I have a design for Famicom hardware clone, I may or may not built it, or anyone else may or may not, this specification is public domain, I may work on software some time even if don't work hardware. The codename is "Famicom-XE" (for "Famicom Extra Edition") although they may be change due to trademark reason or other reason such as variations of this idea.
Console features:
Included devices:
Other devices, such as 72-to-60 adapter, game cartridges, light gun, mouse, etc could be obtained by third-party.
If I have resources I might try to make such things as this in case you want to buy it, or, even if you don't want to buy it. Since it is public domain if someone else make, and in case I never manage to do so, I may buy it from you, too.
PAL version could also be possible, which might omit some features listed above if there are any not suitable for PAL, but it would include both 60-pins and 72-pins, with CIC lockout to detect NTSC/PAL cartridge (with PAL as first preference, in case of multi-region CIC); if you insert 60-pins cartridges or 72-pins NTSC, then it use Dendy mode, if using PAL cartridge, it can use NES mode.
Console features:
- 60-pin slot to insert cartridge
- Controller I port, same as NES port
- Controller II port, same as NES port but with an extra pin, near but detached other pins (such that devices without this extra pin can still be connected), controlling bit2 of $4016
- 15-pin Famicom expansion port
- Composite video out
- Audio out
- Power switch
- Reset switch
- APU test switch
- Audio filter switch (applies filter to sound like the original Famicom; if turn off it make sound of NES)
- Internal PRG ROM which is active when no cartridge is inserted, uses internal VRAM for pattern tables and name tables (as the single-chip cartridge does), with programming features and possibly some other features (this software will be public domain)
Included devices:
- Game controller I (up, down, left, right, A, B, START, SELECT)
- Game controller II (up, down, left, right, A, B, START, SELECT, and microphone)
- Keyboard (compatible with Famicom keyboard)
- Development cartridge, with two programmable ROM and two RAM, as well as jumpers and/or small breadboard, to reconfigure the mapper
- RCA cables
- Power cables
Other devices, such as 72-to-60 adapter, game cartridges, light gun, mouse, etc could be obtained by third-party.
If I have resources I might try to make such things as this in case you want to buy it, or, even if you don't want to buy it. Since it is public domain if someone else make, and in case I never manage to do so, I may buy it from you, too.
PAL version could also be possible, which might omit some features listed above if there are any not suitable for PAL, but it would include both 60-pins and 72-pins, with CIC lockout to detect NTSC/PAL cartridge (with PAL as first preference, in case of multi-region CIC); if you insert 60-pins cartridges or 72-pins NTSC, then it use Dendy mode, if using PAL cartridge, it can use NES mode.