Re: IBM PS/2 80 Series motherboard

Posted on 2021-11-28, 23:05

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

oh no... you're in MCA madness, welcome :) your best luck actually is to go with scsi. then a sd2scsi, or an acard adaptor. actually, there's no CF/IDE solution. ide controller exist (there's one model for sure) but it's not a standard ide, dos and windows can't use it natively. and is not bootable. …

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Re: IBM PS/2 80 Series motherboard

Posted on 2021-11-28, 20:43

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Short answer, NO. Long answer, yes. - There exists upgrade boards for most PS/2 machines. They exist in the same way that a virgin exists at a whorehouse. If you're lucky enough to find one, its going to cost you an arm and leg. And I'm not being funny. The last 286 > 486 upgrade board I saw for …

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Re: New processors for old sockets.

Posted on 2021-11-13, 17:36

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just imagine your old IBM 5150 running doom with the original board (and a futuristic computer shoved in the CPU socket) there's a big difference between pc and amiga, the amiga had the ability to have his local bus extended. this can easily make use of the accelerator local fast ram, local drive …

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Re: 486 Motherboard blown capacitor

Posted on 2021-11-02, 12:52

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

it might just be the manufacturer "signature". but nothing you have to worry about. just replace it with what you found, and you'll be fine. 😀

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Re: 486 Motherboard blown capacitor

Posted on 2021-10-31, 13:47

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

remove it, and measure voltage to see what margin you'll need. but as 12V is the max voltage on motherboard, you can always put 16/25V anywhere on the mothertboard and be totally safe. you can replace it with regular aluminium capacitor, or pick antoher tantalum. for the value, it's not very …

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Re: Amiga 500 workbench help kickstart roms

Posted on 2021-10-29, 10:16

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I mean, a little RAM upgrade and a simple CPU swap (68000 out, 68010 in) is one thing. Installing an huge, expensive behemoth of a CPU card something completely different. It's like installing a parasite on a host. it's a really weird point of view. in fact, you don't like the native ability of the …

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Re: Suggestions for build on a PS/2 77s?

Posted on 2021-10-17, 17:50

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The ram ***SHOULD*** be standard 72 pin simms. they are. BUT... as any desktop PS/2, it'll require parity. not ecc as you said, but parity. then, memory need the presence bit to be set according to their capacity/speed, that's a point where you can easily be trapped, as a lot of fpm/edo sticks …

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Re: Recapping Capacitor List

Posted on 2021-10-13, 15:28

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So basically anything near the output where the atx connector is should be low esr then? if you want to know where you go : check the original capacitor brand serie datasheet, and see what they say... on psu output, if they did their design with "normal" ones, you can go in regulation troubles with …

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Re: Amiga 500 workbench help kickstart roms

Posted on 2021-10-10, 13:57

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There's a difference, though, I think. :) If you added a NEC V20/V30 to any random XT, it would become very compatible with most DOS software, way up to the end of the 90s. i don't really get your point here. the fact is few moderns program run on 8088. even if V20 or 30. The Amiga platform was …

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Re: Amiga 500 workbench help kickstart roms

Posted on 2021-10-10, 04:16

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Unfortunately, to my experience, the Amiga community is obsessed with upgrading beyond recognition. Thus, only a few modern programs will run on unmodified Amigas from the 1980s: 68000/68010* CPU, Kick 1.2/1.3, WB 1.2/1.3, OCS graphics of course, because "amiga" is not only the amiga 500. there's …

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Re: Power Supply Recap?

Posted on 2021-09-20, 13:40

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

yes, look for brand and series letters (usually 2 or 3 letters) then look for datasheet. "regular" esr, is usually given with 120 Hz frequency. and low/ultra low are usually expressed with 100 Khz frequency. but when they are low esr/impedance, it's (usually again :D) clearly stated in datasheet. …

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Re: Power Supply Recap?

Posted on 2021-09-20, 08:10

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

For those get low ESR caps, but try to avoid the ultra-low ones, those may cause problems. Good series for a PSU of that era would be Nichicon PW/PM, Rubycon YXF/YXG or Chemi-Con LXZ. Try to search for series with specs similar to those. i second this. on primary side, you can mostly pick what you …

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Re: Floppy drive only reads disks if formatted in that drive

Posted on 2021-09-13, 07:52

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

mR_Slug say all. that's the only, and official way to realign a 3.5" drive. don't mess directly on heads, or the track 0 sensor.

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Re: PCB card-edge connector gold plating

Posted on 2021-09-09, 15:35

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

not false, isa like connectors already have well curved and spaced "teeth" so it's really really more tolerant to non beveled edge. not like pci like connectors. Tiido : yes, i tend to forget we don't speak about 100% tin and 100% gold :D there's probabely others metals which can interact in each …

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Re: PCB card-edge connector gold plating

Posted on 2021-09-09, 06:00

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

HASL is going to ruin the slot it is put into (the gold plating in the slot is going to be damaged), if you're gonna use it in that one slot it should not be moved into any of the others. how is it possible ? tin is more soft than gold plated (or not) "teeth" in the connector. there's absolutely no …

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Re: Thermal tape ripped CPU die off of substrate

Posted on 2021-09-09, 04:49

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

honestly, for very temporary use, you can use any regular grease used for mechanics. like lithium grease. they act, and have heat conduction properties. they do the job, and that's fine for those kind of cpu. graphite grease should certainely be fine too. now, i think you can still use it for making …

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Re: sanyo MBC...

Posted on 2021-05-05, 17:40

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

hmmm i finally found something about the chipset... and in fact, this machine is more a PS/2 model 30 8086 clone than an AT. http://www.bitsavers.org/components/chipsAndTech/1989_Chips_And_Technologies_Short_Form_Catalog.pdf so, you think sanyo made the choice to only limit extra ram as ems only ? …

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Re: sanyo MBC...

Posted on 2021-05-05, 17:23

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

you maybe right, someone else suggest me the same. i tried to see with qram if something happen, but it's a no go, it just hang when run optimize for the first time. i don't know if he require something more proprietary driver. if you know something i can try ? he actually run pc dos 7. for the 8 …

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sanyo MBC...

Posted on 2021-05-05, 13:21

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

no, not a 550 series, but... 25 Plus. it was a kind of teaser :D don't look for it on google, you'll find nothing at all. this is what we can call a kind of "VINTAGE COLLECTOR RARE" machine, priceless... so, it's a "semi AT" clone, as it's a 286 @ 12,5 Mhz, but with only 8-bit isa slot. but got an …

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Re: ISA bus extender using ribbon cable and passive backplane; max length of cable?

Posted on 2021-03-29, 02:34

by

by whaka

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

i never tried OS/2 on it, but i heard too it didn't work.

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