CS/A65 Bus terminators
This board implements bus terminators for the CS/A bus. As has been discussed in the 6502.org forum newer technology uses stronger drivers and faster transitions between signal levels, which increase the level of jitter on the bus due to reflections. Also I am using more and more boards, and unfortunately the board design and layout was not done with reflections and bus design in mind. So I decided to implement this bus terminator board.
Table of content
Version: 1.1A
Status: untested
Notes
| This is an untested prototype, I have only added a floppy-style power supply plug and ground- and VCC-planes. |
Version: 1.0A
Status: working
Notes
| I found that when I used all resistors, my power protection mechanism pulled reset due to low voltage condition... so currently I am running with a 330/560 Ohm resistor pair on RN9/RN10 respectively. This removes the visible jitter on the screen (horizontally about one pixel, when loading a file from a floppy with the PETIO IEEE488 interface). |
