3.5" Drive for Apple ???

From: Doug Spence <ds_spenc_at_alcor.concordia.ca>
Date: Thu May 14 05:02:27 1998

On Wed, 13 May 1998, David Williams wrote:

> Ok Sam, I have the Apple //c Technical Reference Manual with me now.
> It has a complete source code listing of the final version of the //c
> Firmware ROM. The memory map shows the //c firmware
> occupied 32K. 16K listed as "Main side ROM" and another 16K as
           ^^ ^^ ^^
> "Auxillary side ROM". Besides Applesoft and the monitor, they show
> UniDisk 3.5" routines (part of SmartPort), mouse handlers, Mouse
> BASIC routines, ACIA routines, diagnostic routines, the
> mini-assembler, extra monitor commands, firmware for all of the
> "built-in cards" and lots and lots of assembler utility routines and
> the SmartPort/Protocol Converter. It says later models had "a 256K
                                                                 ^^^
> ROM IC to replace the 128K ROM". I'd guess without further digging
                        ^^^
> that the 32K of ROM on the memory map doesn't include all of the
> code.

I'd bet that these "128K" and "256K" figures are in kiloBITS, not
kiloBYTES. So the "128K" ROM is 16KB, and the "256K" ROM is 32KB, making
all of the numbers magically work. :)


Doug Spence
ds_spenc_at_alcor.concordia.ca
Received on Thu May 14 1998 - 05:02:27 BST