Hello! According to the images, that keyboard has the same chips as the first https://ardent-tool.com/keyboard/Model_M.html#PS2_PCBs http://ohlandl.ipv7.net/keyboard/Keyboard.html#Model_M_PCB Not sure which of the 2 copies of that website is the original one. It has a 4x4 block with the keys 1 2 3 A 4 5 6 B 7 8 9 C * 0 ? ? The two ? keys actually are unmarked grey keys, others are white. Right of the 4x4 block, there is a double height HELP key on top and a double height STOP key below it. "Despite using a PS/2 cable, the Screen Reader Keypad is not a typical PS/2 device. It was intended to be connected through either a PS/2 mouse port or a PS/2 port on a drop-in ISA expansion card for PC/XT and PC/AT systems called the IBM Screen Reader Adapter (P/N 57F1588, assembly P/N 57F1587, FRU 33F4842)." The page also links to https://sharktastica.co.uk/wiki?id=modelmsrk which gives more details. There, the keys below 9 and C are listed as # and D respectively, which is plausible. Regards, Eric
Hello. Here I found information about the special keypad. https://deskthority.net/wiki/IBM_Screen_Reader_Keypad It still insist that it worked on DOS, but as I told you, I had never seen it running. Regards.
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