Hardware
This project is using the STM32F0DISCOVERY board, which is $8 from digikey and comes with a little perfboard. With any luck, whatever comes out of this project will be cheap, and not require a separate PCB, making it fairly accessible.
The stm32f0discovery is a 3.3V device with 5V tolerant GPIOs. The mac keyboard interface is 5V, so I need a level converter. I'm currently using this cheap converter from adafruit. It comes on a little PCB with headers and can be attached to the stm32f0discovery's perfboard easily. There was some concern about whether this could handle the speed of the keyboard protocol, but it appears to not be a problem at all.
The Mac keyboard plug is an RJ11 4P4C connector, meaning it's a little telephone jack with only 4 positions (and all 4 are connected). Most telephone cords have RJ11 6P4C connectors (6 position, 4 conductor) which means they are wider than will fit in the keyboard plug. Typically those coiled cables that connect old handsets to their base phone are 4P4C connectors and will work for making a cable.
PS2 ProtocolThis was an invaluable asset when implementing the PS2 side of things. Pretty much everything needed is there. My implementation uses the same level converter above, and implements the PS2 side of the protocol by just polling the data and clock lines. I'm mapping the PS2 Scan Code Set 2 to the macintosh scan codes defined in Inside Macintosh Volume III. I do support both keyboard to host and host to keyboard. It does support toggling the capslock LED.
Building itBuilding one of these is pretty simple. The stm32f0discovery comes with a perfboard, and I used two level converters, plus the mac keyboard cable and ps2 keyboard cable, and some wires:
Parts:
Update 7/22/2013PCBs arrived:
I've also updated the code to handle some of the keypad keycodes. The keypad appears to have evolved between the initial release of the keypad, and the release of the Plus extended keyboard. This has the arrow keys working, the numbers, enter, '.' and '-'. There's not really a good mapping for the "Clear" key on the keypad. I guess a PS2 numlock key could suffice, since it's in the same location?
Update 8/19/2013New revision! This time without the level converters, and with mouse support! I found the level converters were not necessary, and were a large part of the price of the board.
The Mac mouse uses a rotary quadrature for the mouse movement. It allows the mouse to be exceptionally simple, but can stump emulating it. The approach I used was to take advantage of one of the signals being an interrupt. Essentially, there are 2 signals for each axis. One signal for each axis is used to generate an interrupt on the rising and falling edge. The direction is determined by whether it is a rising or falling edge, and the state of the other signal. So rather than trying to generate 2 pulses out of phase with each other, then worrying about determining direction, I simply make sure the non-interrupt line is in the state I want it to be in prior to transitioning the signal used as the interrupt.
The TI-83 Plus Family and TI-84 Plus Family graphing calculators do not have built in functionality in order to perform unit conversions, however you can load an application called the Science Tools App which contains a unit converter.
When you use a Windows (PC) keyboard on a Macintosh computer, the keyboard shortcuts that you use map to different keys. In particular, the primary key that is used in keyboard shortcuts in combination with other keys is frequently different. The following are the primary key substitutions on the Windows keyboard, and their Macintosh equivalents.
The M.2 slot can support a SATA M.2 SSD, a NVMe M.2 SSD or both. But your SATA interface in the computer ONLY provides SATA.
That makes a simple passive converter from SATA to M.2 SATA possible (it is just a mater of connecting the correct wires), but that won't magically turn a SATA interface into an NVMe interface so that 1 TB SSD isn't going to work.
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MPK Mini Plus features 37 keys with the Gen 2 Dynamic Keybed for expanded melodic and harmonic creation. 3 full octaves for two-handed chords, arpeggiation, solos and soundscapes on incredibly playable keys with a wider velocity range, delivering a world-class level of note dynamics and response.
With more keys, your music will need new ways to add feel and expression, so the MPK Mini Plus adds dedicated Pitch Bend and Modulation Wheel controllers to help all keyboard performances truly come alive.
Language input keys, which are usually found on Japanese and Korean keyboards, are keys designed to translate letters using an input method editor (IME). On non-Japanese or Korean keyboard layouts using an IME, these functions can usually be reproduced via hotkeys, though not always directly corresponding to the behavior of these keys.
The keyboards for NEC PC-9800 series, which was dominant in Japan during the 1980s and early 1990s, have three language input keys: kana, NFER (no transfer, same as nonconversion), XFER (transfer, same as conversion).[2]
A standing desk converter lets you quickly raise or lower the desktop to alternate between sitting and standing throughout your workday. Researchers recommend sitting and standing for equal periods of time each day, or, at the highest ratio, sitting for 15 minutes and standing for 45 minutes every hour.
On the other end of the spectrum, standing desk converters typically raise the keyboard platform between 14 and 15 inches for standing work; coupled with the height of an average desk, this means they best accommodate people who are about 6-foot-2 or shorter. Taller people will be better off with a fully adjustable desk.
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