4.
Activate the 80 column mode and tune the 80 column video
display.
Activate the 80 column mode by entering
PR#3
and pressing
Return. Type
RUN
to execute the video display program. The
screen should fill with characters.
lf necessary, readjust the display controls as you did for the 40
column mode in step 2.
5.
Switch back to 40 column mode and recheck video alignment.
Enter Control-Z and then 1 (Press the Z key while holding down
the CTRL key then press 1). This is the command to deactivate
the 80 column mode and return to 40 column display (The @
symbols on the screen are normal).
RUN
the program again. You
may need to repeat steps 4 and 5 until the video display is
acceptable in both 40 and 80 column modes.
Something not right? See the Video Troubleshooting Guide in
Appendix A.
Software Compatibility
In General...
The Viewmaster 80 will support virtually all 80 column application
software written for the Apple ][ or ][ Plus. Most software written
specifically for 80 column display will usually activate the 80 column
mode automatically or give you a menu option to select either 40 or
80 column display. Some earlier programs, however, were written
before there was an established standard for interfacing with 80
column display cards. These programs may require a "preboot"
program to activate the Viewmaster 80 and make the necessary
modifications to enable the software to use the 80 column display.
Older versions of AppleWriter ][ and VisiCalc are examples of
programs which may require a preboot disk to work properly with
the Viewmaster 80 (or any 80 column card). Usually the publisher of
the software will provide the preboot program or an updated
program which will support the Viewmaster 80. Many useful
programs for making earlier 40 column software compatible with 80
column cards are available in the public domain. Please check with
the software publisher, your dealer, or local Apple user's group about
preboot utilities or updates.
4
ViewMaster 80