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  • Re: (16 bit) x86 Assembler lessons?

    From Bob Worm@21:1/205 to hollowone on Sunday, June 01, 2025 21:40:14
    Re: Re: (16 bit) x86 Assembler lessons?
    By: hollowone to Bob Worm on Sun Jun 01 2025 12:09:15

    Hi, hollowone.

    I assume you're doing all that in the context of MSDOS and its tools.
    I'd dig for some old books. I had fun reading Turbo Assembler 4/5 books published in the 80s/early 90s.

    Yup, that's right. I feel like an old guide would be best - they really knew how to write those things in the 80s. It seems like a lost art today.

    I could do with an INT 21h cheat sheet, man that interrupt does a lot of things!

    Thanks for checking!

    BobW
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  • From hyjinx@21:1/126 to Bob Worm on Monday, June 02, 2025 21:14:07
    Yup, that's right. I feel like an old guide would be best - they really kn how to write those things in the 80s. It seems like a lost art today.

    I could do with an INT 21h cheat sheet, man that interrupt does a lot of t

    INT21 sure did a lot of things! I second that, if anyone has an int21 cheat sheet, let us know!


    hyjinx // Alistair Ross
    Author of 'Back to the BBS' Documentary: https://bit.ly/3tRINeL (YouTube) alsgeeklab.com

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  • From mary4@21:2/150 to hyjinx on Monday, June 02, 2025 09:22:50
    Yo i am not fluent in 8086 asm i want to be. i know a little bit of it but not enough to write a program xD

    I worked on ted5 to make it work on 16 bit 286 and 8088!

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  • From hollowone@21:2/150 to Bob Worm on Monday, June 02, 2025 11:47:48

    I could do with an INT 21h cheat sheet, man that interrupt does a lot of things!

    Thanks for checking!

    Well if you care about driving this discussion forward I can tell you that I also have come back to a bit of 86 assembly these days.

    I parked one project related to MS-DOS demoscene revival to check how far i can go just booting up my own PC OS.

    Bootstrap (first 512bytes to boot up from a floppy) already works.
    Sending text and showing numbers too. I use it to welcome the user and
    show how much memory is available on the system, which CPU is supported and mark it in certain memory block before I read first sectors from a floppy to boot up for more.

    Now trying to understand conventional memory better assumed there is no OS and I have no filesystem too.. it'd be fun to invent something more creative than FAT12 as next step.

    that's my current experiment as VESA 2.0 stuff. Int 10h and Int21h and predefined PMODE extender connected to WATCOM is way to boring and "I've done that already" kind of thing :)

    -h1

    ... Xerox Alto was the thing. Anything after we use is just a mere copy.

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  • From hollowone@21:2/150 to hyjinx on Monday, June 02, 2025 11:48:59
    INT21 sure did a lot of things! I second that, if anyone has an int21 cheat sheet, let us know!

    Brown's list?

    https://www.ctyme.com/intr/int-21.htm

    -h1

    ... Xerox Alto was the thing. Anything after we use is just a mere copy.

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  • From Bob Worm@21:1/205 to hollowone on Wednesday, June 04, 2025 00:01:39
    Re: Re: (16 bit) x86 Assembler lessons?
    By: hollowone to hyjinx on Mon Jun 02 2025 11:48:59

    Hi, hollowone.

    Brown's list?

    https://www.ctyme.com/intr/int-21.htm

    That looks like a good reference, thanks.

    I was really looking for something that fits on one page - I have no idea if that is possible :\

    BobW
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