I decided to make public my work on Intel Above Board PS/PC RTC support:
So far I had lots of fun using Ghidra to disassemble original Intel driver. I did my best to format and clearly label functions and data structures and generally follow the logic along. WinMerge is a fantastic tool for spotting the differences between binary files. I left labes as lXXX, where XXX is the label address in hexadecimal.
Next, I want to:
- convert repetitive code blocks into macros;
- consider optimizing out inefficiencies to shave some bytes from the 1280 bytes that Intel driver occupies in base memory;
- consider converting to NASM/YASM or JWASM, so driver can be built without DosBox and MASM 5.1;
- develop stand-alone getclock/setclock DOS programs to keep the time accurate without the use of driver.