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Forums > C64 Coding > Drive Code C128D N0SD0S Scanner bug.

2007-05-30 15:08

6R6

Registered: Feb 2002
Posts: 244

Drive Code C128D N0SD0S Scanner bug.

Recently Nostalgia released Legacy of the Ancients.
Legacy of the Ancients +8DIR

The program used to scan the IFFL file refuse to
work on a C128D. I got this error report from someone
in USA, so I did a test on my own C128D.

What happens is:
Installer searches for the iffl file,
then it locates track+sector of the iffl file.
At this point this text is displayed on screen.

N0SD0S V1.2

SCANNING

73, CBM DOS V3.0 1571,00,00

Then scanner get installed in the 1571 drive. Scanner now
searches the IFFL file and you can hear the drive is working
as it makes a click for each track it moves to.
But then at the end of scanning everything freezes,
drive is spinning forever and the led is on.

I tried the same game disk on my c64+1541 and it
works fine. I tried not messing with the $1c07 timer.
I tried with and without fastload cartridge on my c128D.
But I get the same bug each time. Some have said i Have a bad VIC chip, but the VSP scroller in the n0s intro works fine for me.

I am not sure if its the C128D or the disk drive that is causing the problem. I wonder if anyone of you can help
me by verifying if it works or not on these setups:

1) C128D.
2) C128D but run the game from a external 1541(II) drive.
3) C128 + 1571
4) C128 + 1541(II)
5) C64 + 1571

Please post your report here.
Also, if you have any other suggestions to what
the problem might be please post here.
Thanks!

... 21 posts hidden. Click here to view all posts....

2007-06-01 17:29

6R6

Registered: Feb 2002
Posts: 244

Thanks for testing i will message you if
I need you to test something (@steppe).

I will just like to point out that my c128d works with
other games, but is having a problem with this one.

The code that is running in the disk drive looks
like this (We're running the same code for 1541
as for 1571) - I am not posting the complete
code.

Scanner is started from "scann_begin", cli
should be set at that point.

;----------- 15xx drive scanner:
sc_fileoffs = $0c ;IFFL File offset
sc_sectCnt = $0d ;IFFL Sector counter
sc_trkCnt = $0e ;IFFL Track counter
sc_trksector = $43 ;Number of sectors per track.
;FDC updates this when entering a new track.
sector_scan = $96
cmptable = $0320
sector_table = $0360
track_table = $0380

* = $0500
ldy #$1f ;clear buffer
lda #0
wed sta cmptable,y
dey
bpl wed
lda #3
sta $31 ;active buffer $0300
s41loop
jsr $f556 ;Sync
sty $30 ;Y = 0, buffer = $0300
jsr get5 ;read 5 bytes
sty $30 ;Y = 5, buffer = $0305
lda $0300
cmp #$52 ;Header block id = $52
bne s41loop ;try again
jsr $f556 ;Sync
jsr get5 ;Y = 0 read 5 bytes to $0305
ldy #0 ;buffer = $0300
sty $30
jsr $f7e8 ;convert gcr
ldx $54
stx $96
lda cmptable,x ;0 = this sector not in table
bne s41loop
dec cmptable,x ;set sector in table
ldy #5 ;gcr pointer
jsr $f7e8 ;convert gcr
ldx $96
lda $53
sta track_table,x ;store track
lda $54
sta sector_table, ;store sector
dec $43 ;Decrease # sectors for track
bne s41loop ;Complete track scanned?
...
code for checking and writing tables here..
...
lda xx
sta $0a
jmp $f418 ;Exit

get5 bvc get5 ;read 5 bytes
clv
lda $1c01
sta ($30),y
iny
cpy #5
bne get5
rts

scann_begin:
lda $024f ;allocate buffer
ora #6
sta $024f
lda #0
sta $0c
sta $0d
sta $0e
lda #$28 ;Timer hi
sta $1c07
lda $19 ;$19+$18 has T+S for file
sta $0b ;Sector
lda $18
sta $0a ;Track
more: lda #$e0 ;Exectute code at $0500->
sta $02
lda $02
bmi *-2
lda $0a
bne more
jmp $c194 ;Exit scanner
;------------- endof 15xx scanner

Now, while the drive side is scanning the iffi file
the C64/C128D side runs this code:
This routine is a waitloop, and it will
not exit until drive code has jumped $c194

lda #0
sta $90
lda Device ;zp lda $ba
jsr Rom_IECTalk
lda #$6F
jsr Rom_IECTalkSecAdr

Loop jsr Rom_IECAcPtr
bit $90
bvc Loop

jsr Rom_IECUnTalk
...

