Reply 140 of 178, by Rio444
Roman, I was wondering, what is the difference between rev1.0 and rev1.1? The only difference I could spot was the missing resistors below XS1, something to do with the program-ability of the Altera chip?
The changes are very minor, so I did not pay your attention to them.
They relate primarily to ease of assembly.
The missing resistors R1...R4 are duplicated by the resistor network RN1 on the back of the board. Soldering this resistor network takes about 2 times less time than four separate resistors.
Fixed some slightly uneven PCB conductors. Although you are unlikely to notice it.
LED VD1 is rotated 90 degrees. Due to this, LED can be tilted to the edge of the board, as is done on network cards. But I did not do it, left it as it is, because even without tilting, the LED glow is clearly visible.
The PCB track under the middle leg of the DA1 chip has been moved. Due to this, it is not necessary to delete the leg without fear of a short circuit.
The only noticeable difference is the modified Atmega firmware. Recent adapters of the previous version also have this firmware.
With new firmware If you press and hold the left mouse button before starting the adapter (before the LED lights up) and release it after turning off the LED, the state of the mouse wheel jumper is inverted. That is, the removed jumper turns on the wheel, installed - turns off. If you hold down the right mouse button in the same way, the initial state is returned. This allows you to turn the wheel on and off without opening the computer case. Unfortunately, not all mice support this feature since they have incomplete implementation of the PS/2 protocol. Usually this feature is supported by old and expensive mice.