I-PAC | Key Codes | Programming | I-Pac F.A.Q



What software can I use?
The unit was designed around MAME and normally you would use a front-end menu for selecting games. But of course, as the I-PAC emulates a real keyboard (without all the drawbacks) you can use any PC application which uses keyboard input.

Can I use other emulators?
Yes. You can use the fully programmable code sets of I-PAC to customise for any emulator or other application. The popular front end/launcher program MAMEWAH which can be found here even has integrated support for downloading I-PAC codesets on-the-fly.

Do I have a lot of setting up to do before playing?
NO. Using the key-code programming is entirely optional. When the board is shipped, all codes are automatically assigned to MAME standard keys. As many people have found, this makes installation very quick and easy.

What are the other alternatives?
One method is to hack a keyboard, i.e. connect all the controls to the keyswitches so each button appears as a key. This is pretty unsatisfactory for several reasons: It takes ages to wire up as 2 wires need to be run to each switch.
Most arcade cabs have one side of all switches commoned so you have to re-wire everything.
Key Ghosting: This happens because of the matrix nature of keyboard encoders.
Extra buttons: With this solution, with some emulators you have to have extra buttons on the cabinet for functions such as "escape", "insert coin" etc. Nobody likes drilling extra holes in their nice original arcade cab!
Speed: Keyboard encoders use a scanning method. So each key is checked in sequence for a press or release. I-PAC does not use a matrix or scanning.

What is the "shift button"?
Shifted function keys will do various functions ie press "1 player start" and "fire" and you will insert a coin. Press "1 player start" and "2 player start" and you will jump back to the menu. You can also use the MAME game config menus with shift buttons, ie tab and enter are shift joystick right and left. The 1 player start button is always the shift button if you are using the standard MAME codes. In programmable mode you can assign any input to be the shift button and you can program all of the buttons to have shifted codes. The unique feature of the shift function is that it requires no dedicated extra button.

How do programmable keycodes work?
When the board is shipped it contains all standard MAME codes including the shift codes mentioned above. If you only ever use MAME and want a quick and easy install this will probably do for you. But if you need to, you can re-program as required, including "on the fly", and the board will remember your new settings.

Why would I need to program the board?
You may find you need to change the assignment of keys for other emulators or maybe you don't want to have the shift functions of the MAME code set. The code set can be programmed either using a DOS or Windows utility on the PC or using the interactive programming method. Programming details here.
Normally you would install and test the board before getting into programming.
What is "test mode"?
Test mode can be entered using a special hot-key combination. This enables a display of buttons which are pressed, or may be shorted. This is to help with installation and troubleshooting. Details here.

Do I need to use a normal keyboard as well?
You can use a normal keyboard connected to the pass-thru connector. But if everything is set up properly with the PC booting into an emulation front-end menu, and each game is configured correctly, you can do everything with the standard controls on the cabinet.
The PC will pass the keyboard self-test with or without the aux keyboard. Key-codes from the auxiliary keyboard are fully "interleaved" with the codes from the I-PAC so both can be used at the same time and the 3 LEDS on the auxiliary keyboard are functional.
Being interrupt-triggered, the pass-through keyboard connector does not "steal" any CPU cycles whatsoever from the interface while the keyboard is idle so there is no impact on performance at all.


What about key-repeat (Typematic)?
In USB mode key repeat is supported as on a normal keyboard and is handled by the PC. In PS/2 mode key repeat is not generally desirable for gaming because sending unnecessary strings of key-presses to the PC can cause unwanted clutter on the PS/2 interface and steal CPU cycles. It is useful though to have key repeat outside of gaming, for example for scrolling up and down game lists in a front end. The I-PAC solves this problem by implementing a selective repeat on up/down only, for scrolling through lists. If you have a need for repeat on all inputs, this can be supplied on request.

Are 28 Inputs enough or do I need the I-PAC4 56-input board?
The answer is almost certainly yes for a 2-player cabinet. Remember that an 8-way joystick uses only 4 inputs (the diagonals hit 2 switches at once). So with two sticks you can also have 20 buttons. A normal sized 2-player control panel would get very cluttered with this number. Most people go for 6 per player which gives plenty of spare inputs for 1 player start, 2 player start and coin. A 4-player cabinet would need the I-PAC4 board (and a large panel!).

What about LEDs?
To complete your control panel why not mount 3 LEDs? A pre-assembled harness is available with LEDs in black conical bezels similar to those used on early Atari games. The LEDs emulate the Caps/Num/Scroll lock keyboard LEDs. What these LEDs actually do depends on the game. In MAME some games flash the LEDs to indicate coin credits. Some games use the LEDs for indicating "power-up" or rapid fire status etc.


Will it work on a MAC?
Yes the I-PAC will work on a MAC with USB. There is even a Mac version of the programming utility.


More about programming:
Alternative key code sets can be programmed and stored. The programming can be done either via a utility on the PC or using the built-in Interactive Mode. You can assign the key code for each input in shifted or unshifted mode and select which of the inputs is the shift button. After assigning all the buttons, the codes are downloaded to the I-PAC and stored in EEPROM which keeps the settings even after power-off. The settings are also written to a file so you can have as many of these configuration files as you want and download as required, either manually or automatically via a batch routine. Click here for more info about programming. There is no practical limit on the number of times the EEPROM can be re-written. In fact the chip manufacturer guarantees one million R/W cycles, but in practice the actual limit would be even higher.