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Re: I've an idea: Let's get some game development going

Posted on 2016-09-24, 23:00

in Milliways

in Milliways

Just a little point about music : I would suggest SB1.0 compatibility (OPL2/AdLib) instead of OPL3 because many clone cards don't sound as well for SB16 support as they did for SB1.0. In my knowledge SB1.0 compatibility is omnipresent, while OPL3 is less prevalent. OPL3 was introduced with Sound …

Re: I've an idea: Let's get some game development going

Posted on 2016-09-24, 22:31

in Milliways

in Milliways

OK, that sounds good to me - would you also recommend that for real mode 286? I would assume things there are pretty much identical. I've never used it for 286 code, but I assume it will be fine. Difference with 8086 isn't that big. Could you give a short crash course how to get started with …

Re: After improving UniPCemu's UART it's Serial mouse it doesn't get detected anymore?

Posted on 2016-09-24, 22:20

in PC Emulation

in PC Emulation

Usually the mouse responds with a single 'M' letter after it is reset (don't remember if RTS or DTR resets it), not several. One should be enough. T the calculation of data bits per frame is somewhat off. First of all, the stop bits calculation is weird. The stop bit selection is either 0 or 1, and …

Re: I've an idea: Let's get some game development going

Posted on 2016-09-24, 17:03

in Milliways

in Milliways

I agree that OPL2 support is a must, but I'd really like to have enhanced music for OPL3. Perhaps the songs are composed for OPL3, and then OPL2 versions made by using 9 of the most necessary instruments or something? As for graphics, I agree with your assessment. I would choose VGA, but we need a …

Re: Why was 15kHz support dropped from the VGA standard?

Posted on 2016-09-24, 16:51

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think it's most likely for cost reasons. Standard VGA resolutions used only fixed 31.5kHz horizontal rate, even if the horizontal rate can be either 60 or 70 Hz. Normally even if games did use weird video modes, they kept the horizontal rate constant or the image would roll on standard IBM …

Re: FM and PCM Volume Balance of SB Cards

Posted on 2016-09-22, 19:59

in Marvin \ Sound

in Marvin \ Sound

Just in case anyone is wondering, the OPL440 sets the channel to additive synthesis mode, so the sine wave amplitude is actually sum of two operators running at full volume. I wonder how the pan law works when playing the opl440 test tone... The YMF3812 is mono and the YMF262 is dual mono, does the …

Re: Odd mod jumper on SB32 CT3600

Posted on 2016-09-22, 19:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The brown SMT components looks like caps (rectangular, unmarked, brownish ones usually are), coupled as bypasses between signal leads and ground plane, to shunt away high frequency noise. It appears the caps on the back side are on DACK7 and DACK5, and the front cap with green wire is DACK6. Most …

Re: Fixing a Acumos AVGA2

Posted on 2016-09-22, 18:44

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

D1 is the "adjustable zener diode" TL431, more specifically, TL431CZ version of it in TO-92 package, by some manufacturer unknown to me (the stylized S letter). Because I don't know the manufacturer, it is quite impossible to know the tolerance of the part, whether it is 2%, 1% or 0.5%. Q1 is bog- …

Re: Fixing a Acumos AVGA2

Posted on 2016-09-22, 15:21

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Which one you are missing? The D1 which is a diode, or Q1, which might be a transistor, but I suspect it is a LM334 reference current generator instead.

Re: CD Audio emulation

Posted on 2016-09-22, 15:03

in PC Emulation

in PC Emulation

Well, it only needs the CD emulation driver to forward audio playing commands through some media (network, nullmodem) to another device (PC, raspberry pi) that can receive the commands and play corresponding mp3/ogg files.

Re: IBM PC AT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-22, 06:59

in PC Emulation

in PC Emulation

Because the IBM AT has a 8042 controller, which connects to a PS/2 Keyboard (and Mouse on the second port)? AT has a 8042 controller which is connected to AT keyboard and supports only keyboards. PS/2 has also a 8042 controller which supports both PS/2 keyboards and mice. PS/2 keyboards support …

Re: IBM PC AT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-21, 14:49

in PC Emulation

in PC Emulation

Btw the 8042 and PS/2 keyboard have a dual function: They support both 8042 PS/2 style and IBM XT style keyboards. The main difference is that the IBM AT automatically acnowledges the read data, while the XT disables the PS/2 mouse and requires bit 1 of port 0x61 to be raise(low-to-high transition) …

Re: Can anyone help me fix the Turbo XT BIOS on UniPCemu?

Posted on 2016-09-20, 19:08

in PC Emulation

in PC Emulation

Appears there's something wrong in the PIC emulation. I think IRQ1 keeps interrupting (or whatever the "Interrupt status: 0000000000000010" means), and it triggers the hardware interrupt handler execution. But, the vector in question is set to catch spurious interrupts. The spurious interrupt …

Re: I've an idea: Let's get some game development going

Posted on 2016-09-19, 19:30

in Milliways

in Milliways

Well 64 kilobytes gives you 512 tiles of 16*16 pixels at 4bpp. First EGA cards had only 64 kilobytes of memory, thus capable of displaying only up to 640x350 resolution at 4 colors. So only 320x200 available at 16 colors, with 2 video pages. There was a 64 kbyte add-on card, but many later cards …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-19, 18:33

in PC Emulation

in PC Emulation

You are in manufacturing test mode, because a bit in keyboard controller port said so. It toggles 0x40 in a timer interrupt. I think it's a bit near the key inhibit.

Re: Got a keyboard, but it's missing a switch??

Posted on 2016-09-18, 19:02

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Also by the looks of it, a single pole single throw switch would suffice, as the other pole is not connected anywhere. So it may be enough to just either short the two pins or let them be disconnected.

Re: I've an idea: Let's get some game development going

Posted on 2016-09-18, 18:59

in Milliways

in Milliways

So let's try to get some code whipped up, i.e. the foundation of the engine. I'm thinking real mode with the last DOS version of Borland C or Pascal, as VileR said earlier - does everyone think that's a good idea? [I will also say that FreeBasic is blazing fast in DOS, and very easy to use. I did …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-16, 21:06

in PC Emulation

in PC Emulation

Sorry my mistake; I spoke of timer2 output, but I of course meant the timer1 output. Well, 0-based or 1-based indexing... The out1 is the refresh output, it should toggle the refresh feedback data bit. The out2 is the speaker output, and it is fed back directly. No toggling.

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-16, 18:45

in PC Emulation

in PC Emulation

Edit: Whoops. Wrong BIOS(80186 running with XT BIOS)... https://www.dropbox.com/s/9u3myeohg10qqh4/debugger_20160916_1908.zip?dl=0 Uploaded it externally (since it's a bit over 5MB, 90MB unpacked even with zip file compression). And that's just before the BIOS does much (about step 20). It contains …

Re: IBM PC AT&Generic Super PC/Turbo XT BIOS hangs on UniPCemu's 286 emulation?

Posted on 2016-09-16, 15:59

in PC Emulation

in PC Emulation

Do you happen to have a log of any read/write accesses to pit2 data port 0x42 and control port 0x43?

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