Ninja (1986, from Mastertronic)'s method of Tandy 1000 detection

Posted on 2023-01-15, 21:49

by

by NewRisingSun

in DOSBox Development

in DOSBox Development

... is not properly emulated in DOSBox. It wants to detect a Tandy 1000 when FFFFE and FFFFF are both FF. A standard PC or PC/XT has FFFFE as FF and FFFFF as a checksum byte, which is not FF. DOSBox always sets FFFFF to 55 as a "signature". In src/ints/bios.cpp, this section: // write system BIOS …

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Re: Congo Bongo CGA Composite version

Posted on 2022-11-08, 19:58

by

by NewRisingSun

in DOS

in DOS

Unfortunately, that video used a DOS conversion. The original diskette contained two distinct executables, one for PC, one for PCjr, and the common DOS conversion only includes the PC one. So the guy in the video is running the PC version on his PCjr instead of the PCjr version. I had a look at …

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Re: Congo Bongo CGA Composite version

Posted on 2022-11-07, 17:28

by

by NewRisingSun

in DOS

in DOS

The composite color version of Congo Bongo has not been imaged. It has not even been proven that it exists. We have been trying to locate an original copy of this game for years, unsuccessfully. Edit: Your Zaxxon video lacks the presentation of running Zaxxon on a PCjr. The graphics are the same, …

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The "List of MT-32-compatible computer games" needs to be moved to the vogons wiki ASAP.

Posted on 2022-10-31, 20:26

by

by NewRisingSun

in Marvin \ Sound

in Marvin \ Sound

The Wikipedia article " List of MT-32-compatible computer games " has been nominated for deletion . The reasons include lack of "indication of why it might be notable" (doubtful) and "Seems to be entirely original research" (certainly true). I assume that the consensus will be "delete", so to …

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Re: Budokan for DOS...

Posted on 2022-01-23, 15:58

by

by NewRisingSun

in Marvin \ Software

in Marvin \ Software

There is only one non-budget version of the game. The sound card is selected via command line parameter ("adlib", "cms", "mt32", without dash or slash), or after the title screen by pressing ESC to bring up the main menu, then pressing 4 to select the music device. Sound effects will always come …

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Re: MUNT's Crash Cymbal sounding-out behavior when using MT-32 v1.07 control ROM

Posted on 2022-01-08, 22:15

by

by NewRisingSun

in MT-32 Development

in MT-32 Development

Sounds good, thank you. I checked both IN03 and CMBT-04 from Strike Commander again.

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Re: MUNT's Crash Cymbal sounding-out behavior when using MT-32 v1.07 control ROM

Posted on 2022-01-05, 08:54

by

by NewRisingSun

in MT-32 Development

in MT-32 Development

I noticed the problem now in conversions that I made in 2017, so it took me four years to notice. 😀

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MUNT's Crash Cymbal sounding-out behavior when using MT-32 v1.07 control ROM

Posted on 2022-01-04, 13:36

by

by NewRisingSun

in MT-32 Development

in MT-32 Development

I believe that the way that the Crash Cymbal rhythm instrument is sounding out when using MT-32 v1.07 control ROMs is incorrect. Rather than sounding-out gradually, it comes to an abrupt stop. To illustrate my point, I have attached: an example MIDI file that ends with the Crash Cymbal instrument …

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Re: Convert PC Booter to EXE [MULE]

Posted on 2021-09-28, 22:24

by

by NewRisingSun

in DOS

in DOS

My DOS conversion of M.U.L.E. is included in the latest (v19, August 2021) release of TDC.

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Re: Bruce Lee Booter not loading on IBM 5160

Posted on 2021-05-19, 14:32

by

by NewRisingSun

in Marvin \ Software

in Marvin \ Software

The mere fact that an XT-IDE interface is installed in the computer has in the past been found to prevent some games from working even if they are running off a floppy disk. Edit: Another reason why Bruce Lee might fail is that Datasoft copy-protected its disks with a weak bits protection scheme …

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Re: DOSBox ECE (for Windows & Linux)

Posted on 2021-05-09, 07:37

by

by NewRisingSun

in DOSBox Development

in DOSBox Development

Yesterplay80 wrote on 2021-05-05, 21:31: I commented out the two lines you mentioned before building r4452, so please give that version a try. Yes, all tracks now play correctly. Thank you.

