Original Apple II (not + or e or other) - test-drb@ccmp.vtda.org

22 Aug 2000

--- Eric Smith &lt;eric(a)brouhaha.com&gt; wrote:
...
  Someone asked:
  How can you tell about the original ROMs and 13
sector disk?
 I'll bet Eric Smith knows this (as well as how to properly identify a
 13-sector disk controller...one clue is that it is missing the sticker
 that has the Apple logo with a "16" inside, but that isn't a reliable
 indicator).  
 A 13-sector controller's PROMs are labelled P5 and P6, whereas a 16-sector
 controller has P5A and P6A.

 It is reasonable to upgrade a 13 sector controller to P5 with P6A.  This
 retains the 13-sector boot code, but upgrades the state machine to be
 capable of reading 16-sector format.  In my machine I had two controllers,
 one with P5 and P6A, the other with P5A and P6A.  I would boot 13-sector
 disks from the former and 16-sector from the latter, but when 16-sector
 software was running, it could use all four drives. 
Are the contents of the PROMs available anywhere for download?  I happen
to have an ancient Data I/O programmer that will blow them and a *very*
limited supply of blanks (the COMBOARD-I used a pair of 256x8 PROMs for
boot ROMs)  I wouldn't mind making a set of 13-sector PROMs.

-ethan

=====
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