USB mouse module rev.2 for Amiga 1200 (2B mainboard)
Replaces original D-sub 9 Amiga mouse port on your Amiga 1200(HD) with modern USB interface. Connect any USB HID compliant mouse to your Amiga and use it without any limitations. Optical, laser, wireless, just take your pick.
NEW in rev.2:
– Added resilience against overcurrent/overvoltage on USB port, making mouse hotplug safe
– Under-the-hood changes for increased performance and stability
– On-board mount system allowing you to fix the USB module to your rear I/O bracket, or original bottom EMI shield (minor mod needed)
This version is pinout compatible with A1200 mainboard revision 2B only. Variant for 1D4 mainboard revision is available here.
Installation in a few easy steps:
- remove chassis screws, separate top half of the chassis from bottom by lifting it up
- disconnect LED module cable from mainboard
- disconnect and remove keyboard assembly. be easy on connector!
- unplug, unscrew and remove your floppy drive (GOEX, Gotek,…)
- unscrew mainboard assembly, remove it carefully from the chassis
- unscrew all rear IO connector stand-offs, free the mainboard from bottom EMI shielding
- pull out original Amiga mouse port add-on board
- plug in Centuriontech USB module instead
- put mainboard with USB module attached back into bottom EMI shielding
- screw all rear IO connectors stand-offs back on
- secure the mainboard and USB module bard to the chassis
- return and replug keyboard, floppy drive device and LED module
- put the chassis back together, screw it back.
- connect your favorite USB mouse, fire up your A1200 and enjoy all the comfort.
NOTE: The USB mouse module is powered from CN1 port header of your Amiga mainboard through R352 resistor, which in original configuration serves as basic short circuit protection. Under the load, this resistor inevitably creates slight voltage drop on a VCC. As long as your system is powered from well performing PSU and you do not over-stress USB port, this is perfectly fine. However, in the corner cases the voltage can drop bellow minimum threshold level, which causes USB module and/or USB device to shut off. In such a case, you are advised either to replace the PSU for one with better characteristics, or replace above mentioned 4R7 resistor with 0R value. USB module itself contains its own level of short circuit protection – a resettable polymer fuse.
Amiga1200 USB board is based on unmodified SmallyMouse2 design by all great Simon Inns. All the files, schematics and FW sources can be obtained directly from https://github.com/simoninns/SmallyMouse2
|Dimensions||10 × 12 × 3 cm|
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