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- Apple II
- Technical Notes
- _____________________________________________________________________________
- Developer Technical Support
-
-
- Apple II Miscellaneous
- #8: Pascal 1.1 Firmware Protocol ID Bytes
-
- Revised by: Matt Deatherage November 1988
- Written by: Cameron Birse December 1986
-
- This Technical Note documents the Pascal 1.1 Firmware Protocol ID bytes for
- Apple II peripheral cards and ports.
- _____________________________________________________________________________
-
-
- Background
-
- Apple II Pascal 1.1 introduced a firmware protocol called, not surprisingly,
- the Pascal 1.1 Firmware Protocol. A card following this protocol could be
- identified by the following ID bytes, where n is the slot in which the card
- resides:
-
- Address Value Definition
- $Cn05 $38 ID byte (from Pascal 1.0)
- $Cn07 $18 ID byte (from Pascal 1.0)
- $Cn0B $01 Generic signature of cards with Pascal 1.1 Protocol
- $Cn0C $ci Device signature byte
-
- $Cn0C was interpreted as two nibbles. The high-order nibble, c, was defined
- as the device signature. This signature was a pre-defined value determining
- what kind of device was connected (i.e., printer, modem, joystick, clock,
- etc.). The low-order nibble, i, was defined as a unique identifier, so you
- could tell one printer from another, for example.
-
- Developer Technical Support no longer maintains a list of assignments for the
- i nibble in this protocol. Since, by definition, the Pascal 1.1 Protocol only
- has room for 16 uniquely identified devices of each signature, it is easy to
- see that the Apple II family has outgrown the definition.
-
- Following is a table which lists the values of the Pascal 1.1 Firmware
- Protocol ID bytes for some Apple products which follow the protocol. Previous
- versions of this Note listed ID bytes for products which did not follow the
- protocol. Do not attempt to identify devices which do not follow the
- protocol by checking these ID bytes. This method will not work and should be
- avoided.
-
- For example, trying to conclusively identify a 3.5" disk drive, SCSI hard
- drive, memory expansion card, or other SmartPort device using these ID bytes
- could be disastrous. For any SmartPort device, you should look for the ProDOS
- Block Device ID bytes ($Cn01 = $20, $Cn03 = $00, $Cn05 = $03), then look for
- the additional SmartPort ID byte ($Cn07 = $00). Once you have identified
- SmartPort, you should make a SmartPort STATUS call to determine the nature and
- types of connected devices. By this definition, ProDOS block devices and
- SmartPort devices cannot follow the Pascal 1.1 Firmware Protocol.
-
-
- Pascal 1.1 Devices
-
- $Cn05 $Cn07 $Cn0B $Cn0C
- Apple II Peripheral Cards
- Super Serial Card (or port) $38 $18 $01 $31
- Apple 80 Column Card $38 $18 $01 $88
- Apple II Mouse Card $38 $18 $01 $20
-
- Apple IIc Ports
- 1st version $FBBF = $FF
- Slot 1 (Serial Port) $38 $18 $01 $31
- Slot 2 (Serial Port) $38 $18 $01 $31
- Slot 3 (80 Columns) $38 $18 $01 $88
- Slot 4 (Mouse) $38 $18 $01 $20
-
- 2nd version $FBBF = $00
- Slot 1 (Serial Port) $38 $18 $01 $31
- Slot 2 (Serial Port) $38 $18 $01 $31
- Slot 3 (80 Columns) $38 $18 $01 $88
- Slot 4 (Mouse) $38 $18 $01 $20
- Slot 7 (AppleTalk) $38 $18 $01 $31
-
- 3rd version $FBBF = $03, 4th version $FBBF = $04, and 5th version $FBBF
- = $05
- Slot 1 (Serial Port) $38 $18 $01 $31
- Slot 2 (Serial Port) $38 $18 $01 $31
- Slot 3 (80 Columns) $38 $18 $01 $88
- Slot 7 (Mouse) $38 $18 $01 $20
-
- Apple IIGS Ports (ROM 1.0 and 2.0)
- Slot 1 (Serial Port) $38 $18 $01 $31
- Slot 2 (Serial Port) $38 $18 $01 $31
- Slot 3 (80 Columns) $38 $18 $01 $88
- Slot 4 (Mouse Port) $38 $18 $01 $20
- Slot 7 (AppleTalk) $38 $18 $01 $31
-
-
- ProDOS and SmartPort Devices
-
- $Cn01 $Cn03 $Cn05 $Cn07
- Generic ProDOS Block Device $20 $00 $03 $xx
- SmartPort Device $20 $00 $03 $00
-
-