Something I've started to work on only recently but done a lot of progress.

30 official games known on this system:
- Ace Attacker
- Action Fighter
- Alien Syndrome
- Altered Beast / Jyuohki
- Aurail
- Bay Route
- Bullet
- Cotton
- Dunk Shot
- Dynamite Dux
- E-Swat
- Excite League
- Flash Point
- Golden Axe
- Heavyweight Champ
- M.V.P.
- Passing Shot
- Riot City
- Ryu Kyu
- SDI
- Shinobi
- Sonic Boom
- Sukeban Jansi Ryuko
- Super League
- Tetris
- Time Scanner
- Toryumon
- Tough Turf
- Wonderboy III Monster Lair
- Wrestle War

Plus 2 "exclusivities":
- Bloxeed (extracted from a PS2 compilation)
- Fantasy Zone (extracted from a PS2 compilation)

Some games are protected with an encrypted 68000 CPU, others with an i8751 MCU, some with no protection at all.

4 different romboards known:
- 171-5521
- 171-5704 (identical to 171-5521 but with different jumper settings)
- 171-5358
- 171-5797
I've been able to reproduce the 171-5358 (no custom chip, no banking) and 171-5521/171-5704 (tile banking made with a PLD and few TTL chips).
The 171-5797 contains a QFP custom chip so I put it aside from now.

By choosing the appropriate romsets all games except Torymon can be played on the same custom designed romboard.
At the moment I have 2 prototypes:
- one for 171/5521/171-5704 based games
- one for 171-5358 based games
But with some more logic I think the 2 types can be combined (with a hardware banking enabling/disabling function). I haven't looked at a software solution yet so this could also be a solution (some games were launched on more than one romboard type).

Given the fact my multi M72 testing is on hold this project might progress faster than expected.

Also I still have to:
- fully test the decrypted sets for Dunk Shot, Sukeban Jansi Ryuko, Super League
- patch Tough Turf to bypass the i8751 MCU
- find a way to run Toryumon on a different romboard than 171-5797 (probably not the most desired game in the list but I'd like to tackle it for the sake of completeness)

First prototype in action:




Most current wait list:

