Individual Computers, Germany
A2000, A3000, A4000

clock port
    USB interface
  • provides two USB ports
  • isp1763 USB host controller chip
  • compatible to USB 1.1 and 2.0 specifications
  • supports USB 2.0 highspeed mode (480 Mpbs)
  • card features clock port and proprietary X-Surf 100 expansion connectors
  • two expansion variants exist that differ with regard to the connection options and the scope of delivery:
    1. Clock Port Model
      • both connectors active
      • shipped with earthing cable, floppy power cable, plastic cover and bracket with two USB connectors
      • more expensive than the other variant as the development effort was much higher due to the idiosyncrasies of the clock port
    2. X-Surf 100 Model
      • clock port connector disabled, expansion is only usable on the X-Surf 100
      • bare board with no protective cover or USB port bracket
  • two floppy power connectors on the card to supply power to the USB ports - the second port can be used for the floppy, thus an Y cable is not needed
    • this is only needed when used on a clock port (clock port doesn't provide enough power)
    • if power hungry devices are used, it is also recommended when installed on the X-Surf
  • supplies up to 1.5 ampere per USB port
  • only supports PIO (Programmed I/O) operation (no DMA), thus having higher load on the CPU during transfers
  • typical data rates: 7.5 MB/s (Zorro III), 2.5 MB/s (Zorro II), 700 kByte/s (Clock Port)
  • when installed on the X-Surf, their external USB ports are activated - the internal ports of the RapidRoad can only be used if the respective external port stays empty
  • white status LED on board indicates proper connection
  • benefits from the faster secondary clock port on the A604n
  • power on the USB ports is only switched on upon start of USB stack, this conformes to USB specification
  • shipped with Poseidon 4.5 OEM USB stack
    • requires at least 68020 processor, 2.5MB free FastRAM, MUI, OS3.0
    • driver for e.g. USB mouse and keyboard (HID devices), mass storage, parallel interface (printers) and USB-serial bridges
  • USB_module

    Individual Computers
    documentation (english), PDF manual (english/german)