Apple Logic Board Información técnica Pagina 15
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Chapter 4
MOVEDOS DOS RELOCATION SOFTWARE
The software provided with the Saturn 64K and 128K boards
enables one to take advantage of a portion of the RAM present on
these cards by moving DOS (DOS 3.2 or 3.3) up into the board,
thus freeing up approximately 10K of memory for user programs.
In a 48K system, DOS normally resides at the top of the
48K of RAM, occupying 10.5K of RAM (from $9~00 to $BFFF). HIMEM
is set to reflect the presence of DOS (HIMEM = $9600). As long
as DOS is resident, the memory occupied by it is not available
for program use. The program MOVEDOS, provided with the Saturn
64K and 128K boards, frees up 10K of the memory space normally
occupied by DOS, while at the same time keeping DOS in the
system, and available. This is accomplished by relocating
(moving) DOS up into the Saturn RAM board and making appropriate
modifications to the system so as to be able to communicate with
this relocated DOS. DOS is kept in the 64K or 128K memory board,
and used when required.
Essentially DOS is stored in a portion of the Saturn 64K or
128K board which is disabled (turned off) until it is needed.
As a result, when DOS is not being used, it isn’t sitting in
lower memory, taking up valuable space. When DOS is required, it
is used in the following manner.
1. The part of the Saturn 64K or 128K board which contains
DOS is enabled (turned on). This results in BASIC (Integer
or Applesoft) being disabled (turned off) and no longer
resident.* This poses no problem, since BASIC is not
required by DOS during the time a DOS command is being
executed.
2. The desired DOS command is executed by the relocated
DOS, now resident in the system.
3. The portion of the Saturn RAM board which contains DOS
is disabled (turned off) . The BASIC which had been
present prior to the call to DOS is re—enabled, and
control is returned to the program from which DOS was
called.
In this way, as far as the user is concerned, DOS is present
in the system and there is 10K more memory available for program
use. In addition, the user has access to either BASIC (Integer
or Applesoft), since either of these can be present in the Saturn
------------------------------------------------------------------
* Note: This occurs because the relocated DOS actually shares
the memory space occupied by BASIC. ($DOOO—$FFFF)
13
- TABLE OF CONTENTS 3
- REGISTRATION CARD: 6
- SERVICE: 6
- Chapter 1 7
- INTRODUCTION 7
- Chapter 2 8
- INSTALLATION INSTRUCTIONS 8
- I. RECOMMENDED LOCATION 8
- II. INSTALLATION 8
- Chapter 3 10
- IV. OVERVIEW OF SOFTWARE 13
- Chapter 4 15
- USING MOVEDOS 16
- TECHNICAL INFORMATION 20
- (only 1st two banks shown) 22
- RAM BOARD 22
- Chapter 5 26
- RAMEXPAND 26
- USE OF RAMEXPAND 30
- PRECAUTIONS 35
- CURRENT LIMITATIONS 37
- EXAMPLE PROGRAM 37
- Chapter 6 48
- DOS PSEUDO—DISK 48
- SETTING UP THE PSEUDO DISK 49
- INSTALLING THE PSEUDO DISK 50
- USING THE PSEUDO DISK 52
- HOW IT WORKS 52
- “ files from any drive to 54
- (configuration) 56
- , by typing “F”. When the 57
- V. USING FASTCOPY 58
- USING FILEMOVER: 62
- # of the first memory card 67
- III. USING THE PSEUDO DISK 69
- LIMITATIONS AND REQUIREMENTS 69
- — $FFFF, for DOS, monitor 74
- SPECIFICATIONS 76
- A. Memory 76
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