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Started by bigsanta, January 16, 2011, 06:46:04 am
Quote from: l_oliveira on January 18, 2011, 11:30:19 pmYou can build a super simple region mod with just a 74LS74 chip.Just need to rig it in a way it latches the reset button (and/or) the lit state at the time the power is turned on. It's principle of operation is simple as the LS74 chip is a flip flop (1 bit of memory). By connecting the clock pin to the master reset circuit and the input to either the reset pin or the lid switch you can make it remember what position the lid or reset button was when the console was powered on.The only drawback is that you get only two possible status. On my system (an JPN gray saturn) I connected half of it to make an JPN/USA switch. You turn the console on normally it boots as JPN. You turn it on while holding the front RESET button and it boots as an USA console. And it remembers that state until it's switched off.Post away my friend !If you're interested I may post the schematics.
Quote from: hellbelly on March 27, 2011, 06:47:58 pmWhen I wanted to do Sebs switchless mod, I picked up a cheapo serial port JDM programmer from ebay, it cost a couple of quid, but it looks like prices have gone up now :-(http://cgi.ebay.co.uk/Serial-PIC-programmer-8-18-28-40-pin-microcontrollers-/280591766654?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item415492947e#ht_3084wt_932I then got a cheapo Willem parallel port programmer so that I could mess around with MegaCD MultiBIOS and NeoGeo Unibios, it does the 16f630 also.Pete
Quote from: l_oliveira on March 25, 2011, 07:07:38 amConnect the MASTER RESET input of my circuit into pin 15 of the SMPC chip on the SATURN. That pin pulses only once when the console is powered on. I suggest you use the Reset button input (Pin 53 of the SMPC chip) as "toogle" for region changing. As you can hold the RESET button while powering on the system, the state of the flip flop will be locked with the state of the reset button at the time of the master reset.As the majority of discs I play are Japanese, I wired the two output wires in a way the console is Japanese when the system is powered on with the button released. If you hold it and power the system on, it changes to USA.The second 74LS74 can be omitted if you don't need it (50/60hz toggle)
Quote from: bigsanta on March 31, 2011, 06:54:26 amhttp://www.gamesx.com/wiki/doku.php?id=imports:sega_saturn .Can you explain the action/wiring of the "tray out" connection(on Q 2) 2nd flip flop for my 50/60 hz switching ?
Quote from: l_oliveira on April 01, 2011, 12:22:54 amQuote from: bigsanta on March 31, 2011, 06:54:26 amhttp://www.gamesx.com/wiki/doku.php?id=imports:sega_saturn .Can you explain the action/wiring of the "tray out" connection(on Q 2) 2nd flip flop for my 50/60 hz switching ?It's as simple as taking pin 12 of the 74LS74 chip to the tray switch signal and take one of the outputs of the flipflop chip to the PAL/NTSC selection pin.Depending of you wanting the lid to be open or closed to mean JPN discs, you connect either the inverted or not inverted output to the PAL/NTSC selection pin. Here's how you program the mod to work: You change how you wire it into the system. So,what IC is the tray signal found at?
Quote from: bigsanta on April 01, 2011, 08:37:24 amSo,what IC is the tray signal found at?