Loading files at &400

[fuzzel]

I'm trying to load a file which is &200 long at &400 from within my assembly language program using &FFF7 but it's crashing.
Is there a reason for this? I was hoping this would be a nice location to store a bit of game data.
Hopefully it is ok to do this and I've got my programming wrong somehow.

[MartinB]

That should be fine as long as BASIC is ‘off’ and not being used. Can you temporarily load the data somewhere else, say &0900-&0AFF or higher up in memory (but below screen mem) to see if it is a location problem?

[Diminished]

Conversely, you could try scribbling 0x400-0x5ff with some other data (like zeroes) and see if it still crashes.

[fuzzel]

I've spotted my error, I'd put in the following lines in my code:

.start4
EQUS"*L. MOB"
.start4a
EQUB1

but forgot to set the value of the byte at .start4a to 13 (carriage return) so got a bad string error.

Doh!

[lurkio]

.start4
EQUS"*L. MOB"
.start4a
EQUB1

but forgot to set the value of the byte at .start4a to 13 (carriage return) so got a bad string error.

Can you do this?:

Code: Select all

.start4
EQUS"*L. MOB"+CHR$13

(Genuine question. I'm not good with assembler.)

[fuzzel]

Hi Lurkio, you had me hopeful for a while but I'm afraid your suggestion results in the error "Bad expression."

[lurkio]

Hi Lurkio, you had me hopeful for a while but I'm afraid your suggestion results in the error "Bad expression."

Hmm. This works in the inline BASIC assembler:

Code: Select all

   10 FORO=0TO3STEP3
   20 P%=&3000
   30 [OPT O
   40 LDX#0
   50 .loop
   60 LDA msg,X
   70 JSR &FFE3
   80 INX
   90 CMP#13
  100 BNE loop
  110 RTS
  120 .msg EQUS "HELLO"+CHR$13
  130 ]
  140 NEXTO
  150 CALL&3000

Maybe it's not compatible with BeebAsm, if that's what you're using..?

[tricky]

Beebasm let's you do
EQUS "hello",13