Справочник Пользователя для Epson LX-80

To find out whether your system is an 8-bit system, capable of

generating all 256 ASCII codes, enter this simple test:

 

 

 

 

 

 

 

 

 

 

If you get italic characters when you RUN this, you are using an 8-bit

system.

If you have a 7-bit system, you need to understand what happens

to the control codes you send. The LX-80 automatically interprets
these codes the way your system sends them-as the lower half of the

range. There is something you can do when you want to send the
upper half (128-255): have your program convert all codes outside of
the active range to their equivalent in the upper half by adding 128 to
them.

The problems that are associated with 7-bit systems include:

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Limitations on width in graphics mode

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Inability to use the top pin for graphics mode

User-defined characters can’t be printed with the top eight pins (the
standard position for most characters). Eight pins can’t be used in
defining characters.

Remember that the best solution usually is to use an interface that

can send eight bits to the printer.

The next four subsections illustrate dealing with interface puzzles

on four types of computers.

Applesoft BASIC does not use PRINT to send data to the screen

and LPRINT to send data to the printer as MBASIC does. Therefore,

put an PR#1 at the beginning of a program and change all instances
of LPRINT to PRINT.

If one of our programs contains an INPUT statement or a PRINT

statement, there will be a message that should go to the screen before
anything is sent to the printer. In these programs, leave the first lines
as they are and after the INPUT and/or PRINT statements, add a line
that states PR#1; then change all the instances of LPRINT to PRINT
and put a line that states PR#0 at the end of the program.

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