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This is a closeup of the MMC2IEC device. It is plugged into the SERIAL port, and there is a connector to the cassette port for +5V.
First computer
After viewing the ITCrowd website and seeing their Sinclair ZX81 I had to let out a snigger. My machines better than theirs.
Here's a back shot. Note the 10V DC power supply.
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To convert the teletype's tape reader to not require pulses on the control line in Line mode, move the brown wire on Molex 4 (upper right in this view) from pin 7 to pin 11.
The TT-RAM of an Atari TT. An Atari TT has two kinds of RAM, slower ST-RAM that sits on a 16MHz bus, and faster TT-ram that sits on a 32MHz bus, the same as the CPU. My TT is upgraded to a whopping 16MB of TT-RAM.
Upgrading the RAM was bit of an adventure. I found a description on a forum on how the jumpers should be set. One of the jumpers set the memory type, apparently there are two kinds of SIMM, burst and non-burst IIRC. Burst SIMM were apparently very rare, on the edge of non-existing according to those sources so I expected that jumper to be correctly set to non-burst. But after replacing the SIMMs it wouldn't detect any TT-RAM at all at first! Turns out that the old RAM was of the rarer kind, so after changing the jumper it worked as it should.