Re: XT clone motherboard repair advice/help needed (KT 10 M/B)

Posted on 2019-04-17, 22:40

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There is also another aspect, the fan-out problem. As the TTLs have quite low input resistance, they suck much current. And the TTL outputs can deliver only so much current until the signal gets out of the logic levels tolerances. Thus the chips have defined fan-in and fan-outs. Iirc a typical …

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Re: Emm386.exe needed to enable L2 cache?

Posted on 2019-04-17, 22:10

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

HIMEM.SYS turns on A20 gate

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Re: What retro activity did you get up to today?

Posted on 2019-04-17, 21:25

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sifted through my ancient backups and found the most important stuffs: -the configuration files with the environment for the compilers I used in the 1990s -backups of some *very* nice utilities I loved much: Underware Brief Editor 3.1, NuMega Soft-ICE 2.5 And also some of my old utility programs I …

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Re: Old tech and battery questions

Posted on 2019-04-17, 18:44

by

by retardware

in Milliways

in Milliways

The Germany-made battery pictured is of very high quality, and this has its price. The capacity difference does not matter, as the charging process is voltage-based. RS is not cheap. You can look around for reputable distributors in your local area, too. You were talking about a 10V 750mA wall wart …

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Re: Old tech and battery questions

Posted on 2019-04-17, 13:21

by

by retardware

in Milliways

in Milliways

My Nokia 9110's batteries are almost dead too. Maximum 15 minutes capacity left. I looked into a battery pack (a "compatible" one): https://i.postimg.cc/qRcnzC2m/DSCN9864.jpg https://i.postimg.cc/fWty2dV1/DSCN9862.jpg https://i.postimg.cc/5232YqrQ/DSCN9863.jpg As you see, there is charging circuit …

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Re: Old tech and battery questions

Posted on 2019-04-17, 12:17

by

by retardware

in Milliways

in Milliways

It amazes me again and again what people do. Putting LiIon packs in place of NiMH is just haphazard, might result in a blaze. Search on good electronics distributors' websites (RS, Farnell, Mouser, Reichelt, Conrad, just to name a few) and search for NiMH cells with solderable fins. Then build your …

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Re: What retro activity did you get up to today?

Posted on 2019-04-17, 09:19

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What would be the right way to calibrate the heads? I got the idea from fiddling with a 1542 Commodore drive, which I will admit is much more tolerant of shift. Using a calibration diskette and an oscilloscope. Calibration diskettes are very special, they have the tracks written with various analog …

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Re: Using dd to clone disk while preserving CHS data

Posted on 2019-04-16, 21:33

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

what does linux "fdisk -l /dev/sdb" say about the partition table on the old drive?

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Re: My new 486-386 junk boards [IT gore]

Posted on 2019-04-16, 19:01

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Deksor wrote: Perhaps this is why the socket was broken ? Vividly imagining the surprised face of the previous owner when he noticed that the upper part of the socket was thermally melt-glued to the CPU after finally having succeeded to lift off the CPU 😁

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Re: Manual needed Fujitsu/ICL Indiana

Posted on 2019-04-16, 18:55

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Post photos. Here are gurus who can identify even the craziest mobos. (no I am none of these 😀 )

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Re: My new 486-386 junk boards [IT gore]

Posted on 2019-04-16, 18:41

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

See that black mark ? It's not a shadow, it's something on there. Also I remember having difficulties removing the jumper on that was on this exact same pin, so it's highly possible the trace inside the board actually burned ! The PCB layer delamination is clearly visible. And the solder tin is …

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Re: Help Identifying Old ISA card

Posted on 2019-04-16, 18:28

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This kind of stuff is practically useless outside of lab context. There is always some proprietary software connected with it, which is hard to impossible to find. But as parts donator its sometimes good imho.

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Re: Manual needed Fujitsu/ICL Indiana

Posted on 2019-04-16, 16:17

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Look inside for the Fujitsu numbers and search using "site:fujitsu.com". Fujitsu service is outstanding, you can download even ancient documentations from there.

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Re: CDRom not visible / working in Windows 98

Posted on 2019-04-16, 13:07

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did you use Ontrack or such? These problems are just normal if one uses this.

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Re: Bought these (retro) hardware today

Posted on 2019-04-15, 23:52

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Btw, cats love carpets that aren't antistatically treated. And I have shot enough stuff to have become paranoid about static electricity 😀

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Re: mainboard clock flies too fast

Posted on 2019-04-15, 23:44

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Dunno which oscillator is responsible in this case. Original PC had no RTC, derived its time from the 18.2Hz tick generated from the 14.318MHz system clock. Could even be a problem in the clock divider logic, making the 18.2Hz tick too fast. Does somebody know whick clock is being read by the BIOS …

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Re: Trantor T-128 and SCSI2SD issues

Posted on 2019-04-15, 22:38

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are you able to use a more standard 16-bit ISA SCSI card in your system? I use mine with a AHA-1540/1542CP, but also tested the cheaper AHA-1520/1522B. These Adaptec controller support up to 8 GB drives. So I setup SCSI2SD as an 8 GB drive and use FDISK to partition it into two 2 GB partitions and …

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Re: Jumper settings for STB Trident 9000 ?

Posted on 2019-04-15, 15:40

by

by retardware

in Marvin \ Video

in Marvin \ Video

Maybe retry with the both expansion RAM chips pulled from the card. Sometimes bad RAM or bad socket contacts occur.

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Re: Fibre Channel Disk Arrays - Anyone use them?

Posted on 2019-04-14, 12:16

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As @Zup said, the FC stuff is practically useless nowadays. This is also reflected in the throwaway prices of this stuff being dumped. On the other hand, the old SCSI server stuff (U160, U320) is quite useful for retro users who want to have spinning rust and avoid the IDE nightmares. These drives …

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Re: Bought these (retro) hardware today

Posted on 2019-04-13, 22:35

by

by retardware

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the info on the ESS card. So it is not the bottom quality class. :) Actually I am looking for an ISA vga that can be software-tuned to different screen refresh rates, for reducing CRT flicker. Spea cards do that. But they are hard to find. :angry: And it might even turn out that they also …

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