Spectrum Next Availability? (#8764 on groups.io) — Late-2025 thread mapping out how to buy a Next today (N-Go, XBerry Pi, 3D-printed enclosures, specnext.com forum) and pointing at Fusion Retro Books' Next Magazine.
- The Spectrum from Retro Games is now available...just not in North America (#7340 on groups.io) — Reviews and warnings on Retro Games' 'The Spectrum' re-creation — membrane incompatibility with original Speccy rubber mats and the missed 9-pin joystick opportunity.
- Investigating the Spectrum's RS232 Interface (ZX Interface 1), for a potential 2068 serial interface spectrum mode compatibility (#6293 on groups.io) — Jon's design-study writeup on the ZX Interface 1 serial port aimed at a switchable Spectrum-mode UART for the TSPico — also surfaces the MCLZ8 Teensy 4.1 Z80 replacement.
- Timex Sinclair 2068 Questions / ZX Spectrum 128K vs TS2068 (archive.org) — Definitive Yahoo-era comparison: the Spectrum emulator cartridge is the only path for Speccy 48K software on a 2068, and the TS2068's extra video modes still beat the 128K on hardware.
- What Game Should I Try First With Spectrum Cartridge? (archive.org) — Documents the OUT 244,3 incantation to put a 2068 into Spectrum mode via Jarek Adamski's emulator cartridge, plus the standard first-game list (Manic Miner, Frogger, Back2Skool).
- Gaming the Iron Curtain Book and Eastern Bloc Spectrum Clones (#8888 on groups.io) — Adam Trionfo's deep dive into Pentagon 128K and Eastern-Bloc Spectrum clones, with Josef Jelinek (Czech, owns Slovak Speccy clones) and Brett Hallen's Clueless Engineer YouTube channel as live primary sources.
All threads (152)
↳ marks a thread where this topic begins mid-conversation — the link jumps to the message where it starts.