313 lines
6.9 KiB
Plaintext
313 lines
6.9 KiB
Plaintext
;AppleWin : An Apple //e emulator for Windows
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;
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;Copyright (C) 1994-1996, Michael O'Brien
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;Copyright (C) 1999-2001, Oliver Schmidt
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;Copyright (C) 2002-2005, Tom Charlesworth
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;Copyright (C) 2006-2012, Tom Charlesworth, Michael Pohoreski
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;
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;AppleWin is free software; you can redistribute it and/or modify
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;it under the terms of the GNU General Public License as published by
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;the Free Software Foundation; either version 2 of the License, or
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;(at your option) any later version.
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;
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;AppleWin is distributed in the hope that it will be useful,
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;but WITHOUT ANY WARRANTY; without even the implied warranty of
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;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;GNU General Public License for more details.
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;
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;You should have received a copy of the GNU General Public License
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;along with AppleWin; if not, write to the Free Software
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;Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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;
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; Description: Firmware for harddisk card
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;
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; Author: Copyright (c) 2005, Robert Hoem
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;
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; Modified by Tom Charlesworth:
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; . Fixed so it can be assembled by a65 v1.06
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; . Fixed so that ProDOS entrypoint is $c70a (26 Dev 2007) (Bug #12723)
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; . Modified to support Apple Oasis' entrypoint: $c761 (8 Sept 2012) (Feature #5557)
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; . Added support for SmartPort entrypoint (20 Oct 2012)
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; - EG. "Prince of Persia (Original 3.5 floppy for IIc+).2mg"
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; TODO:
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; . Make code relocatable (so HDD controller card can go into any slot)
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; . Remove support for Entrypoint_C746 (old AppleWin) & Entrypoint_C761 (Apple Oasis)
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; - provide a utility to convert these to use Entrypoint_ProDOS
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; . Check SmartPort: Is it OK to trash Y and $42,..,$47 ?
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;
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; constants
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hd_execute = $c0f0
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hd_error = $c0f1
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hd_command = $c0f2
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hd_unitnum = $c0f3
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hd_memblock = $c0f4
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hd_diskblock = $c0f6
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hd_nextbyte = $c0f8
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command = $42
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unitnum = $43
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memblock = $44
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diskblock = $46
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slot6 = $c600
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OS = $0801
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; The Autoboot rom will call this.
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; This is also the entry point for such things as IN#7 and PR#7
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;; code
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*= $c700 ; org $c700
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start
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; Autoboot and ProDOS look at the following few opcodes to detect block devices
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; NB. $Cn07 should be $00 for a SmartPort Interface, but changing this means that it won't autoboot on ][, ][+ and unenhanced IIe.
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; . ref: http://www.1000bit.it/support/manuali/apple/technotes/udsk/tn.udsk.2.html
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lda #$20
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lda #$00
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lda #$03
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lda #$3C
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bne Bootstrap
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Entrypoint_ProDOS ; $c70a - ProDOS entrypoint
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sec
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bcs Entrypoint
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Entrypoint_SmartPort ; $c70d - SmartPort entrypoint
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clc
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Entrypoint ; $c70e - entrypoint?
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bcs cmdproc
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bcc SmartPort
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;;
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Bootstrap
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; Lets check to see if there's an image ready
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lda #$00
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sta hd_command
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; Slot 7, disk 1
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lda #$70 ; Slot# << 4
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sta hd_unitnum
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lda hd_execute
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; error capturing code. Applewin is picky
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; about code assigning data to registers and
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; memory. The safest method is via I/O port
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pha
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lda hd_error
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clc
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cmp #1
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bne noerr0
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sec
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noerr0
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pla
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bcc hdboot
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; no image ready, boot diskette image instead
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jmp slot6
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;======================================
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; TODO: Is it OK to trash Y and $42,..,$47 ?
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; Pre: C=0
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SmartPort
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pla
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sta $46
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pla
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sta $47 ; ($47) = &cmd_hdr
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pha
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lda $46
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adc #3 ; Pre: C=0, Post: assume C=0
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pha ; (sp).w += 3
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ldy #1
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lda ($46),y ; cmd
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sta $42
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iny
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bne SmartPort2
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;======================================
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; 2 unused bytes
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*= $c746 ; org $c746
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Entrypoint_C746 ; Old f/w 'cmdproc' entrypoint
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; Keep this for any DOSMaster HDD images created with old AppleWin HDD f/w.
