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<TITLE>Int 21/AH=90h/CX=FFFFh
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Int 21/AH=90h/CX=FFFFh - PTS-DOS 6.51 & S/DOS 1.0 - DIRECT DISK READ -
AH = 90h
CX = FFFFh (for partitions 32 Mb)
DS:BX - request block (see #04094)
CX = sector count (for partitions 32 Mb)
DX = starting sector number
DS:BX - buffer
Return: CF set on error
AX error code
CF clear on success
Notes: This function is supported by Paragon Technology Systems S/DOS 1.0
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<h2>Int 21/AH=90h/CX=FFFFh
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<h3><font color=#C00040>PTS-DOS 6.51 & S/DOS 1.0 - DIRECT DISK READ</font></h3>
<PRE>
AH = 90h
CX = FFFFh (for partitions > 32 Mb)
DS:BX -> request block <a href="rb-3262.htm#Table4094" tppabs="http://www.ctyme.com/intr/rb-3262.htm#Table4094">(see #04094)</a>
CX = sector count (for partitions < 32 Mb)
DX = starting sector number
DS:BX -> buffer<br>
<p><b>Return:</b><br>CF set on error
AX error code
CF clear on success
</PRE>
<p><b>Notes:</b>
This function is supported by Paragon Technology Systems S/DOS 1.0
(and most probably by PTS-DOS 6.51, maybe even earlier)..
To access big partitions (> 32 Mb), the CX != FFFFh is not allowed and
the buffer must always be used. Otherwise, the system will return
error code 0207h..
It is currently unknown if this function is also supported by
PhysTechSoft PTS-DOS 6.60, 6.70, or 2000.
<p><b>See Also:</b>
<a href="rb-2584.htm" tppabs="http://www.ctyme.com/intr/rb-2584.htm">INT 21/AH=91h"PTS"</a> - INT 25h - INT 26h
<PRE>
<p>
Format of PTS-DOS & S/DOS disk read/write request block:
<a name=table4094></a>
Offset Size Description (Table 04094)
00h DWORD sector number
04h WORD counter
06h DWORD pointer to buffer
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