Machine language issue

[20questions]

Why is it that when I write an instruction such as LDA #$01 that it changes to jsr $2020? it does that for every single instruction. what Is going on. My only Vicmon experience is on this website:https://techtinkering.com/2013/04/16/be ... re-vic-20/
and everything there worls ok on my end but the moment I try to make something of my own, the above happens. please help.
Vicmon is set at $6000 Sys 24576

[srowe]

What address are you assembling at? If the result "changes" that suggests you're using an address that isn't RAM.

[Mike]

you're using an address that isn't RAM.

... or no memory at all.

Most probably the OP wanted to assemble the instruction at address $20xx. Read accesses from "open" address ranges quite often (but not reliably) return the high byte of the address as data. That means, even though LDA #$01 ($A9 $01) was written to $2000 and $2001, what got read back was $20 $20 $20 ... and this is disassembled (as control mechanism of the direct assembler) as JSR $2020.

Solution: Enable RAM in BLK1 ($2000..$3FFF) in VICE or add the necessary RAM expansion on real hardware.

My only Vicmon experience is on this website:https://techtinkering.com/2013/04/16/be ... re-vic-20/

There's also the thread "A sample programming session in VICMON" you have already replied to.

[20questions]

you're using an address that isn't RAM.

... or no memory at all.

Most probably the OP wanted to assemble the instruction at address $20xx. Read accesses from "open" address ranges quite often (but not reliably) return the high byte of the address as data. That means, even though LDA #$01 ($A9 $01) was written to $2000 and $2001, what got read back was $20 $20 $20 ... and this is disassembled (as control mechanism of the direct assembler) as JSR $2020.

Solution: Enable RAM in BLK1 ($2000..$3FFF) in VICE or add the necessary RAM expansion on real hardware.

My only Vicmon experience is on this website:https://techtinkering.com/2013/04/16/be ... re-vic-20/

There's also the thread "A sample programming session in VICMON" you have already replied to.

so, not enough memory? got it. thanks

[OmegaMax]

Working on your first Hello World! in assembly?

[20questions]

Working on your first Hello World! in assembly?

I've been absorbin as much as possible about the 6502, using Assembly Lines (Great book) and others. I use AppleWin when i want to do serious programming (even though I have no idea how to Use Merlin (no how to docs were released with the other stuff) nor how to exit the Editor/assembler.
I then try to replicate the code on the C64 or the Vic 20. So my day is usually full.