Re: SCSI Adaptec AHA-2940UW vs AHA-2940U2W differences?

Posted on 2021-04-26, 04:47

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The main difference is that the 2940U2W uses LVD transfers with 80 MByte/s. It has an external 68 pin connector and an internal 68 pin connector for LVD devices. But it also has internal 50 pin and 68 pin connectors for SE devices. The clou is the AIC-3860Q bridge that connects that 2 buses together …

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Re: $10 386DX/486DLC machine adventures: repairs, upgrades, and feature installations

Posted on 2021-04-25, 08:59

by

by Disruptor

in Marvin \ System Specs

in Marvin \ System Specs

Oh cool, it has EISA slots, shame there were no EISA cards installed in the system! No, it has not! DO NOT PUT EISA CARDS INTO THE SLOTS. I clearly can read the printing "LOCAL BUS". It is not EISA, but OPTI local bus. https://www.vogons.org/viewtopic.php?f=46&t=64133 However, there are at least 2 …

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Re: Strange Floppy Disk behaviour 486

Posted on 2021-04-24, 19:44

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

After FDISK /MBR do nothing else but turn your computer off. No Ctrl-Alt-Delete or anything. Just power off and then try to boot from your hard disk. I recommend to write protect that floppy.

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Re: 486DX-50 MHz EISA system

Posted on 2021-04-06, 09:47

by

by Disruptor

in Marvin \ System Specs

in Marvin \ System Specs

How quick are your SIMMs? I've noticed that my system does not run stable with 8 9x4 MBit 70 ns chips. The problems passed when I've replaced ONE bank with 2x16 Mbit + 4 MBit parity 60 ns SIMMs. Now I use two banks with 2x16 MBit + 4 MBit parity 60 ns SIMMs.

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Re: 486DX-50 MHz EISA system

Posted on 2021-04-06, 09:02

by

by Disruptor

in Marvin \ System Specs

in Marvin \ System Specs

I have 18-19 MB/s on my AHA2740 on the FAST WIDE SCSI port. It's a DX-50 too But I don't get past 25 MBit/s with my 3COM 3C597-TX (Windows NT 4.0) or 14 MBit/s (Windows 95)

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Re: My 'new' Windows 98SE Pentium 200 MMX.

Posted on 2021-04-01, 08:37

by

by Disruptor

in Marvin \ System Specs

in Marvin \ System Specs

Woody72 wrote on 2021-04-01, 08:10: ... It will cache up to 64MB but will cache 512MB if it has the correct TAG ram - are there any utilities that will let me find out one way or the other? ... Use ctcm 1.7a from Andreas Stiller / heise. ftp://ftp.heise.de/pub/ct/ctsi/ctcm17a.zip

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Re: Booting from SCSI HD with ISA SCSI controller, how does it work?

Posted on 2021-03-31, 00:45

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is it possible on a socket 3 or Socket 7 system? I've used an Adaptec SCSI controller and CDROM ages ago and I remember having to load drivers for the adapter and CDROM of course. Can you boot direct from a SCSI HD with an add on controller without drivers? Is there a guide someone can point me to? …

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Re: USB 1.1 Front Panel for 440BX Based System - Options?

Posted on 2021-03-31, 00:26

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My ASUS P2B-D based system has two USB 1.1.ports on the motherboard. I'd like to add a 5.25 bay panel with a couple of ports if possible, so I don't always need to go around the back. For a system of this era, what would the options be? Was the concept of case or panel headers even a thing when USB …

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Re: Why are 3Com NICs in such high regard?

Posted on 2021-02-14, 17:31

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Which Linux distro do you use on 486 PCs (this one has no CPUID instruction)?

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Re: Why are 3Com NICs regarded in such high regard?

Posted on 2021-02-14, 16:14

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've finished my tests with an EISA 3Com 3C597 (100 MBit/s). Win95C --> Windows 10: 14.5 MBit/s (from cache) WinNT 4.0 --> Windows 10: 25 MBit/s (from cache), 22 MBit/s (from disk) CPU: 486 DX 50 RAM: 32 MB Controller: Adaptec 2740W EISA Fast-Wide SCSI (18 MByte/s max) The 486 motherboard just has …

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Re: Dallas DS12887 longevity

Posted on 2021-01-09, 22:13

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There's a register in the nvram that controls whether the internal oscillator runs. It ships from the factory with it disabled to preserve the battery. It is possible to disable it via software, which will prevent the unit from keeping time but prolong the battery life during long-term storage. Yes …

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Re: Do Tualatin core CPUs burn out without a heatsink on?

Posted on 2021-01-04, 07:42

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As far as I remember, P4 cpus throttle, P3 cpus halt and can be rebooted after cooling down, and Athlon dies burn. However, I do not know which core types and revisions are meant.

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Re: 486-DX4 50mhz?

Posted on 2020-12-17, 19:22

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Perhaps it is running in deturbo mode at 16.6 MHz 16.6 * 3 = 50

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Re: Real hardware DOS gaming console for HDMI displays

Posted on 2020-12-13, 05:09

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Tiido wrote on 2020-12-12, 13:02: I'm veeery slowly working on a VLB video card, which has DVI output (which would work with many devices with HDMI inputs). My hands are full with other stuff though and it will take years before it is done... Fine. Which graphics chip do you consider?

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Re: Intel DX4-100 Overclocks?

Posted on 2020-12-13, 05:05

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

AJ49er wrote on 2019-07-26, 14:51: ... This is with 256mb cache, 64mb RAM so I'd be interested in more information on your 66mhz overclock! Please remember that 256 kB cache in a 486 grants a cacheable area of 32 MB in write back mode and 64 MB in write through mode. What SRAM and DRAM timings do …

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Re: Real hardware DOS gaming console for HDMI displays

Posted on 2020-12-10, 05:48

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have two systems with that specs. One platform is the Intel one on a P3B with BX chipset and ISA slot populated with an AWE64 Gold. CPU is a P3 700. The graphics card is an AGP GeForce 6200 with a DVI connector. Both sound card and graphics card are connected to a TV. Happily the TV plays the …

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Re: SCSI woes - various cards, various systems, various CDROMS.

Posted on 2020-12-09, 05:13

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Perhaps it does not like synchronous transfers. Try to change it in controller's device settings.

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Re: DOS SCSI headaches AHA-2940AU vs ASPI8DOS.SYS installation failed

Posted on 2020-12-08, 10:25

by

by Disruptor

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Try to force it on a different IRQ. Are your PCI interrupts triggered by level or edge? Try another PCI slot.

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Re: AMD DX4 100MHz build

Posted on 2020-11-20, 20:58

by

by Disruptor

in Marvin \ System Specs

in Marvin \ System Specs

SZ959 -> 16 KB cache. Interesting.

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Re: AMD DX4 100MHz build

Posted on 2020-11-20, 19:16

by

by Disruptor

in Marvin \ System Specs

in Marvin \ System Specs

Disruptor wrote on 2020-11-20, 19:13: The Intel 486 dx 4 - 100 with 16 kb write back cache is really good. Can you post a speedsys chart of your 486 / 100 overdrive? (I'm interested in your cache chart.)

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