The clock port is a commonly used term for the
real-time clock interface of the
Amiga 1200 computer. The port is a remnant of an abandoned design feature for addition of internal RAM and a clock for time keeping. However, it was later widely used as a general purpose expansion port by third-party developers for devices, such as,
I/O cards, sound cards
and even a
USB controller.
Although a real-time clock can be connected to the port, the clock was typically added by other means (usually integrated on CPU or RAM expansions) which leave the clock port free.
The A1200 was the only Amiga model to have this unique 22-pin connector (some revisions of the A1200 motherboard have additional non-functional pins). However, as the address and data signals used by the interface are available through the internal expansion connectors of other Amiga models, clock port adaptors were later created by third-party developers for these systems. This enables owners of other popular models, such as the
Amiga 500 or
Amiga 600
The Amiga 600, also known as the A600, is a home computer introduced in March 1992. It is the final Amiga model based on the Motorola 68000 and the 1990 Amiga Enhanced Chip Set. A redesign of the Amiga 500 Plus, it adds the option of an internal ...
, to use the hardware created for this interface.
Due to the popularity of clock port devices, developers even included one or more compatible clock port interfaces on Amiga
Zorro boards to allow hosting such devices on these systems.
Essentially, the connector provides an 8-bit data interface with limited addressing.
Host hardware
* A600 1MB Expansion
* Real Time Clock Module
* 4-way Clockport Expander
* Amiga 1200
built-in (address $d80001)
* Zorro IV boards (also addresses $d84001, $d88001 and $d8c001)
* Clock port adapter for Amiga 500/1000
* Third party
Zorro bus
** Buddha flash
** VarIO
** DENEB
** HIGHWAY
** ISDN-Surfer
** X-Surf, X-Surf II
** Unity
** A603 (1×), A604 ($d80001 and $d90001)
* Third party
C64
The Commodore 64, also known as the C64, is an 8-bit home computer introduced in January 1982 by Commodore International (first shown at the Consumer Electronics Show, January 7–10, 1982, in Las Vegas). It has been listed in the Guinness Wo ...
expansion port
** Retro Replay ($de0x or $df2x)
** MMC64
** MMC Replay
**
IDE64 The IDE64 interface cartridge is an expansion port device for connecting ATA(PI) devices to the C64 or C128 computers.
Hardware
There were several different versions of this cartridge over the years. The interface was designed by Tomas Pribyl an ...
(address $de0x)
** Turbo Chameleon 64
External links
Clockport Expander(German)
Clockport Expander II(German)
Amiga 500 Clockport Adapter(German)
Clockport Splitter
References
{{Compu-hardware-stub
Amiga
Computer buses