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.
See also:
My TEC-1D
I bought a PCB from Ben Grimmett, active on ebay and on the facebook group "Australian Vintage Computer Group"
Parts or...
TEC-1 system ROMS
Archive with all ROM images, sources, instructions, articles
## Mon-1
by John Hardy
The orginal ROM that shippe...
TEC-1D
The TEC-1C and TEC-1D were designed after the last issue of Talking Electronics was published. So no articles to show he...
TEC-1 addons
Addons published, most of those to be inserted in the expansion connector, so one at a time.
The crystal oscillator gic...