Denial

Thanks a lot for your answers. Unfortunately I can't get it right yet. I'm just trying to get this routine going. Unfortunately it doesn't work. Neither for unsigned nor signed. The routine is almost at the bottom of the page. https://llx.com/Neil/a2/mult.html INIT: LDA #SSQLO/256 STA PSLO+1 LDA #SS...

Good morning, The task is giving me a bit of a headache. :| Are my following assumptions correct? Charset @ $0200 to $02FF BitMap one @ $1000 - $17FF BitMap one @ $1800 - $1FFF Flip bit @ $9005 LDA $9005 EOR #%01000000 STA $9005 But how can I cleverly rewrite the routine for plotting? ;subroutine: p...

THX for your replies.
That saves the LDA $XXYY,x

I will try it tomorrorw.

Hello,

now i draw to "screen 2" @ $1080 - $10FF, $1180 - $11FF,... wait for the raster beam.
Then I copy the result to "screen 1" @ $1000 - $107f, 1100 - 117F,...
Clear screen 2 and so on ...

The result is okay for me.

Thanks again Mike!

How?

IRQ:
LDA $9004
BPL Return
Code for SWAP Screens
Return:
JMP $EB15

Could this work?

Hello Thegg,

you mean I should use 128 (0-127) chars for BitMap 1 and 128 (128-255) chars for BitMap 2?

Hello, I used some unsigned integer multiply routines from codebase64. Now I would like to compare some signed integer multiply rotines. But how can I print the multiplier, multiplicand and result on screen with the sign - ? As an example there is the code of my unsigned routine. ; mult39.a ; from h...

Hello, I need support to implement a double buffering routine that I would like to use in my frames per second counter / monitor program. Please see my other post. My thought on this routine is this. Main loop: 3D calculations with plotting to a memory area for example $4000-$4FFF Copy data from mem...

Here is the sample code with hidden lines... over 22FPS ??? Can this be?

There is a minor update of the code.
Now the FPS shows in decimal numbers, but only from 00-29 FPS.
I think this is enough...

Thanks a lot for the tip. I found what i need.
If i use the following code or jump to $EB15 instead the jump to $EAFB it works perfect for my routine.

Dear all, after implementing the 3DCube Demo from https://retro64.altervista.org/blog/an-introduction-to-vector-based-graphics-the-commodore-64-rotating-simple-3d-objects/ i think about a frames per second counter to know how many frames the routine is working. My routine look like this: SEI ; new I...

Hello,

The program really runs very smoothly.

Hello, For practice purposes, I programmed Mike's Madness demo in assembler. I use the following code as a random generator: randomgen_y: LDA zero ADC seed_y ADC $9128 ; or $9004 for x STA seed_y LDA seed_y cmp #192 ; #168 BCS randomgen_y INC randomgen_y+1 RTS An 8k+ expansion RAM is needed. You can...