ISIZE
memset(&buf[j], 0, ISIZE);
#define NI (MAXBSIZE/ISIZE)
#define NI (MAXBSIZE/ISIZE)
(void) memset((caddr_t)&di_buf[j], 0, ISIZE);
static int isize = ISIZE;
isize += ISIZE;
(void) memcpy(iparts, bootblk.parts, ISIZE);
if (!(size % ISIZE) && !(((char *)base - (char *)0) % ISIZE))
*(int*)dst = *(int*)src, src += ISIZE, dst += ISIZE; \
*(int*) dst = *(int*) src, src += ISIZE, dst += ISIZE; \
while (i -= ISIZE)