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- .!.
- !!!!!.
- . '!!!!!.
- .!!!. '!!!!!.
- .!!!!!!!. '!!!!!.
- .!!!!!!!!!' .!!!!!!!.
- '!!!!!!!' .!!!!!!!!!'
- '!!!!!. '!!!!!!!'
- '!!!!!. '!!!'
- '!!!!!. '
- '!!!!!
- '!'
- M A C K A P A R M E D I A
- .---------------------.
- ----! DCPU-16 INFORMATION !-----------------------------------------------------
- '---------------------'
- Name: Mackapar 3.5" Floppy Drive (M35FD)
- ID: 0x7349f615, version: 0x000b
- Manufactorer: 0x1eb37e91 (MACKAPAR)
- .-------------.
- ----! DESCRIPTION !-------------------------------------------------------------
- '-------------'
- The Mackapar 3.5" Floppy Drive is compatible with all standard 3.5" 1440 KB
- floppy disks. The floppies need to be formatted in 16 bit mode, for a total of
- 737,280 words of storage. Data is saved on 80 tracks with 18 sectors per track,
- for a total of 1440 sectors containing 512 words each.
- The M35FD works is asynchronous, and has a raw read/write speed of 30.7kw/s.
- Track seeking time is about 2.4 ms per track.
- .--------------------.
- ----! INTERRUPT BEHAVIOR !------------------------------------------------------
- '--------------------'
- A, B, C, X, Y, Z, I, J below refer to the registers on the DCPU
- A: Behavior:
- 0 Poll device. Sets B to the current state (see below) and C to the last error
- since the last device poll.
- 1 Set interrupt. Enables interrupts and sets the message to X if X is anything
- other than 0, disables interrupts if X is 0. When interrupts are enabled,
- the M35FD will trigger an interrupt on the DCPU-16 whenever the state or
- error message changes.
- 2 Read sector. Reads sector X to DCPU ram starting at Y.
- Sets B to 1 if reading is possible and has been started, anything else if it
- fails. Reading is only possible if the state is STATE_READY or
- STATE_READY_WP.
- Protects against partial reads.
- 3 Write sector. Writes sector X from DCPU ram starting at Y.
- Sets B to 1 if writing is possible and has been started, anything else if it
- fails. Writing is only possible if the state is STATE_READY.
- Protects against partial writes.
- .-------------.
- ----! STATE CODES !-------------------------------------------------------------
- '-------------'
- 0x0000 STATE_NO_MEDIA There's no floppy in the drive.
- 0x0001 STATE_READY The drive is ready to accept commands.
- 0x0002 STATE_READY_WP Same as ready, except the floppy is write protected.
- .-------------.
- ----! ERROR CODES !-------------------------------------------------------------
- '-------------'
- 0x0000 ERROR_NONE There's been no error since the last poll.
- 0x0001 ERROR_BUSY Drive is busy performing an action
- 0x0002 ERROR_NO_MEDIA Attempted to read or write with no floppy inserted.
- 0x0003 ERROR_PROTECTED Attempted to write to write protected floppy.
- 0x0004 ERROR_EJECT The floppy was removed while reading or writing.
- 0x0005 ERROR_BAD_SECTOR The requested sector is broken, the data on it is lost.
- 0xffff ERROR_BROKEN There's been some major software or hardware problem,
- try turning off and turning on the device again.
- COPYRIGHT 1987 MACKAPAR MEDIA ALL RIGHTS RESERVED DO NOT DISTRIBUTE
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