flashrom from what i have invested some time into now will and do work on cartridges, i currently have commando on a nes unrom cart with a flash am29f010 as the prg rom, the cart is that roomy i could put a small pcb with 6 or so flashroms on it and by dip switch i could enable and disable all the various flashroms, and enable different games. they run on 5 volts to run them and 12 volts to program them, the life of a flashrom is shorter than an eprom, that is true and you can only flash them 10,000 times which is more than enough.
i found that my friend in the pcb business prior to this new business created mini rack modems for a large telecommunications business here in australia, and has zquillions of these modems floating around, they have a microchannel input that attaches to the pc via a serial port and has a z80 processor onboard to process the incoming/outgoing data and has a 1megabit flash onboard which is reprogramable via pc software. the funny thing is this modem easily fits inside a nes cart and with a little mod could be used to program a flash or two on a nes cart, my friend says anyway but thats in the air, he is a very busy person so ill try this week to see if he has any time to see if he could look into this for me.
i have another query about carts and mirroring. does anyone know how to flip the mirroring on a cart which is third party cnrom equivalent but only has one type of mirroring on it, i dont know which one it is (it is unmarked) my galaga cart which i used a third party cart for was straight forward and just needed solder to be sucked off it and replaced on another connection above it, but this cart doesnt seem to have that other connection attached to anything.
its something like a nina-3 cart or something, ive put cybernoid into this cart and the graphics are a little glitched on the opening screens and with in the game occassionally. but mainly the opening screen is glitched. ive tried this game in a socketed cnrom cart with h-mirror enabled and it had the same glitches and changed it to v-mirror which fixed them without any mirror it becomes almost unplayable, the graphics become so corrupted.
the third party cart i have cybernoid in was made by home entertainment suppliers (australia) 1991 printed on it and the code ntd-2b
and has a 74ls161an chip on it too and has room for 3 other chips on it, obviously 1 cart design for many different games to be programmed onto it but as i said i guess its set to h-mirror or no mirror are the two options, what would i need to do to make it v-mirror enabled? what pins do i jumper?