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; DOSMaster hardcodes the entrypoint addr into its bootstrapping code:
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; - So DOSMaster images are tied to the HDD's controller's f/w
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sec
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bcs Entrypoint
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;======================================
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; Pre: Y=2
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SmartPort2
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lda ($46),y ; param_l
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sta $45
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iny
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lda ($46),y ; param_h
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sta $46
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ldy #1 ; skip paramLength (assume it's #$03)
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lda ($45),y ; unit
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sta $43
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iny
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lda ($45),y ; memblock_l
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sta $44
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iny
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bne SmartPort3
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;======================================
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; 1 unused byte
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*= $c761 ; org $c761
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Entrypoint_C761 ; Apple Oasis HDD controller entrypoint
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; Keep this for any DOSMaster HDD images created with Apple Oasis HDD f/w.
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; DOSMaster hardcodes the entrypoint addr into its bootstrapping code:
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; - So DOSMaster images are tied to the HDD's controller's f/w
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sec
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bcs Entrypoint
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;======================================
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; image ready. Lets boot from it.
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; we want to load block 1 from s7,d1 to $800 then jump there
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hdboot
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lda #$70 ; Slot# << 4
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sta unitnum
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lda #$0
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sta memblock
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sta diskblock
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sta diskblock+1
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lda #$8
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sta memblock+1
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lda #$1
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sta command
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jsr cmdproc
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bcc goload
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jmp slot6
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goload
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; X=device
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ldx #$70 ; Slot# << 4
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jmp OS
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; entry point for ProDOS' block driver
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; simple really. Copy the command from $42..$47
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; to our I/O ports then execute command
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cmdproc
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clc
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lda $42
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sta hd_command
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lda $43
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sta hd_unitnum
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lda $44
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sta hd_memblock
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lda $45
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sta hd_memblock+1
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lda $46
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sta hd_diskblock
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lda $47
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sta hd_diskblock+1
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lda hd_execute
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; check for error
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pha
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lda command
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cmp #1
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bne skipSread
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jsr sread
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skipSread
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lda hd_error
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clc
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cmp #1
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bne noerr2
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sec
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noerr2
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pla
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rts
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; if there's no error, then lets read the block into memory
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; because Applewin is picky about memory management, here's what I did:
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; on read, hd_nextbyte = buffer[0], therefore we'll read that byte 256 times (in which
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; the emulated code increments the buffer by 1 on each read) to (memblock),y
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; increment memblock+1 and read the second 256 bytes via hd_nextbyte.
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;
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; if I could figure out how to consistantly get applewin to update it's memory regions all
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; this code can be moved into the emulation code (although, this is how I'd build the hardware
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; anyway...)
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sread
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tya
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pha
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ldy #0
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loop1
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lda hd_nextbyte
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sta (memblock),y
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iny
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bne loop1
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inc memblock+1
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ldy #0
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loop2
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lda hd_nextbyte
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sta (memblock),y
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iny
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bne loop2
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dec memblock+1 ; restore memblock+1 ($45) to original value (for Epyx's California Games)
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pla
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tay
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rts
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;======================================
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SmartPort3
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lda ($45),y ; memblock_h
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pha
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iny
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lda ($45),y ; diskblock_l
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pha
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iny
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lda ($45),y ; diskblock_h
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sta $47
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pla
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sta $46
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pla
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sta $45
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iny
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bne cmdproc
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;======================================
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; 15 unused bytes
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; $CsFE = status bits (BAP p7-14)
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; 7 = medium is removable
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; 6 = device is interruptable
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; 5-4 = number of volumes (0..3 means 1..4)
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; 3 = device supports Format call
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; 2 = device can be written to
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; 1 = device can be read from (must be 1)
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; 0 = device status can be read (must be 1)
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; $C7 = Removable, Interruptable, #Volumes=1, Supports write/read/status
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; $D7 = Removable, Interruptable, #Volumes=2, Supports write/read/status
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; $BF = Removable, Interruptable, #Volumes=4, Supports format/write/read/status (KEGS / IIGS)
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; datablock. This starts near the end of the firmware (at offset $FC)
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;; data
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*= $c7fc ; org $c7fc
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.word $7fff ; how many blocks are on the device.
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.byte $D7 ; specifics about the device (number of drives, read/write/format capability, etc)
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.byte <Entrypoint_ProDOS ; entry point offset for ProDOS (must be $0a)
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.end
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