ekorz (V1 & V2) (Shipped 1/25/20)
rewrite (Shipped 1/27/20)
98pacecar (Pass)
Derick2k * 2 (SHIPPED 1/28/20)
mastercello (Shipped 1/25/20)
Nodoyuna (Shipped 1/27/20)
zizer (Shipped 1/25/20)
Denson (Pass)
Frank_fjs (Shipped 1/25/20)
xodaraP * 2 (v1 and v2) (V1 Shipped 2/4/20)
djsheep (Shipped 2/4/20)
oneleaf86 * 2 (v1 and v2) (Shipped 4/15/20)
Blackfish (Pass)
archimage (V1 and V2) (Shipped 4/15/20)
sk8er000 (Shipped 4/22/20)
twistedsymphony (v1 and v2) (Shipped 4/21/20)
Astro X * 2 (Shipped 4/22/20)
glstar *2 (Shipped 4/24/20) (Shipped 5/29/20)
CPZ - SAVEYOURGAMES * 2 (Shipped 5/18/20)
Yippikaye (Shipped 4/28/20)
Invader (Shipped 5/16/20)
Sp33dFr34k (Shipped 5/19/20)
KalessinDB (Shipped 5/19/20)
jepjepjep (Shipped 5/20/20)
friedpotatoz (Shipped 5/26/20)
udongein (Pass)
Darksoft (Already got a proto, will get a V1 later)
aoiddr (Shipped 5/19/20)
kuze (Shipped 5/19/20)
ShootTheCore (Shipped 5/19/20)
-Ace- (Shipped 5/19/20)
bradtemple87 (v2)
jassin000 * 2 (v1 and v2) (Already got a proto, and is fine with it)
remvel (Inactive?)
Gakman (Inactive?)
Dakken * 2 (v1 and v2) (Shipped 5/26/20 - V1)
LHantz (Shipped 5/26/20)
funkycochise (Shipped 5/27/20)
penrhos (Shipped 6/1/19)
christo (Shipped 5/29/20)
Geddon (PASS)
tom5151 * 2 (v1 and v2) (Shipped v1 5/29/20)
AlxUnderBase * 2 (v1 and v2) (Shipped 5/29/20 v1)
Reechard (No response)
ThisGuy * 2 (v1 and v2) (Shipped 5/29/20 V1)
rtw (v1 & v2) (Shipped 5/29/20 v1)
NeoXbit (PASS)
SiQux (Shipped 5/29/20)
Cheatinn (PASS)
raidenmaniac1 * 2 (v2)
Damsrpg (No response)
redijedi808 (Can't find user???)
kidpanda (Shipped 6/8/20)
Hoagtech (Shipped 6/11/20)
xmas (Shipped 6/8/20)
radiantsvgun(Shipped 6/15/20)
nonosto (V1 & V2) (Shipped 6/18/20)
Smurph * 2 (Shipped 6/15/20)
Sabin (V1 & V2) (Shipped 6/18/20)
gusmoney (PASS)
bagheera369 (Shipped 6/15/20)
riley81520 (PM sent, inactive since Sept 2019)
kebrank (V1 *2 & 2) (Shipped 6/15/20)
KRG (Shipped 6/17/20)
mncmt (V1 & V2) (Shipped 6/18/20)
asra (v1 *2 & v2) (Shipped 2 on 6/25/20)
KAKAKOKEOKUKU (Shipped 6/25/20)
opt2not ("v1 and v1 only") (Shipped 6/20/20)
WhiteCrow (Shipped 6/30/20)
MoppelTheWhale (V1) (Shipped 7/14/20)
beast1x5 swapped with Derick2k(v1) (Shipped 6/29/20)
theoddtech (Shipped 7/28/20)
Asure (PASS)
StalkS (Shipped 7/14/20)
Yukari Tamura (Shipped 7/17/20)
frsj8112 *2 (Shipped 7/17/20)
zeruel85 (PASS, moved at the bottom)
brentradio (PAID 8/02/20)
blahjedi (PASS, moved at the bottom)
Mizo (Shipped 7/21/20)
kingau (Shipped 7/20/20)
Richmal (PASS)
90sCyberThriller (Shipped 7/20/20)
owlnonymous (PASS, still wants a V2)
sneek (Shipped 8/1/20)
FairWitness (Shipped 7/20/20)
philsublime (Shipped 7/21/20)
8bitforlife * 2 (v1 and v2) (PASS, moved at the bottom)
lorenzo2mars (Shipped 4/15/20)
SEGASHIRO (PASS)
segasonic91 (No answer, holidays?)
c0nn0r (PM sent 08/01/20, inactive since feb 20)
nio (Shipped 8/7/20)
acblunden2 (Shipped 8/10/20)
Riksho (No response/inactive)
Smurph (Shipped 8/11/20)
Pelly (Shipped 8/10/20)
psyko-m1 (v1) (Shipped 8/10/20)
enkonsierto (v1) *2 (Shipped 8/19/20)
speedswan (Shipped 8/12/20)
CoinFeeder (Shipped 8/21/20)
Shuutarou (v1) (Shipped 8/17/20)
u72 (v1) (No response)
ccatalyst * one v1 & one V2 (Shipped 09/08/20)
caldwert (Shipped 8/21/20)
waiwainl (Shipped 8/22/20)
r-type (Shipped 09/05/20)
radirgyman (V1) (No response/inactive?)
truxpin (V1) (Shipped 09/05/20)
slickam (Shipped 09/02/20)
TravistyOJ (Shipped 09/02/20)
Solmin (Shipped 09/05/20)
MinkeyB (No response, inactive?)
mathewbeall (Shipped 09/02/20)
mbandala (Shipped 9/21/20)
D_N_G (Shipped 09/08/20)
Jim_Pansenmann (No response)
rsignal (now pacoarcade)(V1) (Shipped 9/21/20)
ezbman (No response)
chrisapple (V1) (Shipped 10/5/20)
EVAWINGZERO (pass)
neofrank (No response)
yodamingus (PAID 10/19/20)
takosuke (plus C2 multi) (Shipped 9/28/20)
buffaloj0e (Shipped 9/28/20)
segasonic91 (no response)
keeperUSA (Shipped 9/28/20)
evidencedj (Pass)
ryan tiger (email) (Shipped 9/28/20)
mikehoss1414 (no response)
Nimmers (Shipped 9/28/20)
McKie1 (Shipped 9/28/20)
GreenMonkeyKing (PASS)
Psychicdrive (Shipped 9/28/20)
chacal231077 (Shipped 10/2/20)
Panzerfaust (v2 only)
Littlelarrysellers (Shipped 9/26/20)
Kratt x 8 (v1) (Shipped 11/2/20)
BlackLord (Shipped 10/19/20)
Fivestars (Shipped 10/29/20)
moorebwb (v1 & v2) (Shipped 10/26/20)
mpatou (Shipped 10/24/20)
Macck (Shipped 11/2/20)
Kyosuke75 (V2)
Hardyhell (PASS)
kavas (Shipped 11/2/20)
damasco94 (Shipped 12/1/20)
sugar4salt (Shipped 11/2/20)
rg111 (v1 + v2)
xtrasmiley (Shipped 11/6/20)
Lolo-san (M72 also) (Shipped 11/9/20)
jord4n313 (Feeler sent 11/3/20)
Mackie (Shipped 11/18/20)
the Goat (Shipped 11/4/20)
Bay78 (Shipped 11/6/20)
GEX (Shipped 11/6/20)
rocket (Shipped 11/9/20)
stt1 (Shipped 11/13/20)
Starcade (PASS)
laevateinn (Shipped 11/4/20)
jamesv833 (Shipped 11/9/20)
mtg1275 (no response)
atom33 (PASS wait v2)
Jangofatt (Shipped 11/13/20)
Arcadeqc (Shipped 11/18/20)
edb (PM sent)
duffcon (Shipped 11/18/20)
somkey1054 (Shipped 11/18/20)
Taulpaul x 4 (no response)
Sammargh (Shipped 11/23/20)
Tym01 (PM sent)
Generalgau (feeler sent)
Retrosnatcher (feeler sent)
Atari (email) *2 (Shipped 12/2/20)
coyo5050 (feeler sent)
Galford (feeler sent)
Dvseb
nnap
battlesmurf (v1 + v2)
euphoria (v1 or v2)
BladeZX
Rootuser (v1 and V2)
robot
jbrill (v1 & v2)
Dylan (Shipped 6/22/20)
aramis
Hepgeek
Bfontain
crkz666
geosnow
kapheen
zitoun
Decoryah (v1 & v2)
evilsim
benime
zionfarm
cedran
dexster
flex
lemony vengeance
mthngn
jimushi10
kryssss
Be_nO
fafar10 (v1 & v2)
Phrax
Goemon59 *4
EEL-MAN
darhgo
Dlang1987 (v1 & v2)
rickbonano
hamster
futasan (v1 & v2)
dennydevito
mcdohl
merrygoomba (v1 & v2)
rthorntn (v2)
randomretro
glossectomy
geekman1222
Codex
mugen_ketsueki
Cooljerk
kynrek
zeruel85
8bitforlife * 2 (v1 and v2)
blahjedi
LemmyBarnett
DarthMig
Alexandero78
Trol
Hieroneus
ben.shinobi
TMF68K *2
kikaso (v1 & v2)
ositobear1
JinQ
Dbstallman
parodius
johnfan1986
arcadeaction
marian
PlayYing
Scott Mitchell (email)
p4ck3t
chelnov
Pinball
Chelnov
mbg
Flinnster
skipkfc
jumpingmanjim
MikeH482
drago
varvar *3
seunghoon ahn
dos
haracker *2
Swisstoni69
Escarioth x1

