I was looking online to see if there is a way to upgrade PRG size on an original Namcot board instead of hacking a mmc3?
http://forums.nesdev.com/viewtopic.php?f=28&t=13990
Idealy I would like to add extra hardware but havent found anything for Namcot108
https://wiki.nesdev.com/w/index.php/Use ... r_thoughts
I'd like to try a Megami Tensei: DDS English translation.
Anyone successfully made this repro?
Thanks
iNes mapper 76 with 256 KiB?
Moderators: B00daW, Moderators
Forum rules
1. NO BLATANT PIRACY. This includes reproducing homebrew less than 10 years old, with the exception of free software.
2. No advertising your reproductions, with the exception of free software.
3. Be nice. See RFC 1855 if you aren't sure what this means.
1. NO BLATANT PIRACY. This includes reproducing homebrew less than 10 years old, with the exception of free software.
2. No advertising your reproductions, with the exception of free software.
3. Be nice. See RFC 1855 if you aren't sure what this means.
- krzysiobal
- Posts: 1037
- Joined: Sun Jun 12, 2011 12:06 pm
- Location: Poland
- Contact:
Re: iNes mapper 76 with 256 KiB?
What parts are available?
Decoder: 74139 / 74138
Latch: 74161 / 74670 / 74273 / 74174 / 7474
I think you would need around 4-5 chips, this is my opinion not worh doing that way.
Single PAL16L8 can do the trick.
I made two PAL16L8 fusemaps (don't forget to connect externally LOOPIN and LOOPOUT):
*first one (mmc3_predecessor_prg_a17) can be used to add PRG-A17 to your mapper:
*second one (mmc3_prg_a19) can be used to add PRG-A19 to regular MMC3 (it even respects the PRG swap bit!):
GAL16V8 is for 0.22$/piece on aliexpress
Decoder: 74139 / 74138
Latch: 74161 / 74670 / 74273 / 74174 / 7474
I think you would need around 4-5 chips, this is my opinion not worh doing that way.
Single PAL16L8 can do the trick.
I made two PAL16L8 fusemaps (don't forget to connect externally LOOPIN and LOOPOUT):
*first one (mmc3_predecessor_prg_a17) can be used to add PRG-A17 to your mapper:
Code: Select all
._____ _____.
| \__/ |
CPU_nROMSEL -> | 1 20 | -- VCC
CPU_RnW -> | 2 19 | -> LOOPOUT ------+
CPU_A14 -> | 3 18 | NC BREG7 |
CPU_A13 -> | 4 17 | NC BREG6 |
CPU_A0 -> | 5 16 | NC IO4 |
CPU_D4 -> | 6 15 | NC BSEL2 |
CPU_D2 -> | 7 14 | NC BSEL1 |
CPU_D1 -> | 8 13 | NC BSEL0 |
CPU_D0 -> | 9 12 | -> PRG_A17 |
GND -- | 10 11 | <- LOOPIN -------+
|______________|
Code: Select all
._____ _____.
| \__/ |
CPU_nROMSEL -> | 1 20 | -- VCC
CPU_RnW -> | 2 19 | -> LOOPOUT ------+
CPU_A14 -> | 3 18 | NC BREG7 |
CPU_A13 -> | 4 17 | NC BREG6 |
CPU_A0 -> | 5 16 | NC BSEL6 |
CPU_D6 -> | 6 15 | NC BSEL2 |
CPU_D2 -> | 7 14 | NC BSEL1 |
CPU_D1 -> | 8 13 | NC BSEL0 |
CPU_D0 -> | 9 12 | -> PRG_A19 |
GND -- | 10 11 | <- LOOPIN -------+
|______________|
-
- Posts: 99
- Joined: Wed Jan 24, 2018 12:04 pm
Re: iNes mapper 76 with 256 KiB?
I only have a superpro 610p for programming.
What would i need to program those logic array ic?
What would i need to program those logic array ic?