Re: Calculating game port theoretical max & actual bandwidth
Posted on 2014-08-20, 11:40
You can't have more than one game port adapter in the system because they all sit at the same I/O address (unless you are able to modify them).
Re: Calculating game port theoretical max & actual bandwidth
Posted on 2014-08-20, 08:23
Interesting idea. Don't over-specify things, the CPU will be using 100% of its time when it is polling the data stream from joystick port so don't make the stream too long or don't poll too often. Logitech Wingman Extreme Digital had a way to sense the reading of analog pins so it will only send out …
Re: SB16 ISA card defect. What to look for?
Posted on 2014-08-19, 14:01
Well if I were you, rather than starting to swap out components at random, I would start tracing what is causing the noise, for example with an oscilloscope. Sometimes the fault is obvious and could be seen as bad solder joint under a microscope.
Re: Calculating game port theoretical max & actual bandwidth
Posted on 2014-08-19, 08:11
Game port has eight bits and one reference says polling a port can be done in a microsecond: http://www.faqs.org/docs/Linux-mini/IO-Port-Programming.html which would make the theoretical max 976KB/s, but what's actual usage given memory access, like on the original PC/XT? Original XT clocked in at …
Dual monitor setup (color&mono) with two PCI/AGP cards?
Posted on 2014-08-13, 14:47
Just wondering if this is possible any more. In DOS. I'd like to use a dual display setup so I can for example show debug text on MDA adapter address while main VGA adapter is running a game/demo/whatever. Same thing as back in the old days where you could have MDA and VGA adapters and run Turbo …
Re: SCB-55 No sound
Posted on 2014-08-11, 06:51
Pretty sure. Here's how I came into this conclusion, do tell if I have something wrong. I did google the header pinout and first picture of SCB-55 and my quick glance of things shows the +12V/-12V pins are 18/22 and those copper traces go through filters FL5/FL3 and diodes D2/D1 to capacitors and to …
Re: SCB-55 No sound
Posted on 2014-08-10, 18:40
FL3 is most definitely filtering -12V. FL4 filters LEFT audio. FL5 for +12V. FL2 could be for RIGHT audio, but I did not check from another picture from backside of the PCB.
Re: IBM 5160 psu problems.
Posted on 2014-07-15, 23:12
First I recommend stop changing the fuses, it won't fix the problem that causes the fuse to blow and might cause more damage. The picture is bad but if you say nothing looks broken then it is something you just have to trace otherwise. Can be a bit tricky unless switching mode power supplies are …
Re: VGA to HDMI converter/scaler vs monitor's built-in scaler?
Posted on 2014-07-15, 22:30
I don't think there is no single answer. Just try different monitors and/or different separate scalers and/or different settings to get what you think is best. The bit about VGA to DVI/HDMI conversion with scaling are two completely separate things, just sometimes they exist in one chip. First there …
Re: Power Supply inside out
Posted on 2014-06-30, 20:22
I know, thats the fuse :) I think you misunderstood. I really did mean the white rectangular mains filter capacitor that says 0.22uF, which is right next to the fuse, behind the inrush current limiting thermistor. As it is not an electrolytic capacitor, it thus cannot leak goo that is identical to …
Re: Power Supply inside out
Posted on 2014-06-30, 19:01
Re: Dual sound cards
Posted on 2014-06-27, 10:09
I understand that it can be configured like so, i have an startup script to choose between AWE32 and Terratec Maestro 3296 on boot, that way evading resource conflict and having to spend ages to configure it all. But since id like to keep it simple i thought i could use two sound cards at exactly …
Re: Dual sound cards
Posted on 2014-06-26, 14:42
Even if writing to FM or joystick ports will work, both cards will respond to reading FM and joystick ports. This will instruct two output drivers to fight over the bus, and that's a bad thing. I would not suggest unless joystick and FM can be disabled or changed, manually with jumpers or through …
Re: What the crap happened to this S3M file?
Posted on 2014-06-23, 21:21
Yeah I also recall it sometimes corrupted something. Anyway, I hope you have a good hex editor. The first thing to try is to fill out the corrupted area with zeroes. Zero data byte means end of row in the file. Then hope whatever is going to play it will stop when it has read 64 rows in a pattern, …
Re: What the crap happened to this S3M file?
Posted on 2014-06-22, 22:55
I did some more research. The file is definitely corrupted, 0xE00 bytes starting from offset 0x7200 to 0x7FFF should be pattern data but looks more like sample data. Patterns 51,52 and 53 are affected and won't decode properly. Looking at the order table, the song may contain several subsongs, or …
Re: What the crap happened to this S3M file?
Posted on 2014-06-22, 09:50
Hmm, it looks like that when the song was made, unused (deleted) patterns in the middle were left out of the file, and thus there are several pattern pointers that are zero. As these are unused patterns, they are not pointed to anything (in the order table), so nothing tries to play them. It is …
Re: Project MPU (bringing MPU-401 BOBs back to life)
Posted on 2014-06-22, 06:30
Good. Now please clone the breakout box as well. If it is enough to just make it compatible with PC, it only needs to look like a register compatible UART to a PC (register map is approximately compatible with a Motorola 6850 UART). Then make a compatible breakout box with modern microcontroller …
Re: Is Syndicate supposed to be letterboxed?
Posted on 2014-06-22, 06:23
If I recall, the game runs in a 480-line mode (60Hz) and has black bars, just check screenshots. It is not a 400-line mode (70Hz), even if the game uses 400 lines for displaying video. So actual resolution is 640x480 60 Hz with 4:3 aspect ratio (so pixels are square), and game is letterboxed to have …
Re: Good or bad deal?
Posted on 2014-06-17, 11:24
At least the CT1740 has the real OPL3 chip (YMF-262). If the Gravis Ultrasound is the classic one (before ACE, MAX, PNP, etc), with 1 megabyte of DRAM, in my experience it was pretty compatible with everything. Plus whatever ISA surprise goodies you can carry.
Re: Tell your story. What made you sign up to Vogons?
Posted on 2014-06-13, 19:55
I still remember the day I joined. After been reading Vogons for some time, and concerned about OPL emulation, I wanted to rant about why OPL chip emulation was almost OK but the emulator code usually used in a way that ruins feedback and used inaccurate crystal frequency to emulate the chip. I had …
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