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Re: DOSBox ECE (for Windows & Linux)

Posted on 2021-05-04, 15:57

by

by NewRisingSun

in DOSBox Development

in DOSBox Development

I would like to request the conditional removal of a sanity check. ;) In dos/cdrom_image.cpp, it says in line 393: // The maximum storage achieved on a CDROM was ~900MB or just under 100 minutes // with overburning, so use this threshold to sanity-check the start sector. else if (start > 450000) LOG …

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Re: Is this a fake Lemmings disk?

Posted on 2021-03-07, 08:44

by

by NewRisingSun

in Marvin \ Software

in Marvin \ Software

I dispute that "the real" 3.5" version supposedly wants the keydisk every time. VGALEMMI on 5.25" and 3.5" disk is the same file, so it must behave the same. It's possible that the poster had a different VGALEMMI.EXE on his 3.5" disk, possibly earlier than 1991-07-19, that was stricter in this …

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Re: Is this a fake Lemmings disk?

Posted on 2021-03-06, 20:41

by

by NewRisingSun

in Marvin \ Software

in Marvin \ Software

Use PKZIP for DOS. "PKZIP test.zip a:vgalemmi.exe" to create a zip file, then "PKZIP -v test.zip" to view the CRC.

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Re: Is this a fake Lemmings disk?

Posted on 2021-03-06, 09:43

by

by NewRisingSun

in Marvin \ Software

in Marvin \ Software

I don't know anything about copy-protection or Lemmings, but this is what I tried: When I do a fresh install of the game there is no RUSSELL.DAT file and the game insists that I insert the disk for it to start. Then if I put the disk in it will load the game and create a (hidden) RUSSELL.DAT file …

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Re: Is this a fake Lemmings disk?

Posted on 2021-03-05, 23:07

by

by NewRisingSun

in Marvin \ Software

in Marvin \ Software

Is the keydisk's copy-protected track intact? Meaning, does an unmodified copy of the game, installed to hard disk, recognize this disk as an original disk when you run the game (and no RUSSELL.DAT file is present in the hard disk's Lemmings directory)?

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Re: What causes this Basica illegal function call in Friendlyware?

Posted on 2021-02-17, 09:46

by

by NewRisingSun

in DOS

in DOS

I also notice that a common download of this game uses BASIC.EXE from Tandy DOS, which will have no sound at all on a non-Tandy computer, and which most certainly is not the originally-intended interpreter version. Using non-Tandy GWBASIC.EXE v3.23 also solves the illegal function call issue.

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Re: What causes this Basica illegal function call in Friendlyware?

Posted on 2021-02-17, 08:17

by

by NewRisingSun

in DOS

in DOS

It is a speed-related issue. I can reproduce the error when running DOSBox at the default "cycles" setting of 3000. When I set the "cycles" setting to 320 before running the game, no error is produced.

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Re: Which "old-type" Roland MT-32 to get for DOS games?

Posted on 2021-02-12, 19:36

by

by NewRisingSun

in MT-32 General

in MT-32 General

OP is asking about two versions of "old-type" MT-32 (ASSY 7937731000 vs. ASSY 793741000), not about "old-type" vs. "new-type" (ASSY 7937731001) MT-32. All that the later "old-type" MT-32 changes is to consolidate the circuit board design by changing the package type of the LA32 chip and by replacing …

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Re: Cycles settings for "RoboCop" and "Test Drive III"?

Posted on 2021-01-03, 21:01

by

by NewRisingSun

in DOSBox Games/Apps

in DOSBox Games/Apps

If you have not already done so, be sure to obtain the version 2.0 of the game Test Drive III, which allows you to select the sensitivity of the steering wheel by pressing F3. I have found that helps a lot at making the game at least somewhat enjoyable.

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