Make your own free website on Tripod.com
Up ] Docs Home ]

Format of SMARTDRV control block

Back ] Next ]

Offset Size Description

00h

BYTE

function code (see #01522)

---functions 00h - 03h, 06h, 07h---

no additional fields

---function 04h---

01h

BYTE

write caching control action
00h = turn off write-through
01h = turn on write-through
02h = turn off write buffering (also flushes cache)
03h = turn on write buffering (also flushes cache)

---function 05h---

01h

WORD

number of timer ticks between cache flushes

---function 08h---

01h

BYTE

new flush-on-reboot flag (00h off, 01h on)

---function 0Ah---

01h

BYTE

full-track writes are
00h = not cached
01h = cached

---functions 0Bh, 0Ch---

01h

WORD

number of 16K pages by which to increase/reduce cache size

---function 0Dh---

01h

DWORD

new address to which to chain on INT 13

Note:

the previous address is not preserved