KIM-1 7-segment font?

Paul R. Santa-Maria paulrsm at buckeye-express.com
Sun Oct 1 19:09:10 CDT 2006


Ethan Dicks wrote:
> I'm prototyping an LED display thingie and was trying to find a
> representation of how folks used to do letters on a 7-segment display.
> The two historical examples I came up with were the KIM-1 and a Byte
> magazine article between about 1977 and 1981.

> what I need is the definitive source for the patterns.

For the KIM-1, the only definitive source is the ROM,
and that only has patterns for hexadecimal:

* HEX-TO-LED SEGMENT CONVERSION TABLE
*   SAME AS $1FE7 IN THE KIM ROM.

 DB $BF,$86,$DB,$CF ;0 1 2 3
 DB $E6,$ED,$FD,$87 ;4 5 6 7
 DB $FF,$EF,$F7,$FC ;8 9 A b
 DB $B9,$DE,$F9,$F1 ;C d E F

As Mr. Veit has written, the First Book of KIM has
more letters.  Another source is issue 1 of the
KIM-6502 User Notes, which has a slightly different
alphabet:

 DB $BD,$F6,$86,$9E ;G H I J
 DB $B8,$BF,$F3,$ED ;L O P S
 DB $BE,$EE,$FC,$D8 ;U Y b c
 DB $DE,$F1,$EF,$F4 ;d f g h
 DB $84,$9E,$86,$D4 ;i j l n
 DB $DC,$F3,$D0,$F8 ;o p r t
 DB $9C,$EE,$C0     ;u y minus
 DB $F0,$B7,$D4,$E7 ;k m n q
 DB $BE,$EA,$9C,$94 ;q v w x
 DB $C9,$D3,$80     ;z ? space

You can find the KIM-6502 User Notes at
www.6502.org in the publications section.

--
Paul R. Santa-Maria
Temperance, Michigan USA


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