Fighting Hero (NTDEC TC-112) mapper 193

[krzysiobal]

While wiki, basing on Disch's notes just points there exist this game, bootgod's page doesnt have it in neither database nor "missing" list.
Wiki's pinout and register list was not complete, so below are improved results.

BTW. My dump of this game differs from the Fighting Hero (Asia) (Unl) (CRC32 of Rom without header: 637134E8). I attach the patch to apply over that ROM to get my dump.

fighting hero.ips

(11 KiB) Downloaded 198 times

Code: Select all

Pins:
* 21 - CIRAM-A10
* 23 - external write strobe (/WR $6006)
* 24 - external write strobe (/WR $6005)

Registers:
$6000 [CCCCCC..] PRG Bank register

$6001 [DDDDDDD.] CHR Bank register 1

$6002 [EEEEEEE.] CHR Bank register 2

$6003 [...PPPPP] CHR Bank register 3

$6004 [.......M] Mirroring register
              |
              +-- 0=V, 1=H (power-up: H)
			  
$6005 [........] During write cycle, pin 24 goes LOW (external write strobe?)

$6006 [........] During write cycle, pin 23 goes LOW (external write strobe?)

$6007 [........] No effects (unused?) 

-------------------------------------------------------------------------------------

$8000 $a000 $c000 $e000
PPPPP 11101 11110 11111

   $0000    $0400    $0800    $0c00    $1000    $1400    $1800   $1c00
CCCCCC00 CCCCCC01 CCCCCC10 CCCCCC11 DDDDDDD0 DDDDDDD1 EEEEEEE0 EEEEEEE1

-------------------------------------------------------------------------------------

[lidnariq]

Any chance that pins 23 and 24 are low on reads as well?

[krzysiobal]

No, only during writes.
And Pin 35 is just the only one PRG /CE.
Pin 34 is CHR A17 (for use with single 256K ROM)

Wonder what's possibly use for those additional write strobes. Maybe for audio chip (and latch for storing sample number), like in this cartridge?
viewtopic.php?f=9&t=17478

And a little off-topic - I am also wondering about the pinout & description of NTDEC KC5373B-010 chip, found in some NTDEC games.
If that were just CIC, they wouldnt need diodes and huge capactiors. But if that's STUN, why not use transistors like Camerica did? Maybe the chip consists of inverters, discrete transistors or op-amp?

[lidnariq]

Speech/sound effect playback does seem most likely, given the restrictive PRG banking layout and oddly small max PRG capacity.

Other options include more latches to hold more banking bits, or an IRQ.

[lidnariq]

KC5373B-010 chip [...] Maybe the chip consists of inverters, discrete transistors or op-amp?

The internet seems to think that the KC5373B is "just" a CD4000... ??

[krzysiobal]

But it's DIP16, while all of those 74xx/40x gate chips come in DIP14 package.

[lidnariq]

Yeah, I just noticed that...

I've been able to find dozens of pictures of the component side of the N715061 and N715062 PCBs used by NTDEC's CNROM-class releases, but unfortunately not a single one of the solder side.

[krzysiobal]

Basing on the photos of La Guerra Del Golfo and knowing which pins of ROMs and TC-112 connect with each other, I was able to deduct how other pins go to this CIC stun chip.





Probably it is just some amplifier/negator. It gets PPU-A0 as source of high speed clock and then this diode/capacitor charge pump circuit generates -4V (simulation)

---

I found by accident that I previously analyzed another cartridge, based on this same CIC stun chip - Super Gun.
After confronting both PCBs I can say that the final schematic of the CIC stun circuit should be:

sch.png (6.51 KiB) Viewed 4636 times

(I noticed that both PCBs there are 2 additional pads allowing to solder DIL18 chip)