Apple Logic Board Informations techniques Page 72
- Page / 77
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
II. CONTROLLING THE SATURN 64K and 128K RAM BOARD
The Saturn 64K and 128K boards are controlled using 16
locations in the range $CONO — $CONF, where N = 8 + Saturn board
slot #. Thus for slot zero operation, the control addresses are
in the range $C080 to $C08F. These locations are in the Apple’s
peripheral I/O space as described in Apple II reference manual,
p. 80. They are used by the Saturn 64K and 128K boards to control
the following functions:
1. Select the Saturn RAM board or the Apple main board
ROM.
2. Select the desired 16K bank to access.
3. Determine which 4K bank (A or B) within each 16K bank is
to be used.
4. Write enable or write protect RAM.
In order to set the Saturn 64K or 128K board in a given
state, a memory access to the particular location corresponding
to the desired state is all that is required. This can be accom-
plished by either reading or writing to the location. From
BASIC, a POKE or PEEK will accomplish this memory access. A
machine language load or store will also serve the same purpose.
The lower 4 bits of the control address selects the mode of
operation of the Saturn 64K and 128K boards, as well as
determines which 16K bank is to be accessed.
A. When address line 2 is low (A2=0) state selection is enabled.
In this case address lines 0, 1 and 3 determine the state which
is set as follows.
1. Address line 0 determines whether the board will be write
enabled or write protected. (AO = 0 for write protect; AO = 1 for
write enable)
2. Address lines 0 and 1 are used to determine whether the
main board ROMs are accessed, or the RAM on the Saturn board.
3. Address line 3 determines which 4K bank within the
selected 16K bank to use. (A3 = 0 for 4K bank A; A3 = 1 for 4K
bank B)
B. On the other hand when address line 2 is high (A2=l) 16K Bank
selection is enabled. The address lines 0, 1 and 3 determine
which 16K bank is selected.
70
- 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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