Hey,The 4116 adaptor is covered here (near the bottom) http://www.ukvac.com/forum/abi-b4k-test-basic_topic339944.html I've tried to gather as much info / files as I could since picking up my boardmaster but I've never come across any adaptor info for the 75188. There doesn't seem to be that many people that own / use the bm4k these days though which doesn't really help. Judging by the serial numbers I've seen I don't think abi sold more than 200-300 units and how many of them have survived... so that probably explains it. I recently got a message from a german repairer / abi4k owner that passed up the long lost masterlink software at some computer fair / flea market as he didn't know what it was at the time and so far hasn't been able to track down the seller. :/ How are things going with the keyboard adaptor? do you think it'll ever get released? Cheers Paul. On Sunday, 7 August 2016, 17:28, Andrew Finn via Techtoolslist <techtoolslist@flippers.com> wrote: Hi Does anyone have any info / circuits on the 75188 adaptor ( also known as the mc1488 rs232 transceiver) so these can be tested in the ABI boardmaster 4000? There is also a 4116 ram adaptor too so the boardmaster tells me!! Google on this occasion is not my friend as it comes up with nothing out of the whole of the Internet!!! Many thanks Andrew Sent from my iPhone Please excuse any spelling or grammar mistakes as this was sent from my iPhone _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/ _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/