VOGONS


Reply 2940 of 2980, by HanJammer

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Some Robotron stuff. Case and PSU was effed-up beyond repair (machine had some sort of seals and somebody used brute force to get inside) but cards were pristine - I doubt anybody removed them before...

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Check out my AmiBay and eBay for ISA and PCI card, 286/386/486 Pentium motherboards and more.

Reply 2941 of 2980, by HanJammer

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More Robotron stuff... I don't really need it so all is on eBay right now...

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Check out my AmiBay and eBay for ISA and PCI card, 286/386/486 Pentium motherboards and more.

Reply 2942 of 2980, by TechieDude

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HanJammer wrote on 2020-10-30, 22:56:

More Robotron stuff... I don't really need it so all is on eBay right now...

What even is all that Robotron stuff? I haven't even heard of them.. The cards look a bit like 8-bit ISA.

Reply 2944 of 2980, by TechieDude

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K1n9_Duk3 wrote on 2020-11-01, 21:23:
wikipedia wrote:

VEB Kombinat Robotron (or simply Robotron) was the biggest East German electronics manufacturer.

Thanks, for some reason, all Google gave me was science fiction movies and arcade hardware.

Reply 2945 of 2980, by wiretap

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Pulled these out of some new old stock VME multiplexer communications boards that were being scrapped. I also found a few Evergreen 486 upgrade chips, but I need to desolder those from the boards first.

sml5orK.jpg

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Reply 2946 of 2980, by Baoran

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There is a pentium mmx cpu in the local recycling center here. The cpu seems to have 2 dents in the middle where the text is. Would damage like this prevent the cpu from working?

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Reply 2947 of 2980, by debs3759

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Baoran wrote on 2020-11-06, 22:25:

There is a pentium mmx cpu in the local recycling center here. The cpu seems to have 2 dents in the middle where the text is. Would damage like this prevent the cpu from working?

mmx.jpg

No, that won't stop it working

Reply 2948 of 2980, by pentiumspeed

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wiretap wrote on 2020-11-06, 22:04:
Pulled these out of some new old stock VME multiplexer communications boards that were being scrapped. I also found a few Evergr […]
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Pulled these out of some new old stock VME multiplexer communications boards that were being scrapped. I also found a few Evergreen 486 upgrade chips, but I need to desolder those from the boards first.

sml5orK.jpg

040RC means has no FPU. I prefer 040 with FPU.

PS: evergreen 486 upgrade, be careful especially soldering too much will make soldered pins to come off from the upgrade board with that SMD CPU.

Cheers,

Great Northern aka Canada.

Reply 2949 of 2980, by Wolfus

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pentiumspeed wrote on 2020-11-07, 01:45:
040RC means has no FPU. I prefer 040 with FPU. […]
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wiretap wrote on 2020-11-06, 22:04:
Pulled these out of some new old stock VME multiplexer communications boards that were being scrapped. I also found a few Evergr […]
Show full quote

Pulled these out of some new old stock VME multiplexer communications boards that were being scrapped. I also found a few Evergreen 486 upgrade chips, but I need to desolder those from the boards first.

sml5orK.jpg

040RC means has no FPU. I prefer 040 with FPU.

PS: evergreen 486 upgrade, be careful especially soldering too much will make soldered pins to come off from the upgrade board with that SMD CPU.

Cheers,

I thought FPU-less version is 68LC040...

Reply 2950 of 2980, by luckybob

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Wolfus wrote on 2020-11-07, 14:28:
pentiumspeed wrote on 2020-11-07, 01:45:
040RC means has no FPU. I prefer 040 with FPU. […]
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wiretap wrote on 2020-11-06, 22:04:
Pulled these out of some new old stock VME multiplexer communications boards that were being scrapped. I also found a few Evergr […]
Show full quote

Pulled these out of some new old stock VME multiplexer communications boards that were being scrapped. I also found a few Evergreen 486 upgrade chips, but I need to desolder those from the boards first.

sml5orK.jpg

040RC means has no FPU. I prefer 040 with FPU.

PS: evergreen 486 upgrade, be careful especially soldering too much will make soldered pins to come off from the upgrade board with that SMD CPU.

Cheers,

I thought FPU-less version is 68LC040...

The 68LC040 is a low cost version of the Motorola 68040 microprocessor with no FPU. This makes it less expensive and it draws less power. Although the CPU now fits into a feature chart more like the Motorola 68030, it continues to include the 68040's caches and pipeline and is thus significantly faster than the 68030.

Some mask revisions of the 68LC040 contained a bug that prevents the chip from operating correctly when a software FPU emulator is used. According to Motorola's errata,[4] any chip with a mask set 2E71M or later does not contain the bug. This new mask was introduced in mid-1995 and converted the 68LC040 chip to MC status.[5]

The buggy revisions are typically found in 68LC040-based Apple Macintosh computers. Chips with mask set 2E23G (as used in the LC 475) have been confirmed to be faulty. The fault relates to pending writes being lost when the F-line exception is triggered.[6] The 68040 cannot update its microcode in the manner of modern x86 chips. This means that the only way to use software that requires floating-point functionality is to replace the buggy 68LC040 with a later revision, or a full 68040.

It is a mistake to think you can solve any major problems just with potatoes.

Reply 2952 of 2980, by wiretap

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Here's pictures of the other new old stock scrap boards. I thought they both had Evergreen chips, but one is a PNY Quickchip.

LUxn3i0.jpg

1KCnJMI.jpg

BNOIMSD.jpg

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Reply 2954 of 2980, by luckybob

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are you pulling those DOC modules too? I've also started de-soldering and stockpiling 30/73 pin simm sockets (mostly the metal clip ones, at the moment) also the EEPROMS as well.

Hell, i'd keep the whole damn board as parts.

It is a mistake to think you can solve any major problems just with potatoes.

Reply 2955 of 2980, by wiretap

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Yes, I'll keep the boards and DoC modules. These came out of proprietary multiplexer/networking equipment that was only used at a handful of nuke plants.

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Reply 2957 of 2980, by wiretap

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Probably due to the extra speed needed for real-time data processing. These had to process thousands of data points on a millisecond resolution. (these were input rack CPU's) They would then forward the aggregate data to another set of multiplexers to be forwarded to a host CPU.

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Reply 2958 of 2980, by luckybob

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wiretap wrote on 2020-11-08, 00:49:

...extra speed needed for real-time data processing...

Shouldn't that be the domain of CPLD chips? I mean, you'd still have a x86 moving things around.

It is a mistake to think you can solve any major problems just with potatoes.

Reply 2959 of 2980, by wiretap

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I'm just guessing. I don't know the architecture of the board itself, I just know the system it was meant to be used in. This board would have sat in a nest of ADC input boards that convert the voltages to digital data at a millisecond scale, then forward it to an aggregate multiplexer via fiber.

Edit: I'll pull up the vendor manual and datasheet later. It doesn't exist on the internet that I know of, but I have a hardcopy at work.

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