THIS PACKAGE COMES WITH ABSOLUTELY NO WARRANTY OF ANY KIND, EITHER EXPRESS OR
IMPLIED, STATUTORY OR OTHERWISE. THE ENTIRE RISK AS TO USE, RESULTS AND
PERFORMANCE OF THE PACKAGE IS ASSUMED BY YOU AND IF THE PACKAGE SHOULD PROVE
TO BE DEFECTIVE, YOU ASSUME THE ENTIRE COST OF ALL NECESSARY SERVICING,
REPAIR OR OTHER REMEDIATION.
UNDER NO CIRCUMSTANCES, CAN THE AUTHOR BE HELD RESPONSIBLE FOR ANY DAMAGE
CAUSED IN ANY USUAL, SPECIAL, OR ACCIDENTAL WAY, ALSO IF THE OWNER OR A THIRD
PARTY HAS BEEN POINTED AT SUCH POSSIBILITIES OF DAMAGE.
This install applies to "Megademo 2" © 1988 Alcatraz.
This install requires WHDLoad to be in the path.
It can be found in the WHDLoad package.
To install from a different drive than DF0: select installation mode Expert.
The installed demo requires 0.5 MB ChipMem (+0.5 MB for preload).
It can be quit by pressing F10 (key can be changed with Tooltype "QuitKey=").
- Full load from HD
- OS stuff patched/recoded (AllocEntry)
- Self-modifying code fixed
- All decrunchers (ByteKiller) relocated to fast memory and error check added
- Bplcon0 color bit fixes (x4)
- DMA wait in replayer fixed (x6)
- Byte write to volume register in replayer fixed (x6)
- Write to $dff000 disabled
- Blitter waits added (x10)
- Line drawing routine fixed
- OCS only DDFSTRT fixed (part 4)
- Write to HTOTAL fixed (part 3, wrong loop counter in fade routine)
- Access fault fixed (add.b #1,ScrollTextPtr in part 4)
- Interrupts fixed
- DMA settings fixed
- Timing fixed
- CPU dependent delays fixed (x2)
- NewIcon (created by me)
- Source code included as usual
- Quit option that works on 68000 machines (default key is 'F10')
Here's the patch for the second Megademo by Alcatraz which was released
a few months after the first one. Nice music, graphics and code
again, it's another demo that is still enjoyable almost 25 years after
its initial release.
Patching took a little while as Zodiac used some OS-functions such as
AllocEntry in his parts which I had to emulate. There also were a few
CPU dependent delays and the replayers had the usual bugs. The tune
in the first part was played too fast because the counter in the replayer
was increased by 2 instead of 1. I have no idea why the tune was played
correctly on 68000 machines but anyway, it's now fixed.
I have relocated all ByteKiller decrunchers as usual and added an error
check so WHDLoad will quit with an appropriate error message if decrunching
fails. Zodiac's parts were crunched with the HQC cruncher which is bascially
ByteKiller for relocatable code i.e. the data won't be decrunched to a
fixed address, quite nice actually for that time! These parts will be
decrunched during installation.
The demo can be downloaded here:
Enjoy this great classic from HD and have a nice weekend everyone.
Greetings to all in Scarab and Scoopex, the WHDLoad team, PMC,
Musashi5150, Skan, Slummy, Loaderror, Frequent, Wayne Kerr, Mr.Spiv,
Alpha One, CFou!, Paradroid and all the other usual suspects. :)
Special greetings to all Golf MK1 fans worldwide except those
lowlifes who "borrowed" my MK1 for a joyride!
Extra greetings to the usual suspects on #amigascne, see you all at
Revision 2014! :)
version 1.03 (15.04.2020)
- fixed possible freezing on some machines (issue #4472)
version 1.02 (14.04.2020)
- writes to BPLCON3/4 in slave removed
- blitter waits added
- write to HTOTAL fixed
- access fault fixed
- line drawing routine fixed
- OCS only DDFSTRT fixed
version 1.01 (04.01.2014)
- fixed 2 more byte writes to volume register
- write to $dff000 disabled
version 1.00 (06.10.2013) done by StingRay:
- initial release
- source code included
If you have problems with this installation please try and get a newer
version of this package from the WHDLoad WWW-Page. If that doesn't help try
some Tooltypes like NOCACHE, NOAUTOVEC, EXPCHIP, NOMMU, PAL or NTSC. If
that also fails, please inform the author via the Bug-Report-Form which
can be accessed on the WHDLoad WWW-Page.
For the full WHDLoad package, other installs and updates refer to: