RomWBW/Source/Images/d_qpm/ReadMe.txt

===== QP/M Disk for RomWBW =====



This disk contains the distribution files for the QP/M Operating

System.  The disk is initially set up to boot CP/M 2.2.  You

must use the QINSTALL program to install QP/M on the boot

tracks and subsequently boot QP/M.



== Notes ==



By default, QP/M saves the current drive/user (2 byte value) at address 0x0008.

This is also the address of the Z80 RST 08 restart vector and conflicts with

RomWBW.  When running QINSTALL, you must change the QP/M address for this value

to something else.  I have been using 0x000E without issue.



RomWBW CBIOS has been modified to put the QP/M TIMDAT vector at 0x0010.  The

vector points into CBIOS where the actual TIMDAT routine is located.  The

TIMDAT routine reads the current date/time from HBIOS, changes the values from

BCD to binary, and rearranges some bytes for QP/M compatibilty.



--WBW 5:29 PM 6/4/2022