The 88-2SIOJP is a post era S-100 card released in 2016. It is designed and sold by Martin Eberhard.
"The 88-2SIOJP is an enhanced dual serial port board designed for the MITS Altair computer..." - Martin Eberhard
Martin can be found in the Yahoo Groups Altair Computer Club - A place for Altair enthusiasts and collectors.
Local copy 88-2SIOJP Manual
Local copy Amon Users Manual
Martin's Google Drive manuals
Martin's excelent Xmodem implementation on Google Drive
88-2SIOJP-R100 Rev C
Aside from the reconfigured baud rate this is the 88-2SIOJP-R100 as delivered.
Image n/a yet.
20ma current loop Teletype model 33 ASR
I reconfigured the board from RS-232 to 20 ma current loop to interface with my restored Teletype model 33 ASR here pictured with Martin's 88-2SIOJP Amon 2.1 monitor signon message.