Re: Something old and Something new (386 build)

Posted on 2018-08-31, 04:37

by

by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

I don't think you will need to change any PALs. First I would check if all the address lines for the cache have been wired to the chipset. If they have, then all you should have to do is add a few wires to the chipset to set the cache size. I believe it is documented in the CS82310 databook.

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Re: Something old and Something new (386 build)

Posted on 2018-08-30, 02:17

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by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

I would guess your board has no cache jumpers because the board was only designed to work with one cache size: 64kb. (even though the chipset supports more)

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Re: Something old and Something new (386 build)

Posted on 2018-08-29, 06:29

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by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

I believe the part number on my 12ns 64kx4 chips is Cypress CY7C194-12PC. However, different types of tag chips are used depending on the size of the cache. For 32kb cache, a single 8kx8 tag. For 64kb cache, two 16kx4 tags. For 128kb a single 32kx8 tag, and for 256k two 64kx4 tags. My board has the …

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Re: Something old and Something new (386 build)

Posted on 2018-08-28, 07:06

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by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

Good to here you have the 256kb of cache working! What are your cache settings? How many bits are your tag ram? .... 50Mhz is totally fine, 62.5 Mhz (125mhz crystal) seems fine for the board, but it is too fast for the L1 cache on chip, as soon as its enabled it crashes. I also needed 12ns tag …

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Re: DOS Lemmings with Digital Sound Effects?

Posted on 2018-08-27, 12:18

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by Anonymous Coward

in Milliways

in Milliways

I am relatively certain that the copies of lemmings that came with both my SB 2.0 and SB16 allowed both sound fx and midi in game.

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Re: My Ultimate VL/EISA 486

Posted on 2018-08-27, 02:31

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by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

I don't think insulating a pin in this case is going to work. There seems to be some kind of BIOS or timing incompatibility with the Cyrix 5x86 on this board. On my POST card, my BIOS gets stuck at code 05 with the 5x86 installed. Soft reset/power-on determined. Going to enable ROM. i.e. disable …

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Re: Something old and Something new (386 build)

Posted on 2018-08-27, 02:27

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by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

As far as I know, it doesn't heat up. However, I haven't used this one for extended periods of time. It's not a very useful speed. I believe I got this one for attempting to run a Cyrix 5x86 at 133 using the 3x multiplier. This one would do 127.5MHz, an intermediate step between 120 and 133.

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Re: Something old and Something new (386 build)

Posted on 2018-08-26, 15:23

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by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

Yes, I'm using the FU340 BIOS. Officially it's the FU3 V8 BIOS. Windows 3.11 seems to load fine. BTW, here is the oscillator adapter I was talking about earlier.

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Re: Something old and Something new (386 build)

Posted on 2018-08-26, 06:55

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by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

I tested your BIOS image on my FU340, but my system would not post (black screen). Also, I tried using eight 64kx4 SRAMs rather than eight 32kx8 SRAMs in attempt to get 256kb cache going. The result was also that the system would not turn on. *edit* I was checking over the various FU3 type boards on …

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Re: Something old and Something new (386 build)

Posted on 2018-08-25, 10:58

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by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

I was able to score 4682 realtics in DOOM using an SXL2-50 in 50x1 mode on an OPTi 495SX board. I think that works out to 15.95FPS. That is an all time record for me. From what Feipoa has gathered, 55MHz is just about all you're going to get out of a 5V SXL2 chip. I tried 2x30 (60MHz), but it didn't …

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Re: ISA Modems.... should I keep any?

Posted on 2018-08-24, 05:35

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by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I would only keep USR hardware modems....or maybe some of the very early classics like the Hayes Smartmodem.

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Re: Help with dead Daewoo AL486V-D motherboard, -- on POST card

Posted on 2018-08-24, 00:52

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by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

-- on the POST card is a pretty common problem. I have several motherboards that have the same problem, and the cause could be just about anything. More than likely, there's a bad solder joint or tantalum somewhere on the board. Check the BIOS socket for corrosion.

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Re: Turbochip amd 133mzh cpu fan upgrade

Posted on 2018-08-20, 14:28

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by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The funny thing is though, of the five 5x86-133 chips I own, only my ADZ won't overclock to 160. My three ADWs and one BGC all do it fine.

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Re: Alcatel ALC 8551

Posted on 2018-08-20, 05:59

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by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

That's pretty badass. This is the first time I've seen a 386SX motherboard with a 486 CPU socket. I wonder if it uses a 16-bit or 32-bit board. I have seen systems like ALR which can take anything from 286 to 486, but those use CPU cards.

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Re: 286 build

Posted on 2018-08-20, 05:54

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by Anonymous Coward

in Marvin \ System Specs

in Marvin \ System Specs

I like the turbo lights on this case. You totally need a board that can switch between 12 and 16MHz. For VGA, I would go for one of the Orchid Pro Designers. Either should be okay.

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Re: Turbochip amd 133mzh cpu fan upgrade

Posted on 2018-08-20, 02:38

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by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

How come in the photo, the motherboard you are using looks to be a 3.3V one, yet you are still using a VRM?

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Re: Turbochip amd 133mzh cpu fan upgrade

Posted on 2018-08-19, 14:41

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by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Absolutely. I think just about any 3.3V 486 chip would work in that converter. The chip that's presently installed in the adapter is not special in any way. It should just be a regular 5x86-133 with a fan glued to it. After you remove the current CPU from the adapter, look at die cap on the bottom. …

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Re: Tillamook 266MHz and working L2 cache?

Posted on 2018-08-19, 12:50

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by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Those would be the "Flying Tigers".

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Re: Tillamook 266MHz and working L2 cache?

Posted on 2018-08-19, 11:42

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by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yup, 300MHz Tillamook was a real thing, unfortunately only as surface mount. This particular one is on a Chinese/Taiwanese PGA adapter. I think CPU-World refers to these as "golden tigers", not sure why.

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Re: Turbochip amd 133mzh cpu fan upgrade

Posted on 2018-08-19, 11:34

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by Anonymous Coward

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Cool, I didnt' release that some of the turbochips had PGA CPUs. I am pretty sure you can remove the CPU from the VRM. I recommend you peel the existing fan off the CPU and get a standard 486 heatsink/fan combo for it.

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