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fermhg
Account closed
Registered: Oct 2002
Posts: 43 |
Down Scroll
According to Mark Greenshields in his book "Mastering Machine Code on your Commodore 64" we can do a down scroll using this routine:
LDA #$13
STA $FFD2
LDA #$11
STA $FFD2
LDA #$9D
STA $FFD2
LDA #$94
STA $FFD2
LDA #$80
STA $DA
RTS
This routine is like this in Basic:
10 PRINT "{HOME}{CRSR DOWN}{CRSR LEFT}{INST}"
20 POKE 218,128
I need to do a loop introducing, in the opportune moment some letters so that these go down according to the scroll. However I have problems to use a loop using the code machine but it works well using the Basic. Why does this happen? Can I make a down scroll down using this routine as I want? |
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Richard
Registered: Dec 2001
Posts: 621 |
Yes, I'm back after a short rest from the CSDB forum. But now a question regarding this subject.
I have learned from TMR about map scrolling background using $D016, but now, say I have done a map which is quite big like SEUCK and I want to use $D011. How would I read the map? |
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chancer
Registered: Apr 2003
Posts: 347 |
ah tmr. he's a good chap (well i would say that.hehehe) and are the rest of u coder lot. how about just moving the vertical hold on your monitor. same thing little effort ;-) |
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T.M.R
Account closed
Registered: Dec 2001
Posts: 749 |
Me...? Nah, must be confusing me with someone else. =-) |
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TDJ
Registered: Dec 2001
Posts: 1879 |
Down scroll, down!
Baaaaad scroll! |
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