Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-12, 14:17

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm just running pure DOS (PC DOS 2K) with nothing being loaded in the system files. I can't figure this one out. Any other theories on what's causing this behaviour?

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-12, 13:46

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It *seems* to be responding. But I'm not sure how to check the carry flag yet. Something unrelated but interesting. It seems EMM386 moves the EBDA to upper memory, and DOS7 IO.SYS moves the EBDA to lower memory. So, this might be why my writes to 9FC0:0000 are being invalidated. http://www. …

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-12, 10:38

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've been going over the BIOs source code, and it seems like I already took all the right steps to enable the EBDA. however, I did screw up setting the segment address of the EBDA at 0040:000E. It's actually 2 bytes long, and should be 9F C0. Here's what the procedure I'm using so far: (still not …

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-11, 10:50

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It think I found one of the keys. It's in Int 15 C207h This points the device driver to the EBDA. We also need to point int 74h to the EBDA. 8042 interrupts systems on IRQ 12. − IRQ 12 is handled by INT 74h ISR. − INT 74h ISR collects data package, storing the information in the CBIOS Extended Data …

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-11, 08:34

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I never doubted it would work with a protected mode OS. I just haven't tried because I have limited resources at the moment, and my interest is primarily DOS. I'll be ordering a new SCSI HDD shortly so that will give me a chance play around with other OSes. I think NT4 is next on the list.

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-10, 11:26

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

http://www.malinov.com/Home/sergeys-projects/sergey-s-xt This guy built a PS/2 mouse into his XT board. Maybe we can ask him what to do... This is from his BIOS source code: ;========================================================================= ; Extended BIOS data area variables …

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-10, 09:43

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I tested my adapter again on the R418 PCI board, and as I suspected something went bad. The system no longer boots with it installed. I think I made a fatal error during the installation of the socket, so I'll have to build a second one (it's easier than fixing the old one). At least now I know the …

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-10, 01:44

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I would guess that AMI probably did not move things around in the EBDA with each BIOS release. The 06/06/92 core is probably missing many of the things from the map I posted above, but the things it does have are likely in the same places (ie mouse scratch pad). Notice how the mouse stuff is the …

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Re: Help identify two late 486 boards!

Posted on 2013-12-09, 09:59

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Look at that little turd of a barrel battery. I've never seen one that small on a motherboard before. I'm surprised it's not leaking yet. I'll give you a hint about who makes your boards: Get on TH99 and look up Soyo under 486 motherboards. They should both be there.

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-09, 07:56

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is a layout for EBDA specific to AMI BIOS as found here: http://oopweb.com/Assembly/Documents/InterList/Volume/MEMORY.LST 0040:000E Format of Extended BIOS Data Area (AMI v1.00.12.AX1T): Offset Size Description (Table M0004) 00h BYTE length of XBDA in kilobytes 01h 15 BYTEs reserved 17h BYTE …

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-08, 09:21

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You need two 47pf capacitors and two 10k ohm resistors, and a 7406 IC. It's a pretty simple circuit. I recommend building on breadboard first. If you can get it going, you can try building an adapter with prototype board, machine pin legs and a 40pin DIP socket. It's a real bitch to solder though. …

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Re: Got some problems on installing software for Creative SB 1.5C soundcard..

Posted on 2013-12-08, 03:52

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just put both the printer port and the SB at IRQ7. As long as you don't use both at the same time it'll be fine.

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-07, 12:51

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think there are still some quirks in my adapter. It may be caused by lousy soldering. I am pretty busy this weekend, but when I get around to it I'm going to rebuild the circuit on breadboard and try the DTK system out again with my new weapons.

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-07, 08:59

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The IBM PS2 used the EDBA for the mouse. Int 15h seems worth looking into to me. I tried cutemouse 2.1b4 just to be safe. Still nothing.

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-07, 03:21

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here's some source code from a ROM BIOS that apparently enables the EDBA. I think we need to look into Int 15h C2h.

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-07, 00:14

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I already tried the int 11h equipment byte. No change. I tried both the Cutemouse and pc dos mouse drivers. Can you point me to the version of CTMOUSE you are using? I was pretty sure I downloaded the one that probes for hardware directly (it's an alpha version). Do you think the BIOS is perhaps not …

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-06, 11:54

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay. I managed to set the command byte to 47h with the mouse installed, but the mouse is STILL not working. I don't entirely understand HOW to program the bloody command byte because my program only works intermittently. I have had the best luck by first sending the A7h command to port 64h (disable …

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-06, 06:19

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I guess mine is "Megakey", though it just says "Version F" on it. I already confirmed it working with mouse support on an SiS 496/497 motherboard. I tried the holtek too. No change.

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-06, 02:15

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I tried loading cute mouse on my 486 EISA board after modifying the hardware byte at 0040:0010 and with the command byte set to 45. It didn't work. What is your 440BX machine doing that is so special? The kbc is very sensitive to program timings. Perhaps by putting in all those print statements …

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Re: DTK PKM-0033S +5V pin overheating + PS/2 mouse implementation

Posted on 2013-12-05, 22:39

by

by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just before I went to bed I was actually able to flip the mouse IRQ bit. (value 47)...but I didn't have the mouse plugged in. When I restarted to try again I couldn't get it working. I didn't want to plug the mouse in while the system was running incase I blew something out. After work today I can …

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