Epson SQ-2000, Operating Manual

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TRS-80 Computers
The TRS-80 computers are not without their own set of quirks.
The TRS-80 Model I computer, for instance, does not correctly
send ASCII decimal codes 0, 10, 11, and 12 to printers like the
SQ-2000. A quick solution for TRS-80 Model I (and TRS-80 Model
III) users to avoid sending ASCII decimal 12 (Form Feed, or
<FF>) is to use its high-order counterpart ASCII decimal 140.
This is achieved by adding 128 to the problem code (128 + 12 =
140).
There are two more generic solutions for avoiding these prob-
lem codes. First, these codes can be sent directly to the printer
with POKE codes. The following routine will accomplish this:
100 IF PEEK(14312)<>63 THEN 100
110 POKE 14312,N
Line 100 checks the printer’s status by putting the program
into a continuous loop until it finds decimal 63 in memory loca-
tion 14312.
With the TRS-80 Model I and TRS-80 Model III computers, you
can also modify the printer driver so that the problem codes are
sent correctly to the printer. The following printer driver was
written by Bob Boothe and reprinted with the permission of 80
Microcomputing
(Wayne Green Publishers). Try the following
routine for Model I users (Model III users, see the small change
below).
10 DATA 21E837CB7E20FC211100397E32E837C9
20 READ B$: A=16571
30 FOR P-1 TO LEN(B$) STEP 2
40 B=ASC(MID$(B$,P,1)) - 48
50 IF B>9 THEN B=B - 7
60 T=ASC(MID$(B$,P + 1,1)) - 48
70 IF T>9 THEN T=T - 7
80 POKE A,B*1G + T
90 A=A+1
100 NEXT P
110 POKE 16422,187
120 POKE 16423,64
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