#comm/vt100/printscreen
04-Jul-88 17:41:20
Sb: #133173-#comm/vt100/printscreen
Fm: Don Curtis/SYSOP 76703,4321
To: RON TROY 76064,252
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Ron,
You sure do have the full graphics ability….are you using the
original disk (copy there of that is) or have you moved the files onto another
disk? If so, did you move all the fonts also?
There is a MAJOR difference in the way the IBM handles text and the way
the Amiga handles text. That major difference is why it's very easy to do a
text dump on an IBM and not on the Amiga. You can do graphic dumps on an IBM
(vs text dumps) and they take as long as a graphic dump on an Amiga.
Normal IBM graphics are character graphics, not bit mapped graphics.
They have graphic characters for corners, t's, x's, horizontal and vertical
lines and the like. When the IBM prints a character to the screen, what it
really does is place the character itself in memory in an array. The IBM
screen handler looks at this array every vertical interupt and creates the
screen by grabbing a bit pattern out of ROM and placing it into the video
memory area. If you did a dump of the array, it would look exactly like normal
text…because it is a normal character array.
If you did a dump of the screen memory…it would look like garbage
because it is the bit patterns. A Print-Screen on the IBM only prints the
array…not the bit patterns. This has advantages of being able to do this,
but disadvantages of not being able to use multiple fonts.
Also, the IBM isn't a windowed environment…that makes a major
difference also.
Don