HP 68302 User Manual page 479

Chapter 14: Installing the Debugger
Step 3. Start the debugger
•
If you wish to build your own RS-232 cable, refer to "To connect via
RS-232" in the paragraph titled, "Step 1. Connect the HP 64000 to the
PC" earlier in this chapter.
•
When using certain RS-232 cards, connecting to an RS-232 port where
the HP 64700 is turned OFF (or not connected) will halt operation of
the PC. The only way to restore operation is to reboot the PC.
Therefore, HP recommends you always turn ON the HP 64700 before
attempting to connect via RS-232.
•
If RTC reports overrun errors or simply times out, RTC may be
overrunning the serial interface. In this case, try the following:
Stop all unnecessary TSR's and other applications to allow the processor to
service the serial interface more often.
Overrun errors may occur when the serial interface card is not sufficiently
buffered. Check to make sure your serial interface card uses the 16550AF
UART, or better. Use the DOS command, "MSD", and when the window
opens, select "COM Ports..." to see the UART chip used in your serial
interface card.
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