When my C128D bugs the PC is stuck inside that "Loop".
I think one thing is for sure, drive locks itself up.

GRG

2007-06-02 01:07

Ninja

Registered: Jan 2002
Posts: 407

GRG: Do you use ROM for moving the head? If not, have you tried raising the delay value for the movement?

2007-06-02 08:51

TNT
Account closed

Registered: Oct 2004
Posts: 189

ninja: he seems to be using job code $e0.

2007-06-14 01:26

6R6

Registered: Feb 2002
Posts: 244

Hello again,

Yes I'm using jobcode $e0 to move head.

Can you dump your C128D drive roms for me ?

You can use this tool I made:
Drive Memory Dump v1.0

This tool will print dos version number from
the error channel.
Please use that as filename.

Example filename:
"1541 dos v2.6"

Thanks and
Cheers!
Glenn

2007-06-14 05:16

Mace

Registered: May 2002
Posts: 1799

Okikdoki.

2007-07-02 23:44

6R6

Registered: Feb 2002
Posts: 244

( My C128D 1571 drive freaking out on Lota )

I did some more checking, and I found out that
the scanner freaks out somewhere between track 32-33.
If I exit the scanner when reaching track 32 the game
will load and run as it should.

Scanner checks the tracks in this order:
17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1
18,19,20,21,22,23,24,25,26,27,28,29,30,31,32, * freak out *

The lota game has game data in track 18.
(Not in bam t+s 18,00 and dir entry 18,01.)

lda $0a
cmp #32
bne more
jmp $c194 ;Exit scanner

badly aligned drive ? hmm..

Thanks to the ones who has sent me drive roms.
Currently I have:

3 * 1541(-II) roms (all different)
CBM 1541 64'er (73,64'er dos v3 1541,00,00)
CBM 1541 Digidos (73,digi-dos 1.0 1541,00,00)
CBM 1541 Dolphindos 2 (73,dolphindos.2 1541,00,00)
CBM 1541 Jiffydos 5 (73,jiffydos 5.0 1541,00,00)
CBM 1541 Speeddos ++ (73,speeddos ++ 1541,00,00)
CBM 1541 Speeddos 2.7 (73,speeddos 2.7 1541,00,00)
CBM 1541 Prologic System (73,Prologic Classic,00,00)
CBM 1541 Turbo Process System (73,turbo-access r2.8,00,00)
Oceanic 118 (73,cbm dos v2.6 1541,00,00)
Oceanic 118 (73,r-dos 40 tr. 1541,00,00)
3 * C128D 1571 roms (all different)
CBM 1571 (C128DCR) (73,cbm dos v3.1 1571,00,00)
CBM 1571 Jiffydos (C128D) (73,jiffydos 6.0 1571,00,00)
CBM 1581 (73,copyright cbm dos v10 1581,00,00)
CMD FD-2000 (73,cmd fd dos 1.40,00,00)
CMD FD-4000 (73,cmd fd dos 1.40,00,00)
And two versions of CMD HD v1.86 and v1.90, i havent had the time to check them.

These modified 1541 roms wont work with the current
n0sd0s identifier:
CBM 1541 Prologic System (73,Prologic Classic,00,00)
CBM 1541 Turbo Process System (73,turbo-access r2.8,00,00)

Mail me your roms if you have anything else.

Anyone have a CMD HD for sale ?
GRG

2007-07-03 06:26

Krill

Registered: Apr 2002
Posts: 2854

You're not running the thing in 2 MHz, are you?

Because in the 2 MHz mode, you must not use clv:bvc * for the byte sync but instead, poll $180f. The clv:bvc * method freezes once in a while.

But then, 2 MHz are really unnecessary for a scanner. However, they're not for loading.

2007-07-04 01:02

6R6

Registered: Feb 2002
Posts: 244

@krill: My code doesnt use the register for 2mhz mode. But thanks for the info.

2007-07-04 07:50

MagerValp

Registered: Dec 2001
Posts: 1060

I'm leaning towards bad drive alignment, where it gets bad data at track 32 and up. Have you tried modifying the scanner to send over sector checksums one sector at a time?

2007-07-04 10:42

6R6

Registered: Feb 2002
Posts: 244

A friend of mine tested on 2 different C128D's some time ago, he had no troubles...
He also said that running the game on a c128d from an external 1541,1571 and oceanic (device #9) didnt work.
Didnt even show the dos error message (73,cmd dos v2.6 1541,00,00).

A c128d is just troubles.. RR-net doesnt work on it either...

@magervalp:
I will have to try that now.

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