Mayne a stupid question, why do they need to survive lots of inserians ?
Because the 'present' 1088XEL board only allows for switching between PAL and NTSC modes via changing crystal X1, as well as the Antic/GTIA chips. And in my earlier tests I found some precision sockets only stayed tight on the smaller diameter crystal leads for maybe 2-3 crystal swaps. So to this end I have received and tested a sample of Digi-Key P/N: 952-2538-ND which suits the criteria I was looking for. I have updated the BOM (available at: http://ataribits.wee...m/1088xel.html) to show the use of one of these for the crystal socket and also for the SIL 6 position socket for the UAV (the other half requires a 16 pin precision IC socket). So basically one of these precision socket strips will supply two board builds.
Digi-Key P/N: 952-2538-ND
My guess is that if you really want good ones you have to pay for them. They are European and US brands like W+P, Preci-dip etc.
Yep that's why I purchased samples of different brands before settling on the one that I chose.
Michael about the Pic used on the switcher....will you explain how it works/what it does on your website ? (Gone over the entire website the last couple of days and read about everything....not only do you come up with amazing stuff, but you document it SO brilliantly....I wish other A8 suppliers would do it half as good............
Thank you for the compliment on my documentation . I do strive to do a good job on that, and appreciate it when someone notices.
The PIC chip in the Mouse Select Port board is being used to take the place of 3 main elements if it were built from discrete logic chips.
- Push button switch de-bounce signal conditioning
- A sequential counter
- Non-volatile back-up of logic state (counter position)
And what does it do? each time the push button is pressed it steps the counter through 4 possible positions, and then resets to the beginning of the sequence to repeat.
- Mouse Port Select 1 (Green LED Color)
- OFF - No Mouse
- Mouse Port Select 2 (RED LED Color)
- OFF - No Mouse
So the way this relates to the 1088XEL motherboard is that there is a built-in PS2-ST Mouse chip that has the ability to be directed to either Joystick 1 or Joystick 2, and simulates an ST Mouse being physically plugged into a joystick port. The on-board port select logic of the XEL's mouse chip is designed to work with a mechanical SPDT (Center OFF) switch. So in essence the output of the Mouse Port Select board is designed to mimic the actions of that physical switch which has 3 distinct possibilities, and due to its mechanical non-momentary nature, has memory when the system is powered off (state is restored upon power-up). The Mouse Port Select board gives us a convenient means to implement a panel mounted switch that better suits something like the Realan H80 case (takes advantage of the unused side mounted USB connector holes).
Hope that answers your questions .