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Old 30 January 2014, 21:03   #1
StoneOakvalley
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Turn off external drives bootblock

Hi guys,

I know there exists a bootblock tool (many actually) to disable external df1 diskdrive.....which is okey. But, is there a command to run from cli later (at any given point) that will enable it again?

I couldn't find source code for Bootblocks that turned off external drives, but my guess its just a tiny little bit set somewhere, where 1=on, 0=off. In which case the already mentioned bootblock simply set it to off.

I believe scoopex bootblock utility or nomad? has a option for turn on/off....so it has to be an easy thing...

Have You seen such a code snippet? In assembly, c, e, amos or similar?
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Old 30 January 2014, 23:31   #2
hooverphonique
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hmm... I made a bootblock that could do this (among other things) called "The Boot" back in 1990 or something... have to go and see if I can find the source for it, because I don't remember how it worked..
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Old 31 January 2014, 00:16   #3
StoneOakvalley
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Indeed, found the bootblock "The Boot v1.0" * DELIGHT * - AN OVERBOY'S CODE in the Amiga Bootblock Reader: http://eab.abime.net/showthread.php?t=39978

Now, I'm looking forward to the source if it still exists, at least the toggle drive part :-)
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Old 02 February 2014, 20:16   #4
mark_k
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There's an installer for another drive-disabling bootblock in the SuperDuper archive. (SuperDuper is an excellent system-friendly disk copier/formatter.)

The code in that bootblock calls disk.resource/AllocUnit() for drives 1-3. I'm not sure if there's any way to undo that properly after the system has booted.

Last edited by mark_k; 02 February 2014 at 20:22.
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Old 03 February 2014, 21:02   #5
hooverphonique
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Quote:
Originally Posted by StoneOakvalley View Post
Indeed, found the bootblock "The Boot v1.0" * DELIGHT * - AN OVERBOY'S CODE in the Amiga Bootblock Reader: http://eab.abime.net/showthread.php?t=39978

Now, I'm looking forward to the source if it still exists, at least the toggle drive part :-)
That's not me, I was never in Delight, but in Trash at the time..

I found the source..

Code:
 * The Boot V2.0
 * Nice boot-code by
 * Bigmama of Trash! (C) Copyright 1992

OpenFont    = -72

FindResident    = -96
DoIO        = -456
Exec_Complement    = $26
CHIP_End    = $3E
FAST_End    = $4E
ColdCapture    = $2A
CoolCapture    = $2E
AttnFlags    = $128
MemList        = $142
VBlankFreq    = $212
KickCheckSum    = $22A

TimeBeforeExit    = 30 seconds
Delay         = timebeforeexit*50
ScreenSize    = 80*160
ResidentSize    = screensize+1024+1024

Start:
        dc.l    $444F5300
        dc.l    0
        dc.l    880

        movem.l    d1-d7/a0-a5,-(SP)
        lea    start(pc),a4
        lea    $6f800,a5
        move.w    #1024/4-1,d0
Copy:        move.l    (a4)+,(a5)+
        dbf    d0,copy
        move.w    #(screensize+1024)/4-1,d0
Clear:        clr.l    (a5)+
        dbf    d0,clear

        lea    $dff004,a4
        moveq    #10,d6
        move.l    a1,(a5)

        move.l    $14(a1),a1
        move.l    $3C(a1),a1
        lea    52(a1),a1
        move.l    a1,-(sp)

GetFont:    move.l    156(a6),a6
        lea    textattr(pc),a0
        move.l    a0,(a0)
        addq.l    #8,(a0)
        jsr    -72(a6)
        move.l    d0,a0
        move.l    34(a0),a2
        move.l    4.w,a6

        lea    text(pc),a3

        moveq    #102,D2
        bsr.w    write

        moveq    #3,D0
        move.w    attnflags(a6),d4
GetCPU:        lsr.b    d4
        bcc.b    dontadd
        addq.b    #1,(chiptype-memtype)+3(a3)
DontAdd:    dbf    D0,getcpu

        move.l    memlist(a6),a0
MemLoop:    tst.l    (a0)
        beq.b    nomoreentries
        movem.l    $12(A0),D1-D2    D1: lower bound, D2: upper bound
        cmp.w    #$20,D1        test for $200000
        blo.b    nextentry
        cmp.w    #$A0,D1        test for $A00000
        bhi.b    nextentry
        sub.w    D1,D2
        add.w    D2,D3
NextEntry:    move.l    (A0),A0
        bra.b    memloop
NoMoreEntries:    swap    D3
        move.w    #$113C,D2
        bsr.w    bintoascii

