Linked by Thom Holwerda on Wed 3rd Apr 2013 21:45 UTC
Apple "Thanks to 35-year-old documents that have recently surfaced after three-plus decades in storage, we now know exactly how Apple navigated around that obstacle to create the company's first disk operating system. In more than a literal sense, it is also the untold story of how Apple booted up. From contracts - signed by both Wozniak and Jobs - to design specs to page after page of schematics and code, CNET had a chance to examine this document trove, housed at the DigiBarn computer museum in California's Santa Cruz Mountains, which shed important new light on those formative years at Apple."
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RE: 20K
by bhtooefr on Wed 3rd Apr 2013 23:49 UTC in reply to "20K"
bhtooefr
Member since:
2009-02-19

The original Apple II ROM set had the Monitor (I/O routines and such) in 2 kiB, with BASIC in 6 kiB.

Apple DOS takes the first three tracks of a disk (originally 13 sectors per track), for 9.75 kiB max on DOS 3.1 and 3.2. 3.3 had 16 sectors per track available, so 12 kiB max.

Edit: DOS resides from $9D00 to $C000 (plus file buffers in $9600 to $9D00). So, that's 8.75 kiB. And, it does also use the Monitor ROM for I/O, and integrates with the BASIC as a shell.

Edited 2013-04-03 23:58 UTC

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