These are the only details I could find based on that page and readme:
Quote:
Expansion RAM ($5C00-$5FFF, read/write) CPU $6000-$7FFF: 8 KB switchable PRG RAM bank Bankswitching included. Readme file for more info. Extended RAM mode ($5104)
Quote:
Top Gun Mapper Conversion
From UNROM to MMC5 (from UNROM to Mapper 5)
by Dracula X
RELEASE DATE: August 15, 2019
TIME SPAN FROM START TO FINISH: 1 Day
Bankswitch:
To use it, all you have to do is select a bank and jump to it.
LDA bank_number
JSR $FFB0
You can also use Nflate from
http://www.romhacking.net/ Utilities to expand the ROM up to 512kb.
You can now use free RAM space at $5c00 to 5fff and $6000 to $7fff for cool or new stuff.
Bankswitching:
to bankswitch from $8000 - $Bfff and from $C000 - $ffff, here's how to do it:
LDA bank_number
JSR $FFB0
JMP New Location
or
LDA bank_number
JSR $FFB0
RTS
New location would be $8000 or $A000 etc... Bank 08 would be at $20010.
Credits:
Rockman: for info on how to convert the mapper!
Disch: for his mapper docs!
Have fun!
This patch only works for:
US Revision 0
US Revision 1
This patch does not work for:
Japan Version
Europe Version
Non Supported Emulators:
Nintendulator
RockNES
VirtuaNES
Opinion (though you didn't ask for it directly): this is someone trying to make a name for themselves and get attention. This has happened for decades in the romhacking community, and in old days, the more senior/experienced folks would usually "weed out" these people in chat channels because they brought nothing to the table. On the flip side, this at least means the guy can do some assembly work, which means he/she'll be sought after in the romhacking community (graphics hackers are in abundance, script hackers are somewhat in abundance, but the people who do the underlying RE and assembly work and know what they're doing are still rare. That fact is actually what made the SD3 romhack/translation so memorable/remarkable -- Neill Corlett does very, very good work.)
While switching games to a different mapper *is* an involved process and I respect that work (honest!), in this case -- based solely on the above info -- there seems to be no actual goal other than "look mum, I did something".
That said: if this is a stepping stone for the romhacker to begin doing more extensive romhacks of Top Gun (and maybe use MMC5 features?), then THAT is something worthwhile -- and I do hope that is the goal. (I always liked Top Gun more than Top Gun 2.)