System information

Examine the CBOOT with
L900
You are now ready to replace the CBIOS by examining the area at 1F80H, where the original
version of the CBIOS resides, and then typing
ICBIOS.HEX Ready the hex file for loading.
Assume that the CBIOS is being integrated into a 20K CP/M system and thus originates at
location 4A00H. To locate the CBIOS properly in the memory image under DDT, you must
apply the negative bias n for a 20K system when loading the hex file. This is accomplished by
typing
RD580 Read the file with bias D580H.
Upon completion of the read, reexamine the area where the CBIOS has been loaded (use an
L1F80 command) to ensure that it is properly loaded. When you are satisfied that the change has
been made, return from DDT using a CTRL-C or, G0 command.
SYSGEN is used to replace the patched memory image back onto a disk (you use a test disk until
sure of the patch) as shown in the following interaction:
SYSGEN Start the SYSGEN program.
SYSGEN VERSION 2.0 Sign-on message from SYSGEN.
SOURCE DRIVE NAME Respond with a carriage return to skip the
(OR RETURN TO SKIP) CP/M read operation because the system is
already in memory.
DESTINATION DRIVE NAME Respond with B to write the new system
(OR RETURN TO REBOOT) to the disk in drive B.
DESTINATION ON B Place a scratch disk in drive B, then press
THEN TYPE RETURN RETURN.
FUNCTION COMPLETE
DESTINATION DRIVE NAME
(OR RETURN TO REBOOT)
6.3 Second-level Regeneration CP/M Operating System Manual
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