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AX = D600h
Return:
AX = 0303h (two hearts) if installed ES:DI -> buffer (see #03088)
Program: HEART.COM is a CPU lock-up/critical indicator utility by Mitch Davis.
Notes: Once the host program has identified the address of the data area, it can change this to indicate safe/critical, alternate colours, etc.. The entries for the color table are in char/attrib form. Every two entries form a pair which is alternated between 68 times a minute. The first half of the table is for color videos, the second mono. Within each half, the first half is for the safe chars, and the second for the critical chars.
Format of HEART.COM buffer: Offset Size Description (Table 03088) 00h 8 WORDs table of colors/attributes (refer to notes above) 10h BYTE flags
bit 0:
Program is in critical section, so flash double exclamation markbit 1:
Program is in safe code, so flash the heart character 11h WORD position of heartbeat on screen, normally 009Eh (last column of second line)
Category: Debuggers/Debugging Tools - Int 2Fh - H
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