Re: Does DOSBox support TSRs?

Posted on Today, 13:30

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by ripsaw8080

in DOSBox General

in DOSBox General

@ripsaw8080: I am not sure I fully understand what you just wrote. The point is that you should call the original IRQ 0 handler before your memory dumping process, not after, but then you need some simple logic to deal with recursion. Here is an example of the handler code using your style. I have …

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Re: Does DOSBox support TSRs?

Posted on Today, 05:52

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by ripsaw8080

in DOSBox General

in DOSBox General

The most significant problem that I see is calling DOS file functions before IRQ 0 has been acknowledged. No IRQ can occur while IRQ 0 is in service because it has the highest priority. Floppy drive controllers use IRQ 6, some hard drive controllers use IRQ 15, and so trying to write to drives while …

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Re: Does DOSBox support TSRs?

Posted on 2021-06-19, 23:28

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by ripsaw8080

in DOSBox General

in DOSBox General

IMO, TSRs that react to a key press should hook the keyboard IRQ 1 handler (INT 9) because the interrupt only occurs when there is a key press or release. Using the timer IRQ 0 (INT 8) as you have is inefficient and adds unnecessary processing to the system. Since you're posting in the DOSBox …

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Re: Rescue Rover and Rescue Rover 2 do not detect soundblaster in DosBox

Posted on 2021-06-18, 09:52

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Apparently so. As I mentioned, MobyGames is not definitive -- it doesn't dissect a game to verify what is printed on the game box or what the publisher claims. Blame the misleading interface for the confusion.

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Re: Rescue Rover and Rescue Rover 2 do not detect soundblaster in DosBox

Posted on 2021-06-18, 09:29

by

by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

It appears to be a false claim of support for SB and DSS, or perhaps just a misunderstanding because the interface is misleading. The game has only simple speaker and OPL sfx, no PCM, no music. Why did they leave the music on/off tab in the interface when there's no music? I suppose because it was …

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Re: Rescue Rover and Rescue Rover 2 do not detect soundblaster in DosBox

Posted on 2021-06-18, 07:41

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Most of the early games made by the id Software guys only support PC speaker sound. I suggest checking the "Specs" tab at MobyGames as a guide for what games do or do not support, but keep in mind that it is not definitive: https://www.mobygames.com/game/dos/rescue-rover

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Re: Does anyone got working Chaos Engine, the CD version with Roland music (MT-32 or SC-55) ?

Posted on 2021-06-16, 22:50

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by ripsaw8080

in Marvin \ Software

in Marvin \ Software

If you use a BIN/CUE image then your i7 doesn't need a CD drive to run the game, because DOSBox can mount the image directly. Also, there are USB-to-MIDI adapters to use instead of a gameport (presuming you want to use a real Roland MT-32, because of course you could use MUNT instead). Anyway, good …

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Re: Does anyone got working Chaos Engine, the CD version with Roland music (MT-32 or SC-55) ?

Posted on 2021-06-16, 21:32

by

by ripsaw8080

in Marvin \ Software

in Marvin \ Software

There are some releases of the CD version that have bugs which are fixed by patches available at Patches Scrolls. One patch is for an issue with the keyboard, and another for SB. The US release I have appears to include an already-patched version of CHAOS.EXE on the disc. I am able to run the game …

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Re: Does DOSBox support TSRs?

Posted on 2021-06-16, 18:44

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by ripsaw8080

in DOSBox General

in DOSBox General

You should pay attention to which type of program binary your assembler of choice is producing (COM or EXE), and if additional things (e.g. ORG 0x100 for COM, stack location for EXE, etc.) are needed for the type produced.

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Re: Does DOSBox support TSRs?

Posted on 2021-06-16, 18:27

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by ripsaw8080

in DOSBox General

in DOSBox General

I wonder which assembler you're using, because many DOS-era assemblers recognize the NNh form of hexadecimal, but not the 0xNN form. Some general points: your use of CLI/STI in the interrupt handler is unnecessary because interrupts are always disabled when the handler is entered and IRET will …

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Re: Does DOSBox support TSRs?

Posted on 2021-06-16, 13:14

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by ripsaw8080

in DOSBox General

in DOSBox General

The end-of-interrupt (EOI) signal is acknowledging the interrupt; same thing, different term.

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Re: Does DOSBox support TSRs?

Posted on 2021-06-16, 12:31

by

by ripsaw8080

in DOSBox General

in DOSBox General

It appears you put the replacement INT 8 handler on vector C8h as well, typo in line 22. Also, your handler need not acknowledge the interrupt, as the original one will do that.

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Re: Noise in Pool of Radiance Tandy mode

Posted on 2021-06-07, 18:09

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by ripsaw8080

in DOSBox General

in DOSBox General

Probably, but not sure. It's actually writing to port C0h, but unlike the "T" sound option the result is unintelligible. For anyone with a Tandy 1000 that would try to see what happens with the "P" sound option, it might be just the first release of the game from 1988 that has the issue because …

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Re: Sarien 0.7.0 - no sound?

Posted on 2021-06-07, 13:48

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Did you install the Allegro library in your DJGPP build environment? https://www.allegro.cc/docs/dos-djgpp-compile.html In any case, README.ports lists the DJGPP port in the "in progress" section, which could mean it was not functional at the time.

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Re: Noise in Pool of Radiance Tandy mode

Posted on 2021-06-07, 05:21

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by ripsaw8080

in DOSBox General

in DOSBox General

The "P" option is for PC speaker. I guess it would have been unusual for anyone to opt for PC speaker sound on a Tandy system. It could be the game is trying to play the Tandy music through port 42h instead of port C0h, causing a strange kind of sound. 😀

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Re: Noise in Pool of Radiance Tandy mode

Posted on 2021-06-06, 20:59

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by ripsaw8080

in DOSBox General

in DOSBox General

Strange indeed, but I've seen no other reports of it and I haven't reproduced it. Have you tried LOADFIX? Maybe you have a bugged version of the game or corrupt files. There's some info regarding configuration of DOSBox and the game in this recent thread that might help: https://www.vogons.org/ …

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Re: Sarien 0.7.0 - no sound?

Posted on 2021-06-04, 08:31

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Maybe I should just try building 0.7.0 with DJGPP. I think this may be your only choice for working sound in DOS, unless you can find an existing binary. The DOS binary on SourceForge was compiled with Turbo C. According to README.ports in the 0.7.0 source files, MS-DOS builds compiled with Watcom …

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Re: Aspect ratio in SimCity for DOS

Posted on 2021-05-28, 04:36

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

OK, however just for the record, my machine type is set to svga_s3. I guessed that was the case because your screenshots with aspect=true already have the "proper 4:3 ratio" you asked for, so I'm trying to explain that for the purpose of aspect correction the aspect ratio refers to the display area …

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Re: Aspect ratio in SimCity for DOS

Posted on 2021-05-27, 20:40

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

To be more specific, there is a known issue with the aspect correction of 350-line modes when using the machine=ega setting, which includes text modes due to the 14-line font. However, I'm not aware of any compelling reason to use the EGA machine type for original SimCity. The attached screenshots …

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Re: Memory location of enviroment variables in official DOSBOX build

Posted on 2021-05-24, 13:53

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by ripsaw8080

in DOSBox Development

in DOSBox Development

I wrote 8 by mistake; 012B:0000 is the equivalent address. Each segment is a paragraph, 16 bytes, so the transform is simple. You will almost certainly not find the first shell's environment segment at the same address on other DOS systems, and it may change in later releases of DOSBox. The best …

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