Re: SB16 CT2230 makes my 486 freeze in Doom

Posted on 2021-02-18, 19:39

by

by jbenam

in Marvin \ Sound

in Marvin \ Sound

So, after socketing half of my SB16, it seems like the culprit lies in the mixer chip. I've put the CT1745-S from my other SB16 (a later, cost reduced edition) and I haven't seen a crash yet. Weird. Maybe my CT1745A was some weird revision with a bug not fixed yet? I also need to reinstall the …

---

Re: SB16 CT2230 makes my 486 freeze in Doom

Posted on 2021-02-15, 22:21

by

by jbenam

in Marvin \ Sound

in Marvin \ Sound

I would inspect the DSP and double check the jumpers in that case. All parts in place around the DSP? https://www.vogons.org/download/file.php?id=27397&mode=view The jumpers are okay and I can't see any part out of place - reflowing didn't help. It was a very crude reflowing since I am without a …

---

Re: SB16 CT2230 makes my 486 freeze in Doom

Posted on 2021-02-15, 10:55

by

by jbenam

in Marvin \ Sound

in Marvin \ Sound

Rawit wrote on 2021-02-15, 10:10: How does it behave in other games? In Duke 3D the sound effects stop suddenly, but the game does not freeze. Prince 2 freezes like Doom.

---

Re: SB16 CT2230 makes my 486 freeze in Doom

Posted on 2021-02-15, 09:27

by

by jbenam

in Marvin \ Sound

in Marvin \ Sound

Hi! Found this one, watch the last post. Hope it would be helpful. https://www.amibay.com/showthread.php?54938-Sb16-ct2230 Hi, Thanks for your post! Sadly it's not the kind of issue I am facing. The card is correctly seen by the system and I can hear sounds, the issue is that it freezes like there …

---

Re: SB16 CT2230 and Windows 3.11 Incorrect MIDIPORT in System.ini

Posted on 2021-02-13, 22:08

by

by jbenam

in Marvin \ Sound

in Marvin \ Sound

The drivers are installed at the same time. The card itself works perfectly fine in DOS, just in Windows there is no sound and that erro message. I do get that message in Windows if the card is not in the PC (well duh) or if I have forgot to uncomment some of the autoexec.bat/config.sys init lines. …

---

SB16 CT2230 makes my 486 freeze in Doom

Posted on 2021-02-13, 22:03

by

by jbenam

in Marvin \ Sound

in Marvin \ Sound

Hi everyone, I am having the following issue with my CT2230: random freezes when playing Doom with Sound Effects enabled. It does not happen if it's just music that it's enabled. It's not a driver issue since I have also tried with Unisound and I get the same issue. I do have another SB16, a CT2950, …

---

Re: SB16 CT2230 and Windows 3.11 Incorrect MIDIPORT in System.ini

Posted on 2021-02-13, 21:55

by

by jbenam

in Marvin \ Sound

in Marvin \ Sound

Hi, My CT2230 did not have this issue after it was installed under Win3.11 WFW. AFAIR, I did install the DOS drivers before I did the Win3.1 setup, which might have helped. The CT2230 needs to be initialised using various stuff in autoexec.bat and config.sys, which I am not sure if it's done by the …

---

Unknown Multi I/O VLB Card (Hornet Technology?) VL-300 with SCSI

Posted on 2020-12-16, 17:35

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi everyone, I have bought this card some months ago for cheap and I can't find ANYTHING about it on the interwebz, except that it was somewhat popular as it was extremely low price back then. There are drivers for it on a French website (thanks!) but they aren't helping me much with the little …

---

Re: Undocumented jumpers for GMB-486SG / DTK PKM-0038S? Writeback working rarely

Posted on 2020-12-15, 13:17

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm very interested by this topic :) I have sold my motherboard to someone, but maybe you can help us improve this page with these infos ? http://www.win3x.org/uh19/motherboard/show/2600 I don't think I will be able to provide much more than what is provided in the initial post - they are also …

---

Re: Undocumented jumpers for GMB-486SG / DTK PKM-0038S? Writeback working rarely

Posted on 2020-12-13, 15:06

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

One detail from my other thread that may be of interest: at least on my ASUS board, setting the jumper that connects the CACHE# line of the CPU to pin 118 of the chipset causes it to hang when booting if using L1 WB. According to the chipset datasheet, pin 118 is supposed to work as CACHE# line …

