AT Keyboard Interface

2009-06-15 02:36 by Ian

My first HC11 project when I was 16. This device plugs into an AT keyboard and converts the scancodes to ASCII, sending them over an RS-232 port at 9600bps.

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HC11 32-bit by 32-bit multiplication routine

2009-05-16 00:43 by Ian

A couple quick subroutines that give an HC11 the means to get a 64-bit product from two 32-bit factors. I wrote it down on paper while I was sitting in my calculus class and copied it into my assembler verbatim when I got home.

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DTMF Logger

2009-05-16 00:35 by Ian

The DTMF logger uses an MT8870 DTMF decoder chip to listen to a POTS line and store any digits it hears in a 24C256 I2C EEPROM.

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