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Read number of total blocks from ProDOS 8 volume directory header - and fall back on the constant 280 only for non-ProDOS 8 disks.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@4750 b7a2c559-68d2-44c3-8de9-860c34a00d81
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ol.sc
2010-07-17 19:16:25 +00:00
parent f15910e5f1
commit 07680d2376
3 changed files with 121 additions and 28 deletions
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31
doc/apple2.sgml
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@@ -433,13 +433,6 @@ BASIC.SYSTEM) there are some limitations for DOS 3.3:
</descrip><p>
<sect1>DIO<p>
Although <htmlurl url="dio.html" name="DIO"> generally works with all ProDOS 8
devices, the function <htmlurl url="dio-3.html" name="dio_query_sectcount()">
simply always return 280 (which is only correct for a 140 KB disk).
<sect1>Direct console I/O<p>
<descrip>
@@ -493,15 +486,27 @@ name="assembler manual">.
<sect1>DIO<p>
The function <htmlurl url="dio-1.html" name="dio_open()"> has the single parameter
<tt/drive_id/ to identify the drive to be opened. Therefore an Apple&nbsp;II
slot and drive pair is mapped to that <tt/drive_id/ according to the formula
<descrip>
<verb>
<tag/Drive ID/
The function <htmlurl url="dio-1.html" name="dio_open()"> has the single
parameter <tt/drive_id/ to identify the drive to be opened. Therefore an
Apple&nbsp;II slot and drive pair is mapped to that <tt/drive_id/ according
to the formula
<verb>
drive_id = slot * 16 + (drive - 1) * 128
</verb>
</verb>
so that for example slot 6 drive 2 is mapped to <tt/drive_id/ 224.
so that for example slot 6 drive 2 is mapped to <tt/drive_id/ 224.
<tag/Sector count/
The function <htmlurl url="dio-3.html" name="dio_query_sectcount()"> returns
the correct sector count for all ProDOS 8 disks. However for any non-ProDOS 8
disk it simply always return 280 (which is only correct for a 140 KB disk).
This condition is indicated by the _oserror value 82.
</descrip><p>