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Apple IIgs' Mega II Emulation
- Subject: Apple IIgs' Mega II Emulation
- From: Immortal Nephi <Immortal_Nephi@hotmail.com>
- Date: Thu, 6 Aug 2009 14:51:19 -0700 (PDT)
- Complaints-to: groups-abuse@google.com
- Injection-info: f10g2000vbf.googlegroups.com; posting-host=208.252.179.27; posting-account=8hHxKgkAAADaP7KI2C2vG3ukpGjeKnVU
- Newsgroups: comp.sys.apple2
- Organization: http://groups.google.com
- User-agent: G2/1.0
- Xref: g2news2.google.com comp.sys.apple2:12499
I have been researching to do reverse engineering with Mega II chip
for many years. I focus Double HiRes on my video project. I am able
to reproduce NTSC to RGB emulation into 100% success.
The programmers who wrote AppleWin, KEGS, XGS, and other emulators
tried to reproduce incorrect DHGR table. The incorrect DHGR table has
color information.
They thought that Mega II chip might have ROM inside which it
contains color information table. Not quite. I assure you that ROM
in the Mega II chip contains boolean table and logic gates with no
color information.
I am more than happy to give you screenshots for both HiRes and
Double HiRes. I do not have my own home page. My source code uses
boolean table to generate color information. It is not available for
public yet.
Everyone is happy to use either “Apple II NTSC emulation” or “Apple
Iigs’ Mega II emulation”.