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SPACE - Library 1 - Volume 1.iso
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megaboot.txt
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1987-09-03
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Documentation for MegaBoot v1.0
by Darek Mihocka and Ignac A. Kolenko Jr.
MegaBoot is yet another program to stick in your AUTO directory.
It has 3 functions:
- do a quick memory test
- switch to medium rez (if in color)
- and load the DESKTOP.INF appropriate for the current resolution
(a MUST for anyone with 2 monitors and a hard drive!!!)
0. System Requirments
MegaBoot must be placed in the AUTO directory of your boot disk. This
can be either A: or C: if your hard drive boots automatically.
MEGABOOT.PRG should be the first file in your AUTO directory. This
allows the memory test to test all of memory, before any RAMdisks take
part away. This also allows other AUTO programs to function in 80
columns, which is usually better than looking at a wide 40 column
display (especially if you just switched from mono!).
If you encounter any problems with this program, or have suggestions for
other features that could be put in, contact Darek Mihocka on Compuserve
at 73657,2714 and on GEnie as DAREKM.
Also if you have any questions regarding the aSTronomer, MegaBlit, or the
ST Xformer, feel easy about dropping a message. Our software is free.
the aSTronomer is Ignac's star chart program from the latest START.
MegaBlit is GEM based drawing program, soon to become avaiable as a Degas
Elite compatible accessory, with a built in shell.
The ST Xformer is an Atari 800 emulator that will soon appear in ST Log
magazine.
*************************************************************************
1. Memory Test
The memory test consists of a 2 pass destructive test of the heap. On a
1 Meg machine is takes about 3 seconds to completely finish. At boot up
time, less than 100K of memory is actually used, so most of the
available memory is tested. The 32K of screen memory will show it's
defects (if any) very clearly, and any defects in lower RAM will
probably result in the computer not booting. So the memory that is
tested is what will be used by accessories and applications.
The first pass writes hex values $FF to all the memory locations, then
goes back and checks them all. The second pass then does the same thing
with value $00. If any bytes change in value, the memory test is
reported to have failed, otherwise it passes.
If the memory test does fail, use a more complex memory testing program
to isolate the exact memory location that fails.
2. Medium Resolution
The ST normally boots up in lo resolution if it is in color. This
results in a 40 column desktop. By switching to medium rez, you can save
the DESKTOP.INF file to allow it to boot up in 80 columns next time.
However, any programs in the AUTO directory will still be executed in 40
column mode, since DESKTOP.INF is loaded after the files in AUTO
execute.
MegaBoot solves this problem by switching to medium resolution right
away. It must be the first file in the AUTO directory.
3. DESKTOP.INF
A major problem with having 2 monitors is that a desktop saved in
monochrome will boot up in 40 column mode on a color monitor. This
usually results in half the icons and windows being off the screen,
especially if you have a hard drive with 10 or more icons!
Conversly, a desktop saved in color will boot up in monochrome with most
of the icons bunched up in the top half of the screen.
To solve this, you must save DESKTOP.INF twice. In monochrome, save it
and then rename it to DESKTOP.HI. In color, save it and rename it to
DESKTOP.MED. MegaBoot will then copy the appropriate file to DESKTOP.INF
so that the desktop comes out properly.
DESKTOP.HI and DESKTOP.MED can be changed to hidden files so that only
DESKTOP.INF appears on the desktop. Remember to update them if you wish
to modify DEKSTOP.INF, since DESKTOP.INF gets erased on every boot.
*************************************************************************