        lea    memtype+4(PC),a3
        lea    chiptype(PC),A0
        move.l    #$38383100,2(A0)    * "881",0
        lsr.b    D4
        bcs.b    setupfpu
        move.l    #$4E2F4100,(A0)        * "N/A",0
SetupFPU:    and.b    #$1,D4
        add.b    D4,4(A0)
        addq.b    #"F"-"C",(showagnus-memtype)-4(A3)
        moveq    #$60,D5
        move.l    fast_end(A6),D3
        beq.b    dontonfast
        move.w    #"N ",(fastonoff-memtype)-4(A3)
        sub.l    #$C00000,D3
        moveq    #$46,D5
DontOnFast:    move.w    #$1460,D2
        bsr.b    bintoascii

        lea    memtype+4(PC),A3
        move.l    #"CHIP",(A3)
        subq.b    #"F"-"C",(showagnus-memtype)-4(A3)
        move.l    #"hips",(showagnus-memtype)-3(A3)
        move.l    #$41474100,(a0)        * "AGA",0
        btst    #1,(a4)
        bne.b    chipsaga
        move.l    #$45435300,(a0)        * "ECS",0
ChipsAGA    btst    #5,(a4)+
        bne.b    chipsecs
        move.l    #$53746400,(a0)        * "Std",0

ChipsECS    move.l    chip_end(a6),d3
        move.w    #$1780,d2
        bsr.b    bintoascii
        bra.b    checkdrives

BinToAscii:    lsr.l    D6,D3
        moveq    #125,D0
        moveq    #16,D1
        moveq    #3,D7
        lsl.w    D7,D0        calculate #1000
        lea    memsize(PC),A1
BTA_Loop:    divu    D0,D3
        add.b    #"0",D3
        move.b    D3,(A1)+
        lsr.l    D1,D3
        divu    D6,D0
        dbf    D7,bta_loop

Write:        moveq    #7,D7
        moveq    #0,D3
FetchNew:    lea    -screensize(A5),A1
        add.w    D2,A1
        move.b    (A3)+,D3
        beq.b    endwrite
        cmp.b    #31,D3
        bhi.b    charloop
        add.w    D3,D2
        bra.b    fetchnew
CharLoop:    move.b    -32(A2,D3.w),(A1)
        add.w    #192,D3
        lea    80(A1),A1
        dbf    D7,charloop
        addq.w    #1,D2
        bra.b    write
EndWrite:    rts

CheckDrives:    moveq    #2,d0
        move.w    #$1156,d4
        move.l    (sp),a0
        addq.l    #2,a3
        move.l    a3,-(sp)

        moveq    #-1,d1
CheckLoop:    tst.l    (a0)+
        bne.b    nodrive
        move.w    d4,d2
        bsr.b    write
        move.w    #"N ",(drivesonoff-fkeys)(A3)
        moveq    #0,d1
NoDrive:    move.l    (sp),a3
        addq.b    #1,2(a3)
        add.w    #800,d4
        dbf    d0,checkloop
        move.l    d1,(sp)

FKeySetup:    lea    fkeys(PC),A3
        moveq    #3,d1
        move.w    #$1dca,d4
F_Setup:    move.w    d4,d2
        add.w    #800,d4
        bsr.b    write
        dbf    D1,f_setup

        move.w    #$2fdf,D2
        bsr.b    write

        move.l    coldcapture(a6),d0
        add.l    coolcapture(a6),d0
        add.l    kickchecksum(a6),d0
        beq.b    checkntsc
        move.w    #$800,d5
        move.w    #$6f9,d2
        bsr.w    write

CheckNTSC    cmp.b    #50,vblankfreq(A6)
        beq.b    turnonscreen
        or.w    #$860,D5

TurnOnScreen:    lea    -residentsize+(copperlist-start)(a5),a1
        move.l    a1,$80-5(a4)
        move.w    #$83c0,$96-5(a4)

        bsr.b    stopdrive

Loop1:        move.w    #delay,d4
Loop2:        tst.b    (a4)
        beq.b    loop2
Rast:        tst.b    (a4)
        bne.b    rast
        move.w    d5,$180-5(a4)
        subq.w    #1,d4
        beq.b    exitboot
        lea    $bfe001,a3
        btst    d6,$16-5(a4)
        beq.w    reconfigure
        btst    #6,(a3)
        beq.b    exitboot

NotPressed:    move.b    3072(a3),d1
        cmp.b    d0,d1
        beq.b    loop2
        move.b    d1,d0
        sub.b    #$5F,d1
        beq.b    togglefast
NotF1:        addq.b    #$2,d1
        bne.b    notf2
        not.l    (sp)
        lea    drivesonoff(pc),a3
        eor.w    #$866,(a3)
        move.w    #$2104,d2
        bsr.w    write
NotF2:        addq.b    #$2,d1
        bne.b    notf3
        lea    -residentsize+(dosboot-start)(a5),a3
        bsr.b    writeboot
NotF3:        addq.b    #$2,d1
        bne.b    loop1
        lea    -residentsize(a5),a3
        bsr.b    writeboot
        bra.b    loop1

