Apple-2-SW/bitmap-editor
1
0
Fork 0
mirror of https://github.com/tilleul/apple2.git synced 2024-11-29 15:50:11 +00:00
Code Issues Projects Releases Wiki Activity

Delete spc_ex.md

Browse Source
This commit is contained in:
tilleul 2021-05-19 11:57:37 +02:00 committed by GitHub
parent 51e9a9edea
commit 7ca567d6fd
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 0 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
applesoft/spc_ex.md
View File

@ -1,20 +0,0 @@
# Use SPC() to print any character !
## Introduction
You know how `SPC()` can be used to PRINT a number of space characters. For example `PRINT SPC(10)` will print 10 space characters.
Why didn't they allow to print something else than space characters ? It would have been interesting (?) to have the ability to repeat a sequence of any character.
Maybe like `PRINT REPT("*",10)` would print 10 asterisks.
But Applesoft does not provide such an instruction. So are we doomed to use `PRINT "**********"`?
Here's a technique that will allow you to repeat any character, even in `FLASH` and `INVERSE` without using additional 6502 routines.
## Discovery
Let's see something weird ...
At the Applesoft prompt, type `FLASH`.
Then `PRINT SPC(10)`. You should now see 10 flashing space characters.
Now, press `CTRL-BREAK`. This exits the "flash" mode (do no type `NORMAL` !!).
Type `PRINT SPC(10)` again. And ...
WOW ! WHAT IS THAT ??