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DOWNLOAD CHARACTER COMMANDS
Copy standard characters from ROM into RAM
IModel ASCII
1 Decimal Hexadecimal 1
Std. < ESC > “:” <O> <O> CO> 27 58 0 0 0 1B3A 00 0000
IBM < FS > -:” <O> <O> <O> 28 58 0 0 0 1C 3A 00 00 00
Copies all the standard characters to the corresponding download char-
acter RAM area, overwriting any download data already present. Ignored
when DIP switch 2-1 is ON.
Define draft download characters
Mode 1 ASCII
Decimal Hexadecimal
<ESC> “&”
co> nl 27 38 0 nl 1B 26 00 nl
n.2 m0 ml m2 n2 m0 ml m2 n2 m0 ml m2
m3... ml1
m3...mll m3...mll
Defines one or more new draft characters and stores them in RAM for
later use. DIP switch 2-l must be OFF; otherwise RAM is used as an
input buffer, not for downloading characters, and this command is ig-
nored. Draft mode must be selected before this command is executed.
nl is the character code of the first character defined and n2 is the character
code of the last character defined. nl and n2 must both be between 32
and 127 or both be between 160 and 255. nl must be equal to or less than
n2. Use of character codes 32 (space) and 127 (delete code) should be
avoided if possible.
Each character is defined by an attribute byte (m0) and 11 data bytes
(ml, m2 ,..... mll).
The most signitican bit of the attribute byte is 1 if the character is an
ascender (positioned entirely above the baseline) or 0 if it is a descender
(descending below the baseline). The attribute byte also indicates the
amount of white space to the left of the character (0 to 7 dots, specified
by bits 4 to 6) and the width of the character cell, including this space
(4 to 15 dots, specified by bits 0 to 3). The left space and cell width at-
tributes are used only in proportional spacing.
-
Each data byte indicates eight vertical dots, with the MSB being the top
dot and the LSB the bottom dot. These correspond to pins 1 to 8 or 2
to 9 of the print head, depending on whether the character is an ascender
or descender.
For further details, please refer to the Appendix C.
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