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Appendix D
We can get around this limitation by POKEing the code numbers directly to the
printer buffer, foiling BASIC’s attempts to intercept it. The location we POKE
is 14312, so use:
POKE 14312,0
In fact, we could use POKE to send ALL our graphic codes, but this approach
creates timing problems between the printer and computer. Every POKE needs
to be followed by a test to see if the printer is ready to accept more codes.
Example:
10 POKE 14312,0
20 IF PEEK (14312)<>63 THEN 20
Line 20 places the program in a delay loop until the printer is ready.
Entering Graphics Mode
0 is also used to enter the graphics mode. For example:
10 LPRINT CHR$(27) “K” CHR$(50) CHR$(0);
ESC K Nl
N2
Since the MX-70 interprets all even numbers as 0, we can change the last part of
the above line to
CHRS(2);
The POKE alternate is
10 LPRINT CHR$(27) “K” CHR$(50); :POKE 14312,0
20 IF PEEK (14312) <>63 THEN 20
TRS-80 Model II
The MX-70 works fine with Radio Shack printer cable #26-4401. Be sure the
connectors on both ends make good contact. It may be necessary to open the
printer case a bit to allow the plug to seat properly.
TRS-80 Model III
No interface kit is necessary for the Model III. Simply plug the Epson cable into
the printer port.
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