---

Re: Undocumented jumpers for GMB-486SG / DTK PKM-0038S? Writeback working rarely

Posted on 2020-12-12, 23:06

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Anyway, I suspect it might be an issue with my specific motherboard. I fear some of the required connections might have stopped working (solder joints cracking?). Not even by using ctchip34 (which is amazing, by the way!) have I managed to get it working again in WB mode. Also, since it hangs when …

---

Re: Undocumented jumpers for GMB-486SG / DTK PKM-0038S? Writeback working rarely

Posted on 2020-12-11, 10:28

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, I gave up on trying to enable L1 WB for a DX4 CPU on my Gigabyte GA-486VS, despite confirming all the required connections. The L1 WB works fine for DX2 CPU with write-back support, but with the DX4 setting the WB/WT# jumper results in a black screen. So it seems that CPU requires something …

---

Re: Undocumented jumpers for GMB-486SG / DTK PKM-0038S? Writeback working rarely

Posted on 2020-12-10, 23:17

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A while back I posted this guide with details on how the jumpers work for setting L1 WB, clock multiplier, voltage detection and other things an ASUS motherboard with the SiS471 chipset. My main references were the SiS471 datasheet (which I assume you already have) and a really comprehensive page …

---

Undocumented jumpers for GMB-486SG / DTK PKM-0038S? Writeback working rarely

Posted on 2020-12-08, 18:59

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi everyone, I've got a GMB-486SG which is very dear to me - and I've put an Am5x86 X5 P75 on it. I've got the last revision of the board (v2.2, according to the sticker onboard) and the latest available BIOS around, which it seems is 01/10/95. I'm not sure what is going wrong, but I have been able …

---

Re: Issues on XT clone mainboard with Landmark diagnostic (Interrupt level 0 and Keyboard Controller)

Posted on 2020-03-07, 19:22

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So, I painfully discovered that the "good" board is plagued by cold joints everywhere, along with micro cracks in the soldering. While reflowing the LS322 socket, I noticed the clock signal wasn't passing along - since it passes in one of the internal layers, I have reason to believe that the board …

---

Re: Issues on XT clone mainboard with Landmark diagnostic (Interrupt level 0 and Keyboard Controller)

Posted on 2020-03-05, 22:17

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So, the "good" board stopped booting altogether after swapping the chips around with the other, non-booting, board. While testing, a cap blew up on that one so I shelved it and replaced the chips on the "good" board only to find that it didn't work anymore. I since bought a Logic Probe (until I can …

---

Re: Issues on XT clone mainboard with Landmark diagnostic (Interrupt level 0 and Keyboard Controller)

Posted on 2020-03-03, 08:55

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Check and maybe replace the LS125 that's connected to the keyboard lines? But I wouldn't bet my money on this one. Swapped it with another LS125 to no avail. Maybe the testing program is not detecting the fault correctly - but it seems to have something to do with interrupts. How are you booting …

---

Re: Issues on XT clone mainboard with Landmark diagnostic (Interrupt level 0 and Keyboard Controller)

Posted on 2020-03-02, 22:03

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On XT the reset signal comes from 8284 clock generator - but that only goes to CPU/NPU, 8237 DMA, and 8255 PIO. Also, one of the LS04 chips which creates a negated RESET_DRV signal for ISA slots and keyboard connector. The _DRV is also used by some address decoding logic, and the 8253 timer chip. …

---

Re: Issues on XT clone mainboard with Landmark diagnostic (Interrupt level 0 and Keyboard Controller)

Posted on 2020-03-02, 13:26

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'd start with figuring out what went wrong with your keyboard adapter build. Might tell you where to look for damage, before you spend your money on replacing each and every chip on the mobo. Also, prevent you from killing any more mobos. If you somehow connected +5V to the reset line, that …

---

Issues on XT clone mainboard with Landmark diagnostic (Interrupt level 0 and Keyboard Controller)

Posted on 2020-03-02, 09:35

by

by jbenam

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi everyone, I'm trying to restore my unknown generic XT board to full functionality after a botched attempt to build a AT2XT. I'm not sure what went wrong with it, but it killed my other mainboard (PIM-640) and it left this one limping. Some magic smoke came out from the PIM-640 (couldn't pinpoint …

---