May June 1980 - Commodore Computers

54 SA COMPUTE. MAY/JUNE. MAYIJUNE.1980 198O ISSUE 4. .4
The ASCII Output
Table 1 shows the ASCII data that is output for
The ASCII Output
Table 1 shows the ASCII data that is output for
each of the special characters. Notice alice the Spinwriter
requires a three code sequence ence for two of the characters
on the print thimble. Also given in in the table are the
characters printed for two of the thimbles. One is is
the Courier 10, which has a standard ASCII character
set. The other is the Courier Legal lOB, which
has some legal symbols substituted for some of the
standard ASCII characters.
the Courier 10, which has a standard ASCII charac
ter set. The other is the Courier Legal 10B, which
has some legal symbols substituted for some of the
standard ASCII characters.
Modifying The Patches
Though T the machine code patches are different, , the
enhancements for WordPro II and III operate almost
identically. y. To cover modification of both enhancements,
I will reference WordPro III modifications
directly and put the corresponding reference for
WordPro II in brackets.
WordPro II in brackets.
First let's 's look at what needs to be changed to
use the enhancement with a graphics keyboard. At
one point in the patch code the last keystroke in
the keyboard input buffer is checked to see if it
is SIB $IB [S7F for WP2), which is the code for the
ESC [REPEAT] [REPEAT) key. To T o change the key just change
the byte used in the comparison. This byte is the
first byte in the line e that begins at address
$0610 [third byte of the line that begins at address
S028A) $028A]. . Changing this byte to $DE SOE will allow you to
use a shifted uparrow instead.
use a shifted uparrow instead.
Next, let's look at changingg the ASCII data output
for the special characters. This will allow you to use
a different printer and possibl y change the fun ct ion
a different printer and possibly change the function
of the enhancement. The patch code that handles the
output checks each character to be printed if it is in
the range $71 to $79. Only the special characters
used by the enhancement wi ll be in this ra nge. If a
used by the enhancement will be in this range. If a
special character is found, the most significant four
bits are discarded, and the least significant four bits
used as an index to a table. The table begins with
used as an index to a table. The table begins with
the sixth byte of thee line with address $4420 [first byte
of the line with address S3FOD). The first byte
of the line with address $3FDD]. The first byte
would be output for a special character with the value
$70. Currently thiss value isn't used so the byte is
SOO . The next byte would be output for a character
$00. The next byte would be output for a character
with the value $71, and so forth up to S79. $79. The
data in this table may be changed to whatever you
data in this table may be changed to whatever you
require.
It may be necessary to also change which special
characters output the three code sequence. Once a
special character has been n detected and its index
obtained, that index is co compared with the th third byte
of the line with address i43F8 $43F8 [second byte of the
line with address S3FBO) $3FBD]. . If the index is equal to
or greater than this s byte, the three code sequence
is used. Changing this byte to SOA $0A would cause all
the special characters to output only the data byte
in in the table. To cha change the first and third characters
used in in the sequence, set the first byte of the liline
with address $4410 0 [seventh byte of line with address
S3FC5] S3FC5J to to the First first character of your sequence, and a nd
the fourth byte of the line with address $4418
[second character of line with address $3FD5] S3FD5)to the
e
third character of your sequence.
One other modification is to add a special character
for the e 0 key. To do this, change the sixth
byte of the line with address $0618 [last byte of
the line e with address $0292] S0292) to $30, and the first
byte of the line with address $43e8 [seventh byte of
the line e with address $3fad] S3fadJ to $70. S70. Then put the
byte you want to be output in the first byte of the
table.
The above extension was prompted by feedback
from readers wanting to adapt the WordPro II
enhancement ancemcnl for use with a different printer.
Hopefully y the discussion will be sufficient for most
situations. . If you do make mods for another printer,
please send them to COMPUTE, COMPUTE. so we can pass
along to other readers.
TABLE 1
ASCIIA ·C ll
ThimbleT CharacterC Printed
Characters
Courier
Special (Hex)( Legal
Character Output Courier 10 10B lOB
1I 5E oc
2 5C
0®
\
3 60 O0
4 7C
1 11
5 7D '1
{ §
6 713 7B
} t
7 7E '"
8 OE 0E,58,0F ,58,OF
9 OE 0E,5A,0F
A,OF
•
£ T
Reproduce and Attach Above Numeric Pad
7= - 8=. 9=£
4=1 5={ 6= }
1=' 2= \ 3='
7= '" 8= 9=[
4= '1 5=§ 6=t
1= c 2= 3=0
©