Archived from groups: rec.games.video.arcade.collecting (
More info?)
The roms are encrypted yes, but the decryption circuitry is built into
the z80. It has to be to do it right, otherwise you could just hook a
fluke up to the z80 socket and read out the roms. So yes there is
something different about these z80's, although I guess technically
it's not a z80
This is common for Sega games, when I get time I
plan on reproducing the sega custom z80's. I ran off some PCB's
earlier just haven't programmed the CPLD. Here's a list I pulled out
of MAME of encrypted z80's and their part numbers. It also decrypts
epoxy blocks like jumpshot, pacman plus and shoot the bull that work
like an encrypted z80 so you don't have to open up the epoxy.
CPU Part # Game Comments
???-???? Buck Rogers unencrypted version available
315-5010 Pengo unencrypted version available
315-5013 Super Zaxxon used Zaxxon for known plaintext
attack
???-???? Super Locomotive
315-5018 Yamato
315-5028 Sindbad Mystery
315-5030 Up'n Down & unencrypted version available
M120 Razzmatazz
315-5033 Regulus unencrypted version available
315-5041 M140 Mister Viking
315-5048 SWAT used Bull Fight for k.p.a.
315-5051 Flicky &
Ninja Princess (bootleg)
315-5061 Future Spy
315-5064 Water Match used Mister Viking for k.p.a.
315-5065 Bull Fight
315-5069 Star Force game by Tehkan; same key as
Super Locomotive
???-???? Spatter
315-5093 Pitfall II
315-5098 Ninja Princess unencrypted version available;
same key as Up'n Down
315-5102 Sega Ninja unencrypted version available
315-5110 I'm Sorry used My Hero for k.p.a.
315-5114 ?? pcb 834-5492 same key as Regulus
315-5115 TeddyBoy Blues
315-5132 My Hero
315-5135 Heavy Metal &
Wonder Boy (set 1a & 3; bootlegs?)
???-???? Lovely Cards
315-5162 4D Warriors & used I'm Sorry for k.p.a.
Rafflesia
315-5177 Astro Flash &
Wonder Boy (set 1)
315-5178 Wonder Boy (set 2) unencrypted version available
315-5179 Robo-Wrestle 2001 not decoded yet
317-0005 Space Position not decoded yet
317-0006/7 Gardia not decoded yet
???-???? Gardia bootleg not decoded yet
317-5012 Ganbare Chinsan Ooshoubu MC-8123A
317-0014 DakkoChan Jansoh
317-0029 Block Gal NEC MC8123B 651 packaged like
System16's 68000
317-0030 Perfect Billiard
317-0042 Opa Opa
317-0043 Wonder Boy Monster Land
317-0054 Shinobi (sound CPU) NEC MC8123B 651
317-0057 Fantasy Zone 2
317-0064 Ufo Senshi Yohko Chan
Ninja Kid II sound program also seems to use this
encryption
317-5012 Ganbare Chinsan Ooshoubu NEC MC-8123A
317-0014 DakkoChan Jansoh
317-0029 Block Gal NEC MC-8123B 651
317-0030 Perfect Billiard
317-0042 Opa Opa
317-0043 [3] Wonder Boy Monster Land
317-0054 [2] Shinobi (sound CPU) NEC MC-8123B 652
317-0057 Fantasy Zone 2
317-0064 Ufo Senshi Yohko Chan
317-0066 [1] Altered Beast (sound CPU)
??? [3] Ninja Kid II (sound CPU)