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- The NINTENDO PC INTERFACE SYSTEM is a hardware device designed
- several years ago by my brother and myself. My original
- intention was to create a way to transfer game software contained
- in Nintendo cartridge ROMs to PC disk files where they could
- later be downloaded to a "universal cartridge", a regular
- Nintendo cartridge whose ROMs are replaced with battery-backed
- static RAMs. This relatively simple idea seemed to me the best
- solution to the many problems associated with my previous method
- which utilized an EPROM programmer and a socketed cartridge.
-
- While this system in its present form works flawlessly on those
- first generation Nintendo cartridges for which it was designed,
- the newer, larger memory ROM cartridges' diverse addressing
- formats made designing a single integrated system a nightmare to
- someone of my limited design experience. Part of the incentive
- for going public with this system is to possibly inspire others
- to improve upon what we've started.
-
- WARNING!
-
- This is NOT a good electronics project for beginners for several
- reasons. One being that, in these directions, I have assumed the
- builder is familiar with the reading of schematics. These
- instructions are far from being detailed. Secondly, with so many
- soldered bus connections, the most experienced assembler is bound
- to run into problems which can only be troubleshot with a VOM and
- an abundance of patience. I can just see hundreds of pissed-off
- hobbyists writing me nasty letters because of their own crossed
- wire. I tried my best to double-check the accuracy of my
- schematics with that of my prototype, but knowing that anything
- can happen, I'll be prepared to answer any reasonable requests
- for help.
-
- ********************
-
- There are five files included in this archived file.
-
- NINTEN.DOC - This documentation file with instructions and
- information (such as it is).
-
- NIN.EXE - This is the device driver for the unit written
- in assembly language.
-
- SCHEM1.PIC - The PIC file that displays the schematic for the
- PROGRAMMING MODULE. All the following picture
- files can be shown with CSHOW or other graphics
- display programs.
-
- SCHEM2.PIC - The schematic for the UNIVERSAL CARTRIDGE. This is
- a regular Nintendo cartridge that is converted in
- the process described below.
-
- SCHEM3.PIC - The schematic for the INTERFACE BOARD which plugs
- into an 8 bit expansion slot and connects to the
- PROGRAMMER MODULE via a 25 pin "D" connector.
-
- ********************
-
- CONSTRUCTING THE PROGRAMMER MODULE
-
- This is the unit that will actually have cartridges inserted into
- it. I used a plastic 2x3x6 Radio Shack project box. From the
- top edge of one of the 6" sides cut a 1 & 1/8 inch by 4.5" slot.
- Now for the bad news. The 72-pin connector that Nintendo uses is
- non-standard. I had to cannibalize a whole Nintendo System to
- use the actual zero insertion force connector built inside the
- unit. This I mounted to the bottom of the project box so that a
- cartridge could easily be inserted coming in at a downward angle
- then being pressed down to a horizontal position. Since this
- will be minus the spring loaded guiding mechanism of the Nintendo
- System, it's important that the 4.5" slot width holds the
- cartridge firmly in place while in the "down" position.
-
- The components are mounted on a 2x4 inch perf board. The D
- connector is mounted on the right side of the project box
- (slotted being front). Admittedly, things get a bit crowded. I
- used ribbon cable for bus lines directly soldered to a 72
- cardedge (just the "fingers") sawed off a cartridge board. This
- plugs into the lower slot of the connector. Keep the lines long
- enough to wrap around the bottoms and sides of the box to the
- component board that will ride on top of the connector.
-
- ********************
-
- CONSTRUCTING THE RAM CARTRIDGE
-
- The following is the process used to prep an existing Nintendo
- cartridge. As far as I know any of the games mentioned at the
- end of this doc file will work as a "ram cartridge" but to be
- sure you may want to use the game cart I did; SOCCER. The
- following directions are listed briefly on the schematic itself.
-
- 1) Remove solder bridge (V or H) to CE 22.
