.!.
!!!!!.
. '!!!!!.
.!!!. '!!!!!.
.!!!!!!!. '!!!!!.
.!!!!!!!!!' .!!!!!!!.
'!!!!!!!' .!!!!!!!!!'
'!!!!!. '!!!!!!!'
'!!!!!. '!!!'
'!!!!!. '
'!!!!!
'!'
M A C K A P A R M E D I A
.---------------------.
----! DCPU-16 INFORMATION !-----------------------------------------------------
'---------------------'
Name: Mackapar 3.5" Floppy Drive (M35FD)
ID: 0x4fd524c5, version: 0x000b
Manufacturer: 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.
0x0003 STATE_BUSY The drive is busy either reading or writing a sector.
.-------------.
----! 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