Re: Looking for H/D patch for DOS 3.3

[nathan@visi.com (Nathan Mates)]

In article <dmanzer-0109961354170001@ts161.vcr.wis.net>,
Doug Manzer <dmanzer@wimsey.com> wrote:
>In article <50ctqo$nof@darla.visi.com>, nathan@visi.com 
>(Nathan Mates) wrote:
>>    Dos 3.3 disks have a fairly hard limit of 400K per disk, unless you
>> pretty much rewrite some chunks from scratch. Dos 3.3 Launcher lets
>> you mount a Dos 3.3 140K disk image on a ProDOS volume and use it that
>> way. The restrictions on using Dos 3.3 Launcher is that programs can
>> only use the lower 48K of ram; the upper 16 is reserved for ProDOS
>> (that which actually does the disk i/o)

>Thanks for the clue -- that would be enough for me, to use 
>the lower 48. However, with that arrangement would I actually be
>running DOS 3.3 or ProDos? It seems to me that all of 16k is not
>needed to access a ProDos volume, considering that it takes only
>a subroutine call to firmware on the interface card with
>a buffer address and block number as parameters. What I'd like 
>to do is run the real DOS 3.3 (patched only "slightly").

   You'd be running Dos 3.3 under ProDOS. I believe Dos 3.3 Launcher
patches out the Disk access so that _all_ i/o goes to the HD, not to
disks in the various slots.

>BTW where can I get DOS 3.3 Launcher?

   Try most major Apple II ftp sites. apple2.caltech.edu,
pub/apple2/utils/dos3.3.shk should be it. Shareware.

Nathan Mates


--
<*> Nathan Mates http://www.visi.com/~nathan/      <*>
# What are the facts? Again and again and again-- what are the _facts_?
# Shun wishful thinking, avoid opinion, care not what the neighbors
# think-- what are the facts, and to how many decimal places?  -R.A. Heinlein