a little Model 1 surprised Special EI...

[Patrick.B (TTR)]

So, I acquired a Complete Model 1 (see picture) system and its lovely and runs perfectly.
But in the bottom of the large box was this other black metal box, with labeling that predicted what I assumed to be an Expansion Interface.
Out of curiosity I unscrewed the main board to see markings and discovered it was not a radio shack but a Micro Design Expansion Interface Model MDX2
I just wanted to share , but at first look it looks complete including RTC but not something called "modem on board but has the serial port on it.

 

[Patrick.B (TTR)]

I also uploaded the MDX-2 Manual on https://archive.org/details/trs-80-model-1-mdx-2-interface-expansion-board-v-1.5-1980-micro-design

 

[pski]

So, I acquired a Complete Model 1 (see picture) system and its lovely and runs perfectly.
But in the bottom of the large box was this other black metal box, with labeling that predicted what I assumed to be an Expansion Interface.
Out of curiosity I unscrewed the main board to see markings and discovered it was not a radio shack but a Micro Design Expansion Interface Model MDX2
I just wanted to share , but at first look it looks complete including RTC but not something called "modem on board but has the serial port on it.


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"Lord Vader, your expansion interface is ready."