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Author Topic: Tube 256byte (Read 4696 times)

Offline geco

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Tube 256byte
« on: 2017.April.08. 21:28:22 »
A small 256 byte Tube demo, I wanted to add vertical movement also for the tube, but i did not have enough space, better programmers I am sure could add it also. It does not run on EP64.
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« Last Edit: 2017.April.09. 18:10:50 by geco »
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Offline SlashNet

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Re: Tube 256byte
« Reply #1 on: 2017.April.09. 11:27:38 »
https://youtu.be/DRzmDa6ppik

Maybe, better create animated GIF? :)



New version: https://youtu.be/TH3xfamV-Ws
« Last Edit: 2017.April.10. 19:14:13 by SlashNet »
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Offline geco

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Re: Tube 256byte
« Reply #2 on: 2017.April.09. 11:56:31 »
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Offline geco

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Re: Tube 256byte
« Reply #3 on: 2017.April.09. 18:08:20 »
Vertical movement added, one mistake corrected, the link below contains the updated version.
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Offline Sdw

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Re: Tube 256byte
« Reply #4 on: 2017.April.25. 23:26:32 »
Nice sizecoding effect!

I looked a bit in this source (and your other 256 byte intro) and found some really neat stuff for setting up the LPT!
I guess 0xBFF4 points to an address where the system LPT can be found, and then 0x1c0 bytes into that you get the whole, X lines of lower border, sync stuff, Y lines of upper border, right?
I think I'll need to steal that for some stuff I am working on! ;)

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Offline geco

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Re: Tube 256byte
« Reply #5 on: 2017.April.26. 09:14:54 »
Quote from: Sdw on 2017.April.25. 23:26:32
Nice sizecoding effect!

I looked a bit in this source (and your other 256 byte intro) and found some really neat stuff for setting up the LPT!
I guess 0xBFF4 points to an address where the system LPT can be found, and then 0x1c0 bytes into that you get the whole, X lines of lower border, sync stuff, Y lines of upper border, right?
I think I'll need to steal that for some stuff I am working on! ;)
Please steal it ;) Yes, 0bff4h is the system LPT pointer, and added by 01c0h is the place of VSYNC part of LPT.
And yes :) lower border:
Code: [Select]
        ld      hl,(0bff4h)
        ld      bc,28*10h
        add     hl,bc
        ld      a,(hl)
        sub     4fh
        ld      (hl),a
Upper border:
Code: [Select]
        ld      a,0deh-4fh
        ld      (lptaddr+94*10h+50h),a

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