Re: Pentium Overdrive competition - socket 3/4/5/7

Posted on Yesterday, 20:31

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not really, pentium OD 83mhz, intel custom designed the die and left off many features that makes up real pentium so you cannot get full benefit of pentium. https://www.os2museum.com/wp/intel-overdrive-part-ii-pentium-overdrive/ Yes, I know about this. In the article Michal is making a claim that …

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Re: Pentium Overdrive competition - socket 3/4/5/7

Posted on Yesterday, 16:58

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by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

CoffeeOne wrote on Yesterday, 16:43: I agree, that changing FSB will have a big impact. So we can't give good estimations 😁 So do you change the FSB or not? Yes. I will change FSB as needed to satisfy nominal ratings of overdrives chips. Those FSB jumps are there to make things more interesting 😀

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Pentium Overdrive competition - socket 3/4/5/7

Posted on Yesterday, 14:53

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Some of us are having more free time at home lately. :) Let's burn some on crazy retro projects! I built 4 retro systems: Socket 3 - 486DX2-66 P24D on MSI4144 board with SiS496 chipset Socket 4 - Pentium-60 P5 on Intel Batman's Revenge board, 430LX chipset Socket 5 - Pentium-75 P54C on Intel Plato …

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Re: ATI MACH64 Graphics Pro Turbo 1600 VLB (?)

Posted on 2020-03-25, 13:52

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The box clearly says GPT1600 indeed. However, ATI68860 is the part from regular Winturbo/Pro Turbo and I have it on several non-1600 Mach64GX cards. Are you sure it is actually 220 MHz DAC and it is the card that was shipped in that box? Does it support 1600x1200 @ 75 Hz? Another thing that in …

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Re: ATI MACH64 Graphics Pro Turbo 1600 VLB (?)

Posted on 2020-03-25, 11:28

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The ATI Graphics Pro Turbo 1600 was launched mid-1995. At that point VL-Bus was well out of fashion. Most likely they launched 1600 only for PCI. The 1600x1200 @75 is not the only benefit of the 220 MHz RAMDAC. It can do higher refresh rates at lower resolutions too. But the designations were purely …

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Re: Pentium 66 MHz socket 4 system

Posted on 2020-03-25, 09:58

by

by mpe

in Marvin \ System Specs

in Marvin \ System Specs

regarding the fdiv bug. does it prevent anything "normal" from happening? cause any instability? if so, why use it? The FPU is less accurate. You get wrong results when you divide certain numbers. Won't affect stability, but it has historical significance - a sort of curiosity. Intel ran expensive …

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Re: ATI MACH64 Graphics Pro Turbo 1600 VLB (?)

Posted on 2020-03-25, 07:41

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As far as I know: Winturbo = only 2MB VRAM (non upgradable). ATI RAMDAC ATI Graphics Pro Turbo = upgradeable to 4MB VRAM, ATI68860 DAC @ 135 MHz ATI Graphics Pro Turbo 1600 = upgradeable to 4MB VRAM, IBM RAMDAC @ 220 MHz AFAIK the 1600 was PCI only. Your card is likely ATI Graphics Pro Turbo. Might …

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Re: EDO vs. FPM on 430HX

Posted on 2020-03-24, 22:45

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Being in self-isolation I had some time for experiments. I've re-done EDO vs FPM benchmark on my 430HX board. The actual improvement of EDO is a little bit less than I remember it. More like +3% in Quake framerate. The +5% was in cache-less system where the difference in RAM latency is magnified. …

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Re: Bought these (retro) hardware today

Posted on 2020-03-24, 18:05

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by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

for the original '93 batman boards, the designation in the manual is actually "Classic/PCI" Interesting. Do you have any any Intel document which links the Batman codename to Classic/PCI board? I do have a manual for Classic/PCI Pentium board, but there is no codename in it. In late Premiere/PCI …

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Re: How important is a PCI graphics card in a 486?

