Re: Win16/DOSBox floppy compression issue

Posted on 2023-01-02, 16:04

by

by Harry Potter

in DOSBox General

in DOSBox General

I used to have a Win7/64 laptop at a day program with a password-protected Administrator's account and couldn't install anything on it. That problem is fixed now, but before that, I was able to get WinMount running but not fully installed. To use WinMount floppies, I had to create a batch file that …

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Re: Win16/DOSBox floppy compression issue

Posted on 2023-01-02, 15:53

by

by Harry Potter

in DOSBox General

in DOSBox General

Oh. I really want to modify a compressed floppy's contents, not just read them.

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Re: Win16/DOSBox floppy compression issue

Posted on 2023-01-02, 11:59

by

by Harry Potter

in DOSBox General

in DOSBox General

I can use zipped folders, but I have a problem: I might want to modify the zipped folder. In my experience, when I use WinMount to compress floppies, sometimes there's not enough space for the temporary update file on the floppy. :( I want to be able to modify, say, a 1MB zip file and add 10k of …

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Re: Win16/DOSBox floppy compression issue

Posted on 2023-01-01, 19:06

by

by Harry Potter

in DOSBox General

in DOSBox General

Can I compress floppy disks for Win3.1 under DOSBox or DOSBox-X? I have WinMount to do the job, but it is native to my Win11/64 laptop and, if I want to switch disks, I need to exit the emulator, unmount the floppy, mount a new floppy and then restart the emulator. It's okay for a DOS program, as I …

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Re: Win16/DOSBox floppy compression issue

Posted on 2022-12-29, 20:39

by

by Harry Potter

in DOSBox General

in DOSBox General

On my Win98SE computer at my mother's house, I use DriveSpace. It is kind of slow, especially on the drive check done before compressing a drive. On my DOS laptop there, I use JAM. It is limited but provides a good compression ratio. On my more modern computers, I use WinMount. Unfortunately, it …

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Re: Win16/DOSBox floppy compression issue

Posted on 2022-12-29, 15:17

by

by Harry Potter

in DOSBox General

in DOSBox General

I use a lot of floppies for my different computers. I like compressing things and putting them on floppies. I think it's because of what I gain by compressing them. Using floppies, especially compressed, will also help with low hard drive space issues.

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Re: Win16/DOSBox floppy compression issue

Posted on 2022-12-28, 11:07

by

by Harry Potter

in DOSBox General

in DOSBox General

I don't need floppies. I just like using them. 😀

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Re: OT: Help needed w/ optimizing lz77 compressor

Posted on 2022-12-25, 16:17

by

by Harry Potter

in Marvin \ Software

in Marvin \ Software

These files are a little dated. I attached more recent copies.

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Re: OT: Help needed w/ optimizing lz77 compressor

Posted on 2022-12-25, 16:04

by

by Harry Potter

in Marvin \ Software

in Marvin \ Software

I forgot to mention: I'm still trying to process the docs on hash tables. While I'm trying to figure them out, is there anything else I can do to optimize LZ77?

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Re: OT: Help needed w/ optimizing lz77 compressor

Posted on 2022-12-25, 16:02

by

by Harry Potter

in Marvin \ Software

in Marvin \ Software

I was trying a version of LZW, but the compression ratio was very poor. 🙁 I gained a lot of ground with it, but the ratio is still poor. I attached two code snippets of the technique:

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DOSBox-X: sound mute in background?

Posted on 2022-12-20, 17:05

by

by Harry Potter

in Marvin \ Software

in Marvin \ Software

Hi! I just ran the DOS game Boppin on the DOSBox-X to listen to its music while working, and, when I switched to another application, the sound from the game was muted. 🙁 How do I enable the sound from the emulator while it's in the background?

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Re: OT: Help needed w/ optimizing lz77 compressor

Posted on 2022-12-17, 12:27

by

by Harry Potter

in Marvin \ Software

in Marvin \ Software

My idea didn't work. 🙁 And it cost me 8k on an 8-bit system, which is significant. Worse yet, it hurt the compression ratio. 🙁

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Re: OT: Help needed w/ optimizing lz77 compressor

Posted on 2022-12-17, 12:08

by

by Harry Potter

in Marvin \ Software

in Marvin \ Software

By 'word' I do mean 16 bits, and I do scan from the most recent byte first. The last time I tried this technique, it only helped a little. I'm going to apply this now on an 8-bit version. 😀

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Re: OT: Help needed w/ optimizing lz77 compressor

Posted on 2022-12-16, 15:53

by

by Harry Potter

in Marvin \ Software

in Marvin \ Software

I'm just about ready for the optimization. Are there any other recommendations to speed up lz77 block-searching? I have a method that helps a little but needs an 8k array of bits, where each bit determines whether an associated word was already used. For every lz77 scan, I first check the array to …

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Re: Win16/DOSBox floppy compression issue

Posted on 2022-12-15, 18:39

by

by Harry Potter

in DOSBox General

in DOSBox General

If I move Win16 to DOSBox-X, can I do the disk compression? If so, how?

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Optimizations for cc65 may be useful for DOS C

Posted on 2022-12-10, 17:25

by

by Harry Potter

in Marvin \ Software

in Marvin \ Software

Hi! I have collected five lists of 10 optimizations each for cc65. Cc65 is a C compiler that targets some old 8-bit computers. However, some of the optimizations should be useful to some other C compilers, including for DOS. They are at https://sourceforge.net/projects/cc65extra/files/ . Try them …

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Win16/DOSBox floppy compression issue

Posted on 2022-12-09, 15:55

by

by Harry Potter

in DOSBox General

in DOSBox General

Hi! I have DOSBox running Windows 3.1 on two Windows laptops and use a lot of floppies for other things. I want to use floppies with my Win16/DOSBox setup. Moreover, I want the floppies to be compressed. I can compress the floppies using WinMount, but I would need to shut down and restart the WIn16 …

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Re: DOSBox Feature Request Thread

Posted on 2022-12-08, 11:42

by

by Harry Potter

in DOSBox General

in DOSBox General

You're right. Thanks! 😀

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PrintTok-002 for DOS C?

Posted on 2022-12-06, 00:22

by

by Harry Potter

in Marvin \ Software

in Marvin \ Software

Hi! I have a C module for a cross-platform C compiler called printtok-002.c. It is a way to compress strings and print out those strings. Unfortunately, it needs you to manually compress those strings, and it only helped a Commodore 64-based text adventure's text by about 25%. Should I port it to …

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Re: DOSBox Feature Request Thread

Posted on 2022-12-05, 15:48

by

by Harry Potter

in DOSBox General

in DOSBox General

I downloaded it. I need to try it out. Thank you. 😀

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