Extra info about multi kit versions:

V1 = games (not included, users have to find files on their own) stored in EPROMs, one version of each of the 30 official S16B games supported plus 2 additional games extracted from a PS2 compilation developed/ported for a S16B emulator (32 different games in total)

V2 = games stored on SD card, keys restore (with compatibility restrictions depending of the FD module you have, keys can only be restored for the module they were intended to be programmed to), supports all romsets except those with a MCU or encrypted sound CPU

V1 is ready for production, we're just waiting for made to order connectors to be manufactured.
V2 has no release date yet, prototype is far from final, although all functionalities have been tested and validated.

FD modules compatibility:

Here's the romset list for each processor type:

FD1094
aceattac
altbeast5
altbeastj3
altbeastj1
bayroute
bayroutej
bullet
cotton
cottonu
cottonj
cottonja
ddux
dduxj
eswat
eswatu
eswatj
eswatj1
exctleag
fpoint
fpoint1
goldnaxeu
goldnaxej
goldnaxe3
goldnaxe1
hwchampj
mvp
mvpj
passsht
passshta
passshtj
ryukyu
shinobi2
sonicbom
suprleag
tetris2
tetris1
wb34
wb33
wb32
wrestwar2
wrestwar1

FD1089A
afighterh
aliensyn3
aliensynj
aurailj
dunkshot
dunkshota
dunkshoto
defense
sdib

FD1089B
afighterf
afighterg
aurail1
sjryuko

Standard
afightere
aliensyn
aliensyn7 (encrypted sound CPU MC8123)
altbeast (i8751 protection chip)
altbeastj (i8751 protection chip)
altbeast6 (i8751 protection chip)
altbeast4 (encrypted sound CPU MC8123)
altbeast2 (encrypted sound CPU MC8123)
aurail
bayroute1
ddux1 (i8751 protection chip)
goldnaxe (i8751 protection chip)
goldnaxe2 (i8751 protection chip)
hwchamp
cencourt (encrypted sound CPU MC8123)
riotcity
sdibl
shinobi5
shinobi4 (encrypted sound CPU MC8123)
shinobi3 (encrypted sound CPU MC8123)
timescan
toryumon
tturf (i8751 protection chip)
tturfu (i8751 protection chip)
wb3 (i8751 protection chip)
wrestwar (i8751 protection chip)
=> plus Bloxeed and Fantasy Zone

I should be able to test if an encrypted module can run as a standard CPU by writing its entire RAM with 0x40 as suggested by Eduardo.
=> Not working... For now?
So far best compatibility is FD1094 (20 different games over 32).

I knew you were going to react first

Which one? Hardware or software solution? Hardware solution I'm sure it will work.

I'm glad to see so much interest but there's still a lot of work to do.

You're too late mate, I already chose a partner who has no balls and I'm not looking for change