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Workaround for y2k BIOS bugs at the only location where FreeDOS

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reads the BIOS (CMOS RTC) date (at boot). Note that according to
RBIL, DRDOS would even hook int 1a ah=4 to force a correct year.

/* A BIOS with y2k (year 2000) bug will always report year 19nn */
if ((dosregs.c.x >= 1900) && (dosregs.c.x < 1980)) dosregs.c.x += 100;


git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1359 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Eric Auer 2008-03-09 16:11:10 +00:00
parent 26f116a217
commit bfb40c4b1c
1 changed files with 2 additions and 0 deletions
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2
kernel/initclk.c
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@ -58,6 +58,8 @@ void Init_clk_driver(void)
dosregs.a.b.h = 0x2b;
dosregs.c.x = 100 * InitBcdToByte(regsD.c.b.h) /* century */
+ InitBcdToByte(regsD.c.b.l);/* year */
/* A BIOS with y2k (year 2000) bug will always report year 19nn */
if ((dosregs.c.x >= 1900) && (dosregs.c.x < 1980)) dosregs.c.x += 100;
dosregs.d.b.h = InitBcdToByte(regsD.d.b.h); /* month */
dosregs.d.b.l = InitBcdToByte(regsD.d.b.l); /* day */
init_call_intr(0x21, &dosregs);