Re: A2386SX

From: Ethan Dicks <>
Date: Tue, 18 Jul 2017 17:22:44 -0400
Message-ID: <>
On Tue, Jul 18, 2017 at 4:50 PM,  <> 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
> where I can find that it's a 2KiB ROM (?) called 8242/8742
> 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.


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Received on 2017-07-18 22:00:02

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