- 2) Remove both ROMs and replace with static rams 43256 (NEC) with
- the following pins pulled up: CHR ram - 20,27. PRG ram -
- 1,20,27.
- 3) Scribe a break in the 5 volt circuit path. Right above pin 16
- on the CIC chip is a good place. Jumper with the 1N4005. In
- the cartridge schematic that diode is the only component
- (besides the rams) mounted on the factory board. All
- others, including the battery, I put on a 1.75x1.75" card.
- 4) Jumper WE pins on CHR ram pin #27 to cardedge #19 and PRG ram
- #27 to cardedge #15. Jumper in the same way pin 1 on the PRG
- ram to the punched hole normally reserved for its pin 27.
-
- ********************
-
- CONSTRUCTING THE INTERFACE BOARD
-
- The interface board I used was not of my design. I used the card
- plugged into my PC's expansion slot that connects to my MIDI
- music system. This is simply a port address assigning driver
- board which means this system uses the same port addresses as a
- Roland MPU401 MIDI device. It should be easy to duplicate using
- a breadboard 8 bit PC card and the schematic provided.
-
- ********************
-
- RUNNING THE SOFTWARE
-
- Start the program by typing "NIN" at the prompt. This is the
- executable file containing the programmer's device driver written
- in assembly language by my brother, Jeff. For a printed copy of
- this code see "FOR FURTHER INFO" at the end of this doc file.
-
- NIN.EXE is a self-explanatory menu-driven program. To save a
- cartridge's software to a disk file: Place the cartridge to be
- copied into the programmer unit. Press "R" for "Read from port".
- This command places the software read from the cartridge's roms
- to a buffer in memory. NOTE: the program responds only to upper
- case. Next press "O". This command will be followed by a prompt
- asking you to name the file that will be created containing the
- data in the buffer.
-
- To download software from the disk file to the "ram cartridge":
- Firmly install the cartridge into the programmer unit. Press
- "I". This places data from the file into computer memory. Next
- press "W" to write data to the static rams in the cartridge.
- Carefully disconnect cartridge from the programmer. Set
- cartridge DIP switch to horizontal or vertical position depending
- upon game. Cartridge is now ready to be played in your Nintendo
- System.
-
- ********************
-
- DISCLAIMER
-
- This program and instructions are distributed as is without
- warranty. In no event will I be liable to you for any damages
- arising out of the use or inability to use said program or
- devices described herein.
-
- ********************
-
- MORE INFO
-
- Please keep in mind that, as previously mentioned, this device is
- limited to copying only older, smaller memory cartridges. In
- order to compete in the current video game market, Nintendo and
- its licensees presently use much larger memory ROMs in their
- games which involve dozens of varied addressing schemes. To
- design a single integrated programmer which would accommodate all
- these formats would require a much more sophisticated device.
- The following, while being far from complete, is a partial
- listing of those games that have worked successfully on my
- prototype: BASEBALL, GOLF, POPEYE, ICECLIMBER, DUCKHUNT, EXCITE
- BIKE, BURGERTIME, PINBALL, HOGAN'S ALLEY, DONKEY KONG JR., URBAN
- CHAMPION.
-
- For those of you who successfully complete the building of this
- system and would like to become a registered user, I will be
- happy to send you a disk containing the latest extended device
- driver which allows the programmer unit to accommodate 64K
- software cartridges without any change in its hardware. Just
- send a check or money order in the amount of $35.00 to:
-
- Gary Kibler
- 7902 Holt Avenue #7
- Huntington Beach, CA 92647
-
- The following is a partial list of those 64K games that have
- successfully loaded on my prototype with the extended driver:
- SUPER MARIO, KUNG FU, SLALOM, WRECKING CREW, ICE HOCKEY, SOCCER,
- TAGTEAM WRESTLING.
-
- As mentioned before, I am willing to respond to any reasonable
- requests for help or information provided you are a registered
- user. Being registered also entitles you to the documentation
- and code to both versions of the driver software. Just mention
- this request in your letter.