Path: utzoo!utgpu!water!watmath!clyde!rutgers!uwvax!oddjob!gargoyle!ihnp4!homxb!mtuxo!rayii
From: rayii@mtuxo.UUCP (XMRJ4-R.HAYES)
Newsgroups: comp.sys.ibm.pc,att.sys.pc6300
Subject: DMA BOUNDARY
Keywords: BIOS
Message-ID: <1236@mtuxo.UUCP>
Date: 30 Jan 88 16:15:31 GMT
Distribution: comp
Organization: AT&T, Middletown NJ
Lines: 21

HELP 
I am currently writing a program that uses interrupt 13h function 05h.
format track. At home i use a IBM PC/XT. After coding the proper values
for all the registers and executing the program everything works fine.
BUT when i execute the same code on pc6300 (at work) i receive an error
09h DMA BOUNDARY ERROR OCCURRED DATA DOES NOT RESIDE ON 64K BYTE DMA AREA
I assumed that the interrupt after providing the seg operator for the es
register would do the dirty work of figuring out the true 20 bit address
of the data. I also page align the data segment and start the data area
for the function at that point.
What i need to know (i think) is exactly what the dma boundarys are.
are they fixed (64k 128k etc..)
are the bios between the two machines that incompatible.
what am i doing wrong.
Please send replies email vax135!mtuxo!rayii
Thanks in advance 
RAYMOND P HAYES JR