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Forums > C64 Coding > load hangs on hardware
2019-04-15 13:09
oziphantom

Registered: Oct 2014
Posts: 293
load hangs on hardware

So I have a some code loading a file. it won't be there the first time but that is fine.
on VICE it works with TDE 1541 and 1571
I compress it with Exomizer to get it to work on a device and load it via EF3 Easy Transfer
It fails in the LOAD function on my 128D, it just locks up. Load never returns.
If I run the exomized version on VICE it works fine. TDE 1541 and 71

LOAD
	lda #$36
	sta $01
	lda #0
	jsr $ff90 ; setmsg off
	jsr SetUpFileName
	lda #1
	sta $d021
	LDA #$00      ; $00 means: load to memory (not verify)
   JMP $FFD5     ; call LOAD
   inc $d021
   sta $d020
	lda #$35	
	sta $01	   
	rts

SetUpFileName
	LDA #fnameEnd-fname
    LDX #<fname
    LDY #>fname
SetUpFileName2
    JSR $FFBD     ; call SETNAM
    LDA #$01
;    LDX $BA       ; last used device number
 ;   CPX #8
 ;   bcs _skip
 ;   BNE _skip
    LDX #$08      ; default to device 8
_skip   
	 LDY #1     ; not $01 means: load to address stored in file
    JSR $FFBA     ; call SETLFS
    RTS

.enc "none"
fnameReplace .text "@0:"
fname .text "ffiihs"  
fnameEnd


any ideas?
 
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2019-04-15 21:41
AlexC

Registered: Jan 2008
Posts: 262
Somehow I doubt that Vice emulation is so broken that it makes the code with JMP instead of JSR working on emulator. There must be something else in the way.
2019-04-16 08:54
Giulio/Wolf

Registered: Apr 2016
Posts: 9
Quote: Somehow I doubt that Vice emulation is so broken that it makes the code with JMP instead of JSR working on emulator. There must be something else in the way.

Exactly. Also, JMP or JSR doesn't make any difference for what he reported in his first post: his real 128D (in 64 mode? it's not specified) hangs and the drive doesn't spin when the Kernal LOAD routine is called when instead it works on VICE (X64? X128? again not specified). He also posted where exactly the load is hanging.

As I already posted, but without the necessary info is only a guess, it could be an incompatibility problem between C128 (in 64 mode?) and C64 (even if emulated on VICE). I perfectly recall the good ol' days when people with 128 were complaining on magazines that some C64 games were not working on their machines... (HE-MAN is the first game that comes in mind now...)
2019-04-16 09:28
oziphantom

Registered: Oct 2014
Posts: 293
The hang happens on
C128D with 1571 booting from an EF3 cart - so it boots to C64 mode, as it detects the EF3 cartridge
C64C (don't know the model rev) loading from SD2IEC, Taptino with and without a FC3 cart connected, in both D64(only SD2IEC) and raw PRG loading.

Tested on X64sc 3.2,3.1 TDE with 1541 and 1571
2.4,2.4OSX, C64 Debugger latest - works fine in all cases

CCS64 3.x does show a hang on loading

So its not a 128 only issue, nor a 1571 only issue.
It happens if it is direct loaded ( on methods that support it) and loaded then decompressed via Exomizer 3.0 SFX

FUN FACT : FFBA also trashes part of RAM in the FD00-FE00 block...
2019-04-16 09:30
oziphantom

Registered: Oct 2014
Posts: 293
also 02a6 is the correct 1 at time of loading, so that hasn't been trashed.
2019-04-16 10:00
tlr

Registered: Sep 2003
Posts: 1211
Quoting oziphantom
FUN FACT : FFBA also trashes part of RAM in the FD00-FE00 block...
Sounds more like the $fd15 bug? The vector setup routine trashes ram at $fd30 on a stock kernal.
2019-04-16 10:03
Flavioweb

Registered: Nov 2011
Posts: 373
Try to load it on C128, in 64 mode, pressing the "top" caps lock key (on the first row of keys)...
I recall sometimes it resolve some issues...
2019-04-16 11:36
Krill

Registered: Apr 2002
Posts: 1165
Could it be stuck in the RSPOFF loop in RSP232 (http://unusedino.de/ec64/technical/aay/c64/romf0a4.htm) due to a faulty value of ENABL = $02a1?
F0AA: AD A1 02  LDA $02A1     ; RS232 Enables
F0AD: 29 03     AND #$03
F0AF: D0 F9     BNE $F0AA

.,F0AA AD A1 02 LDA $02A1       RSPOFF LDA ENABL       ;WAIT UNTILL DONE
.,F0AD 29 03    AND #$03               AND #%00000011  ; WITH T1 & T2
.,F0AF D0 F9    BNE $F0AA              BNE RSPOFF
2019-04-17 17:38
oziphantom

Registered: Oct 2014
Posts: 293
	LDA #$FF
	STA aDD02                    ;CIA2: Data Direction Register A
	LDA #$00
	STA aDD00                    ;CIA2: Data Port Register A


If I do this before the load, it works on VICE but fails on hardware...
2019-04-17 17:53
JackAsser

Registered: Jun 2002
Posts: 1509
Quote:
	LDA #$FF
	STA aDD02                    ;CIA2: Data Direction Register A
	LDA #$00
	STA aDD00                    ;CIA2: Data Port Register A


If I do this before the load, it works on VICE but fails on hardware...


In EotB I had problems when I touched the upper bits of DD00. Never touch DD02 and always LDA, AND, OR, STA $dd00. It will be timing dependant. Try:

Lda $dd00
And #$3c
Sta $dd00
2019-04-17 21:54
Krill

Registered: Apr 2002
Posts: 1165
Yeah, changing the data direction register is a terrible idea for KERNAL load.

But the upper two bits of $dd00 (incoming DATA and CLK) can be set to anything as long as they're inputs (as is the default), so ANDing with #$fc would be no different than #$3c, #$7c or #$bc.
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