WriteBoot:    moveq    #3,d2
        moveq    #$1,d3
        lsl.l    d6,d3
        bsr.b    trackdisk
        moveq    #4,d2
        bsr.b    trackupdate
StopDrive:    moveq    #9,d2
        moveq    #0,d3

TrackDisk:    move.l    (a5),a1
        move.l    d3,36(a1)
        move.l    a3,40(a1)
        clr.l    44(a1)
TrackUpdate:    move.w    d2,28(a1)
        jsr    doio(a6)
        rts

ExitBoot:    movem.l    (sp)+,d0/a0
        or.l    d0,(a0)+
        or.l    d0,(a0)+
        or.l    d0,(a0)
        move.l    156(a6),a0
        move.l    38(a0),$80-5(a4)
        movem.l    (sp)+,d1-d7/a0-a5
        bra.w    getdoslibrary
        rts

ToggleFast:    tst.l    fast_end(A6)
        beq.b    reconfigure
        move.b    #$03,$200(A3)
        move.l    #$7FFF7FFF,D0
        move.l    D0,$9A-5(A4)
        move.w    D0,$96-5(A4)
        clr.w    $100-5(A4)
        lea    $0676.w,A6
        sub.l    A4,A4
        lea    $40000,A7
        moveq    #-1,D6
        jmp    $FC0208

ReConfigure:    clr.w    exec_complement(a6)
        move.l    #$f80002,$10.w
        illegal

        ;clr.l    4.w
        ;lea    $1000000,a0
        ;sub.l    20(a0),a0
        ;move.l    a0,$10.w
        ;illegal

Text:        dc.b    "The",1,"Boot",1,"V2.0-"
DelayString:    dc.b    "30",3,"By",1,"Bigmama/Trash",0
MemType:    dc.b    "RealFAST",2
MemSize:    dc.b    "0000",1,"KB",24
ShowAgnus:    dc.b    "CPU",1,1,":",1
ChipType:    dc.b    "68000",0
Drives:        dc.b    "DF1:",0
FKeys:        dc.b    "F1",3,"FAST",16,"O"
FastOnOff:    dc.b    "FF",0
        dc.b    "F2",3,"Drives",14,"O"
DrivesOnOff:    dc.b    "FF",0
        dc.b    "F3",3,"Write",1,"DOS-boot",0
        dc.b    "F4",3,"Write",1,34,"The",1,"Boot",34,0
        dc.b    "LMB:",1,"Exit",30,"RMB:",1,"Reset",0
        dc.b    "Possible",1,"VIRUS!",1,"RMB",1,"kills..",0
TextAttr    dc.l    0
        dc.w    8
        dc.w    0
Topaz        dc.b    "topaz.font"

CopperList:    dc.w    $00e0,$0007,$00e2,$0000
        dc.w    $0100,$9200,$0108,$0000
        dc.w    $008e,$5c81,$0090,$fcc1
        dc.w    $0092,$003c,$0094,$00d4
        dc.w    $0182,$0fff
        dc.w    $ffff,$fffe

        dcb.b    6,0

DosBoot:    dc.l    $444F5300
        dc.l    $6B9AE72B
        dc.l    880

GetDosLibrary:    lea    dosname(pc),a1
        jsr    findresident(a6)
        move.l    D0,A0
        move.l    22(A0),A0
        moveq    #$00,D0
        rts

DosName:    dc.b    "dos.library",0       * must be last address of program
End:
I don't remember how it works, but in line 43, A1 contains the IORequest and in line 46, the address stored on the stack points to 3 longs which are either 0 or $FFFFFFFF depending on, if DF1-DF3 are present or not. This value is written back in lines 254-256 (possibly inverted by pressing F2)..

I don't know the exact layout of the positive part of trackdisk.device, so I can't really tell what goes on in lines 43-46.

Note that the code can be a bit tricky to understand as a lot of stuff goes on to make it fit inside the bootblock.

The bootblock assembles with AsmOne/Trash'mOne with ucase=lcase on and ; comment off, so you can try it if you like..

Last edited by hooverphonique; 03 February 2014 at 21:43.
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Old 04 February 2014, 23:49   #6
StoneOakvalley
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Join Date: Jan 2009
Location: Norway
Age: 43
Posts: 73
Wow, thanks hooverphonique!!

In the meantime I managed to create a startup-sequence to deal with automation in WinUAE where some disks came up with a requester of "Validating error", and none of the known "kill requesters" type of programs managed to kill it. That is why I wanted to control the DF1 (turn off by boot), then turn on again by startup-sequence command at any time, so that some of the known "kill requesters" (System Request) programs *might/could* work.....

However, I managed to use ActivateWindow and fakekey programs together to let my script run along and not "pausing" WinUAE during my automation needs.

References:
http://aminet.net/package/util/cli/ActivateWindow
http://thomas-rapp.homepage.t-online.de/download.html

But, your boot source is still valuable for others and myself for possible other projects.

Nice to see sources like these surface from the beyond :-)
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