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Re: M396F motherboard

Posted on 2018-02-13, 03:30

Sorry to bump this thread, but I managed to score one of these from the recycler with a Cyrix Cx486SLC/2-50 processor onboard. Amazingly, even though it fell off a forklift onto the ground, it still boots and runs. With the turbo on, it feels rather nice for having no L2 cache, definitely like what …

Re: Sound Blaster 16 Bugs and Deficiencies Summary

Posted on 2018-01-17, 22:40

As for the CT28xx vibra distortion, I wonder if that's possibly due to Creative using much too low impedance resistors on the mixer inputs and outputs? I had a CT2900 that had very loud, crackly PCM output, but after replacing the original resistors in question (discovered by probing with a …

Re: I de-CQMed my AWE32 PnP CT3990...!

Posted on 2018-01-03, 18:08

Thank you all for your kind feedback! :D You guys got me interested in a dual CQM/OPL3 switched setup, it'd be perfect for FM comparisons. No more trying to get two or three Sound Blasters running together coherently! When I get my next paycheck, my next mission would be to acquire a (non-destroyed) …

Re: I de-CQMed my AWE32 PnP CT3990...!

Posted on 2018-01-03, 05:06

It'd be better to toggle the chip select pins. You don't want to arbitrarily power up and down chips that aren't designed to do that - unless you mean, switching the chips while the power is off, and just using the selected chip only while the power is on. On the YMF289B-S, the /CS pin is pin 13. …

Re: I de-CQMed my AWE32 PnP CT3990...!

Posted on 2018-01-03, 00:25

Well, the YMF289B and CT1978 use the same shared data bus, and the TDA1387 and YAC516 output over shared sound left/right lines. Not sure what the software side implications of running both CQM and YMF289 over the same card would be. I'd imagine one could just wire in a DPDT switch to select which …

Re: I de-CQMed my AWE32 PnP CT3990...!

Posted on 2018-01-02, 20:28

Before I continue, let me just say this: this information is provided as-is, free of charge, with no guarantees of any kind. OK, now that that's out of the way, let's try reverse engineering the caps I put in there... For reference, all part references are specifically for the CT3990. Other models …

Re: I de-CQMed my AWE32 PnP CT3990...!

Posted on 2018-01-02, 18:29

Well, you also need the 33.88 MHz ceramic resonator, and a bunch of passive capacitors and resistors, and some electrolytic capacitors. Unfortunately I did not identify the values of the capacitors as I was swapping parts from the donor CT2900 into their respective locations on the CT3900. However, …

Re: I de-CQMed my AWE32 PnP CT3990...!

Posted on 2018-01-02, 18:02

Ask and ye shall receive. :) IMG_0479.JPG I cleaned up the board after taking this shot, it looks much less fluxy in real life: IMG_0480[1].JPG Those with a hot-air station will probably find this much easier going than I did, I had to use my Elenco soldering iron with SRA Fast Chip, which …

I de-CQMed my AWE32 PnP CT3990...!

Posted on 2018-01-02, 05:21

I've had this CT3990 lying around for the longest time in my room. As it had Creative's awful CQM b*stard child instead of a half-decent FM chip, I utterly refused to use it. Well, today I worked up the courage and scavenged the needed parts off a CT2900 ViBRA 16S, and removed both the CT1978 CQM …

Re: Building a K6-2 Socket 7 System

Posted on 2016-12-23, 21:31

So I don't really need to bring L2 cache into consideration when accounting for compatibility? So I might as well use a K-6 III+ since at the end of the day its likely going to give me about the same result, correct? Yep. Just grab a board with at least 512KB of cache, more is better but they can …

Re: Building a K6-2 Socket 7 System

Posted on 2016-12-22, 03:50

Hi! I agree with clueless1, it depends on what games you're looking to play with this rig. Bear in mind the K6-2 may run some older games way too fast, so you'll want a utility that can throttle the processing speed (one such game with a speed sensitivity is Apogee's Dark Ages). Actually L2 cache …

Re: 486 FPU vs 387 ?

Posted on 2016-12-16, 06:16

Not sure, exactly. It could be that they either work around some problems that certain revision Cyrix 486DLC chips have with generic 387 FPUs, or they could be revised versions with improved performance and/or standards compliance (such as ULSI's DX/DLC / SX/SLC line). As an aside, I rather like …

Re: 486 FPU vs 387 ?

Posted on 2016-12-15, 15:57

The fastest 387 FPU, the Cyrix FasMath 83C87DX, simply can't hold a candle to even a lower-clocked 486DX FPU. I used to own a FasMath on my Blue Lightning 486BL so I could testify that. A Weitek 3167 might be a bit of a different story, but unfortunately most programs outside of specific CAD …

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