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My TEC-1D

I bought a PCB from Ben Grimmett, active on ebay and on the facebook group “Australian Vintage Computer Group”
Parts ordered from China Ali Express and Reichelt Germany. Found very nice 6 mm tactile switches with transparant replaceble caps, so the command letter of the key command can be printed, cutout and inserted.
Also ordered the Writable ROM module Ben designed to replace the 2732 with. Easy to program, test, change system ROMS all from the PC!
This page will document the build.

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TEC-1 system ROMS

Archive with all ROM images, sources, instructions, articles

## Mon-1
by John Hardy
The orginal ROM that shipped with the TEC-1 in 1983
Included:
– original BIN binary of ROM
listing in HEX format
listing in disassembled LST format
Reconstructed, labelled and annotated listing in Z80 ASM format
Licensed under the GPL public license v3.0

## Mon-1A
by John Hardy with portions written by Ken Stone
This ROM added a sequencer routine at 0x05b0
Included:
– original BIN binary of ROM
– listing in HEX format
– listing in disassembled LST format
– reconstructed, labelled and annotated listing in Z80 ASM format
Licensed under the GPL public license v3.0

## Mon-1B
by John Hardy with portions written by Ken Stone
A maintenance release which cleans up some junk at 0x07E2 that was added with Mon-1A
Included:
– original BIN binary of ROM
– listing in HEX format
– listing in disassembled LST format
– reconstructed, labelled and annotated listing in Z80 ASM format
Licensed under the GPL public license v3.0

## Mon-2
by Ken Stone
A rewrite of the monitor ROM
Included:
– original BIN binary of ROM
– listing in HEX format
– listing in disassembled LST format
– reconstructed, labelled and annotated listing in Z80 ASM format
Licensed under the GPL public license v3.0

## JMON Monitor
by Jim Robertson
Included:
– original BIN binary of ROM
– listing in HEX format
– listing in disassembled LST format
– Listing in Z80 ASM format
– Fully commented source listing by Jim Roberton (PDF)
Licensed under the MIT license

## Utilities / Disassembler ROM
by Jim Robertson and Mike Donaghy
Included:
– original BIN binary of ROM
– Listing in Z80 ASM format (needs more work)
– Fully commented source listing by Jim Roberton (PDF)
Licensed under the MIT license

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TEC-1D

The TEC-1C and TEC-1D were designed after the last issue of Talking Electronics was published. So no articles to show here, only a component list.

The design is identical to the TEC-1B. Only the PCB had some improvements, simple cheap tactical switches are used for example, function names are printed as part of the silkscreen on the PCB.

While the original TEC-1D is still available as a kit from Talking Electronics, a recent production run of the PCB as Reproduction 2018 is available from Ben Grimmett via ebay e.g. The latest is double sided, so no more wires!

Reproduction TEC-1D by Ben Grimmett, note the nice keycaps available on Ali Express.

 

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TEC-1B

The TEC-1B is an incremental upgrade to the TEC-1A.
The SHIFT key is now standard. The 8212 latches are replaced with 74LS273 IC’s, easier to buy.
The EPROM socket now accepts a 2732, double the TEC-1B 2716. With a switch either the lower or upper part ar switched into Z80 memory space. This allows the old MON1B and newer MON2 ROM to be used, so compatibility with older programs is achieved.

Publsihed in Talking Electronics issues 13 and 14. PDF of the articles here.