Posted on 2020-03-24, 15:30

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by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

AlessandroB wrote on 2020-03-24, 13:56: ok ok, i know the difference between SBpro and SB16, but between SB2.0 and SBpro? apart from the cms... Stereo, mixer, faster sampling rate, dual Opl2 or OPL3, CDROM, more IRQ/DMA choices, ...

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Re: EDO vs. FPM on 430HX

Posted on 2020-03-23, 08:41

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes 244 series is a 8 channel buffer. It has propagation delay between 2.5 - 7 ns and output enable time between 2 - 8 ns which increase effective RAM access time. I think the chipset could be trying to compensate for these delays by increasing the cycle time. These delays should apply to FPM too. …

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Re: EDO vs. FPM on 430HX

Posted on 2020-03-22, 22:10

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think you can take it as granted that this board with 8 SIMM slots must use buffered RAM signals to stay within specs. The string of small chips just under SIMM slots is #1 candidate for me (can't read markings). Whether this board also supports buffer bypass ( to enable x222 EDO timing for 2 or 4 …

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Re: Bought these (retro) hardware today

Posted on 2020-03-22, 18:19

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That one is Batman's Revenge, not Batman... How do you know? :) There are several different versions of Premiere/PCI (which is the official name of "Batman" or Batman's Revenge). I believe the earlier ones are Batman and later Batman's Revenge. Just not sure when to draw the line. The AF1 vs AF2 is …

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Re: Bought these (retro) hardware today

Posted on 2020-03-22, 17:32

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

vmr_ wrote on 2020-03-21, 21:23: Please share a photo for intel Batman 😁👍 https://dependency-injection.com/wp-content/u … 02/DSC_5302.jpg

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Re: Bought these (retro) hardware today

Posted on 2020-03-22, 16:41

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

vmr_ wrote on 2020-03-21, 21:02: Soon to be tested 😀 That's amazing find. Got a ceramic 60 MHz. This one is even less common. vmr_ wrote on 2020-03-21, 21:23: and the REAL INTEL BATMAN motherboard for Socket 4. Will make a nice pair wih SX828 😀 This is not Batman, but Hendrix .

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Re: DOS games with high memory usage

Posted on 2020-03-22, 15:44

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As far as I know most DOS era games allocated just the RAM thats needed. Games derived from DOOM engine (require 4MB, can use up to 8MB) used the extra RAM to improve cache retention. All allocated RAM goes to a custom memory allocator providing memory to the engine. Some no longer needed memory …

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Re: EDO vs. FPM on 430HX

Posted on 2020-03-22, 14:17

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The buffering doesn't have to be on module. It can also happen on the motherboard - look for 74FCT3245A devices or similar close to SIMMs slots. How many memory slots that can take double density modules are on your board? If more than 4 then there must be some buffering involved. The 430HX chipset …

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Re: EDO vs. FPM on 430HX

Posted on 2020-03-22, 13:18

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

OEM systems with dual CPUs are often a bit exotic. They are likely to be using more than 4 rows of RAM which require buffering. This means that both lead-off and burst rates are increased by one to account for buffer delay. This effectively eliminates aby benefits of EDO. Or they could be penalised …

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Re: EDO vs. FPM on 430HX

Posted on 2020-03-22, 12:03

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't think you can drive FPM RAMs at x-2-2-2 at 66 MHz no matter if 60ns or 50ns. Unlike EDO the FPM cannot remove CAS during data transfer and thus it needs extra cycle and at best three cycles for burst transfer. The initial cycle is the same as in EDO. As I mentioned above the "x222 / x333" …

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Re: EDO vs. FPM on 430HX

Posted on 2020-03-22, 10:03

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by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

feipoa wrote on 2020-03-22, 05:22: You think some of these hidden settings might work with EDO instead of FPM? They didn't work with FPM. yes the first setting - (x222) is value for EDO and the one after slash (x333) is for FPM.

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