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Type: Driver
File Name: apple_all_24877.zip
File Size: 10.0 MB
21 (4.28)
Downloads: 19
Supported systems: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows 2008, Windows Vista
Price: Free* (*Free Registration Required)

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AppleBus[ edit ] Early during the creation of the Macintosh computer, the engineering team had selected the fairly sophisticated Zilog to supply serial communications. This was initially done to allow multiple devices to be plugged into a single port, using simple networking protocols implemented inside the to allow them to send and receive data with the host computer.

PS/2 and serial in ought to work at the same time · Issue #32 · alangarf/apple-one · GitHub

With no card slots, the Macintosh was unable to easily add support for Ethernet or similar local area networking standards. Work on AppleBus was re-directed to networking purposes, and Apple All Serial PS released in as the AppleTalk system.

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This left the Mac with the original single-purpose mouse and keyboard ports, and no general-purpose system for low-speed devices to use. Special-purpose uses include software protection dongles and even Apple All Serial PS TelePort modem. Subsequent models use a USB-based trackpad. Physical[ edit ] In keeping with Apple's general philosophy of industrial design, Apple Desktop Bus was intended to be as simple to use as possible, while still being inexpensive to implement. A suitable connector was found in the form of the 4-pin mini-DIN connector, which is also used for S-Video.

The connectors are small, widely available, and can only be inserted the "correct way". They do not lock into position, but even with a friction fit they are firm enough for light duties like those intended for Apple Desktop Bus. This is included Apple All Serial PS allow a key on the keyboard to start up the machine without needing the Apple Apple All Serial PS Bus software to interpret the signal. In more modern designs, an auxiliary microcontroller is always kept running, so it is economical to use a power-up command over the standard USB channel. Most serial digital interfaces use a separate clock pin to signal the arrival of individual bits of data. However, Wozniak decided that a separate wire for a clock signal was not necessary; and as Apple Desktop Bus was designed to be low-cost, it made economical sense to leave it out.

Like modems, the system locks onto the signal rise and fall times to recreate a clock signal. The decoding transceiver ASIC as well as associated patents were controlled by Apple; this required vendors to work more closely with Apple. Communication[ edit ] The Apple Desktop Bus system is based around the devices having the ability to decode a single number the address and being able to hold several small bits of data their registers. All traffic on the bus is driven by the host computer, which sends out commands to read or write data: These requests take the form of single- byte strings. The upper four bits contain the address, the ID of one of the devices on the chain. The four bits allow for up to 16 devices on a single bus.

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The next two bits specify one of four commands, and the final two bits indicate one of four registers. The commands are: To a mouse this means "tell me the latest position changes".

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Registers can contain between two and eight bytes. Register zero is generally the primary communications channel.


Registers one and two are undefined, and are generally intended to allow 3rd party developers to store configuration information. Register three always contains device identification Apple All Serial PS. Enumeration and identification[ edit ] The addresses and enumeration of the devices are set to default values when reset. When the machine is first powered on, the ADB device driver will send out talk commands asking each of these known default addresses, in turn, for the contents of register three.


If no response comes from a particular address, the computer marks it dead and doesn't bother polling it later. If a device does respond, it does so by saying it is moving to a new randomly selected higher address.

The computer then responds by sending another command to that new address, asking the device to move to yet another new address. Once this completes, that device is marked live, and the system continues polling it in the future. Once all of the devices are enumerated in this fashion, the bus is ready to be used. Although it was not common, it is possible for the Apple Desktop Bus bus to have more than one device of the same sort Apple All Serial PS in — two graphics tablets or software copy protection dongles, for instance. In this case when it asks for devices on that default address, both will respond and a collision could occur.

The devices include a small bit of timing that allows them to avoid this problem. After receiving a message from the host, the devices wait a short random time before responding, and then only do so after "snooping" the bus to make sure it was not busy. With two dongles plugged in, for instance, when the bus is first setting up and queries that address, one of them will be the first to respond due to the random wait timer. Apple has produced several lines of printers in its history, but no longer produces or supports. LaserWriter 16/ PS, PostScript The StyleWriter was the first of Apple's line of inkjet serial printers, targeted mainly towards consumers.

All but a few models contained Canon print engines, a few were rebadged Canon. Apple Desktop Bus is a proprietary bit-serial peripheral bus connecting low-speed devices to Like the similar PS/2 connector used in many PC-compatibles at the time, Apple Desktop Bus Apple All Serial PS rapidly replaced by USB as that It is used on all Apple Macintosh machines starting with the Macintosh II and Macintosh SE.

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