5
Suggested parameters are:
•
2400 baud
•
8 bits
•
No parity
•
Two stop bits
Set S2 to TTY, press RS (reset), then hit ENTER/RETURN on your keyboard and the
KIM Clone should respond with a prompt like KIM Clone v1.0. Please reference the
KIM User Manual for what to do at this point.
Known Issues
Despite our best efforts, there are some issues you should be aware of.
Rev 3 and older boards did not have expansion capability.
Some rev 1B boards do not support single step properly. All boards shipped since
12/3/2017 have a modification done to allow single step to work properly. For
those with a rev 1B board who want to see if their board has been modified or not,
look on the bottom of the board to see if there is a .001 uf capacitor between pins 7
and 8. If the capacitor is present, then the board supports single step.
For the 6502 in single step mode, it single steps everywhere except in the monitor
EPROM, so any calls to functions in the extended monitor also single step.
While using single step, the NMI line is driven directly and is not using an open
collector. Ie, single step and an external NMI won’t work together.
Changes between Revision 2 and Revision 3 Boards
Revision 3 boards had a number of minor changes to fix know issues on Revision 2
boards. No new features or capabilities were added.
•
IC19 was removed
•
IC18 changed from 74AVC1T45 to 74LVC1T45
•
IC16 changed to 74LS00
•
IC7 and IC8 changed to 74LS145
•
R37 and R38 changed to 470 ohms
•
C18 was added
•
IC17 had power routing fixed
