30 Sep
2006
30 Sep
'06
2:24 p.m.
Ethan Dicks schrieb:
On 9/29/06, Don <THX1138 at dakotacom.net>
wrote:
Look into the first book of Kim-1 (available from the net):
excerpt:
THE KIM-1 ALPHABET.
Some letters, like M and W, just won't go onto a 7-segment
display. Some, like B, are only possible in capitals; others,
like T, can only be done in lower case. So here's an
alphabet of possibles:
A - $F7
B - $FF b - $FC
C - $B9 c - $DB
D - $BF d - $DE
F - $F9
F - $F1 f - $F1
G - $BD g - $EF
H - $F6 h - $F4 1 - $86
I - $86 i - $84 2 - $DB
J - $9E j - $9E 3 - $CF
L - $B8 l - $86 4 - $E6
n - $D4 5 - $ED
O - $BF o - $DC 6 - $FD
P - $F3 p - $F3 7 - $87
r - $D0 B - $FF
S - $ED 9 - $EF
t - $F8 0 - $BF
U - $BE u - $9C minus - $C0
Y - $EE y - $EE
Guess it is obvious how to read this:
bit 7 = dot
bit 6 = segment g
bit 5 = segment f
...
bit 0 = segment a
Regards
Holger
Ethan Dicks wrote:
Individually driven from a 6520 port.
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...
How were the displays driven? I.e., were the segments individually
driven (each segment under software control) or were they driven
by a "7 segment LED driver"? In the former case, you'd need a definitive
source for the
patterns used. (given that, I can build you a TTF or PS font)
I don't need a TTF or PS font (I'm doing a bit-mapped emulation and I
already have the code done to render all possible patterns on some
simulated 7-segment displays), what I need is the definitive source
for the patterns.
-ethan