On Tue, Jul 18, 2017 at 4:50 PM, <silverdr@wfmh.org.pl> wrote: > > I tried to find what are the EPROM chips... and the other one I am not even sure if it is an EPROM it's marked with 391171-01. Googling gives me Martin's pages for example > > http://mhv.bplaced.net/cbmroms/cbmroms.php > > where I can find that it's a 2KiB ROM (?) called 8242/8742 > > http://mhv.bplaced.net/cbmroms/8242.htm > > Interesting capacity for a 40 pin chip... could someone shed some light on what it actually is? It's a so-called "keyboard BIOS" chip - really a microcontroller to speak AT-keyboard protocol to a PC-AT|PS/2 keyboard with a parallel interface for the PC side. Once standalone, long since folded into PC motherboard "chipsets", and as Konrad B mentioned it's an MCS/48 family MCU. An ancestor is the Intel 8048. https://en.wikipedia.org/wiki/Intel_MCS-48 -ethan Message was sent through the cbm-hackers mailing listReceived on 2017-07-18 22:00:02
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