Re: Some help with one interesting multifunction card (Multitech PC500+ II VIO)

Posted on 2024-03-02, 22:53

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

is there a way to read a PAL? From what I read, it can be done, in some PAL, if they do not have a "safety fuse". Apparently the ones with the letter L (like the one used on your card version) do not have internal registers and they do not do additional "logic" (I seem to confirm this by looking at …

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Re: Some help with one interesting multifunction card (Multitech PC500+ II VIO)

Posted on 2024-03-02, 22:49

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

From what I read, it can be done, in some PAL, if they do not have a "safety fuse". Apparently the ones with the letter L (like the one used on the card) do not have internal registers, and they do not do additional "logic" (I will confirm this by looking at the datasheet), so their outputs depend …

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Re: Documentation for a disk emulator card

Posted on 2024-03-02, 21:38

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I did a "little" experiment. I put 12 1Mbit eeproms (27C010) to be erased with sunlight. I checked them every day. After 4 days the first one had already been erased (initially it was not completely written, so it was partly "empty"). The erased ones were removed from the sun. the last one was …

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Re: some help to repair/restore a leaking battery ravaged motherboard

Posted on 2024-03-02, 21:29

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

finally completed the repair of the destroyed lines. I am reinserting some components that I removed to facilitate the fix (the most difficult to remove was the external battery connector) In addition to a couple of lines elsewhere broken as a result of a blow. and that same blow destroyed half of …

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Re: AGP cards problems on Compaq Deskpro EN

Posted on 2024-03-02, 21:25

by

by kinetix

in Marvin \ Video

in Marvin \ Video

Repo Man11 wrote on 2023-10-13, 02:43: What graphics cards have you tried? Dionb's recommendations in the linked thread were good. sorry I hadn't seen your comment, earlier. I was finally able to successfully test some cards. part of the problem seemed to be a dirty slot. thanks

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Re: Some help with one interesting multifunction card (Multitech PC500+ II VIO)

Posted on 2024-03-02, 21:21

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Considering how closely the I/O and CPU cards are integrated together, I'm not even sure the I/O card would work on it's own mmm, I think it would work, mostly.. but also it would not, if the main bios has specific controls for, for example, multiplexing the functions of the card, and it is not the …

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Re: Some help with one interesting multifunction card (Multitech PC500+ II VIO)

Posted on 2024-03-02, 21:18

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

retrotechrestoration wrote on 2024-02-29, 17:46: And the jumper settings... the PC 8000 looks nice

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Re: Some help with one interesting multifunction card (Multitech PC500+ II VIO)

Posted on 2024-03-02, 21:18

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I recently acquired a complete Acer PC-500+. I'm currently preparing a write up comparing it to it's cousin the Franklin PC-8000. For a "clone", the differences between the two are striking. The Acer has two main cards...a CPU card and an I/O card. Here are some additional photos of the cards from …

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Re: Bought these (retro) hardware today

Posted on 2024-02-18, 02:30

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I´m getting ready to fix five resistors in a PS/2 model 50 motherboard, destroyed by its neofit previous owner. also the damaged veins. I rescued the machine literally form the garbage and mud. Had to disassembly the keyboard down to the springs, for cleaning. I couldn't recover the bottom and the …

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

Posted on 2024-02-18, 02:26

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I´m getting ready to fix five resistors in a PS/2 model 50 motherboard, destroyed by its neofit previous owner. also the damaged veins. I rescued the machine literally form the garbage and mud. Had to disassembly the keyboard down to the springs, for cleaning. I couldn't recover the bottom and the …

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Re: Documentation for a disk emulator card

Posted on 2024-01-28, 01:57

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

wierd_w wrote on 2024-01-28, 00:26: Why build one? UV flashlights are things. Check amazon. Believe it or not, it may be easier for me to build it than buy it on Amazon or anywhere else. Plus it's more fun. If not, I can leave them in the sun for a few days, in the meantime, hahahaha

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Re: Documentation for a disk emulator card

Posted on 2024-01-27, 20:46

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

NEAT-- did you happen to have the manual laying around or what? OP: It appears per the documentation, that you can have 2 of theses in the system at the same time. One could be sporting EEPROMs, and the other could be sporting SRAMs, for a bootable romdisk, and a working ramdisk, C and D. They seem …

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Re: Documentation for a disk emulator card

Posted on 2024-01-27, 20:28

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here you go :) PCD 890 Dual Flash RAM ROM Disk Card.pdf thanks a lot this one is better, the official docs. One additional thing that I find useful about these cards is that I can use them as EPROM and FLASH programmers. FLASH can be erased too. This is good, because at least for compatible chips I …

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Re: Documentation for a disk emulator card

Posted on 2024-01-27, 20:19

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As for documentation... Round-About references, but no direct manuals. This military "thesis" from the days of Yore, goes over this card. https://apps.dtic.mil/sti/tr/pdf/ADA289134.pdf Relevant section starts on page 35 of said thesis, which documents jumper dip switches, and pals. ooo.. I already …

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Documentation for a disk emulator card

Posted on 2024-01-27, 07:39

by

by kinetix

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

greetings. I need some help getting the documentation for a card. I have gotten some "disk emulator" cards, based on EPROM/FLASH/SRAM/NVRAM, bassically an early "SSD" From the Promdisk IV (I got one) I have been able to find some documentation and software. but for the PCD-890 (I got 2 of this) only …

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Re: Any list of CGA, MDA, EGA cards with composite video on pin 7?

Posted on 2024-01-21, 02:28

by

by kinetix

in Marvin \ Video

in Marvin \ Video

Besides the composite, if I can't find one of these cards, either I will make one or a couple of converters, or one of the mods to a CRT TV to inject the RGB into it. ... damm, I have so many projects on the pipeline.... Just today I spent a lot of time deep cleaning an IBM PS/2 model 50 that was …

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Re: Any list of CGA, MDA, EGA cards with composite video on pin 7?

Posted on 2024-01-20, 02:17

by

by kinetix

in Marvin \ Video

in Marvin \ Video

well, I´ve found at least fourfive different ways of convert the signals (some are simillar), including the "original" one, in the IBM Color/Graphics Monitor Adapter tech manual, page 32, there is the schematic of the output circuit. The composite is obtained by mixing the RGB, to which is added the …

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Any list of CGA, MDA, EGA cards with composite video on pin 7 or internal pin?

Posted on 2024-01-18, 14:13

by

by kinetix

in Marvin \ Video

in Marvin \ Video

Is there any list of CGA, MDA, EGA cards that have the composite video signal on pin 7 of the DE-9 connector, or internal pins? It is difficult for me to get one that has separated composite video output, and although I can make a simple converter, a card that already has the signal ready is better …

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Re: help to ID one possible video card

Posted on 2024-01-08, 16:59

by

by kinetix

in Marvin \ Video

in Marvin \ Video

yep, is v6363. the image compression distorted a lot the last character. Ive a good eye for that (working for years on image and video processing), buts as looking for "v636" alone didn't gave any good result I tough was something else

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help to ID one possible video card

Posted on 2024-01-08, 06:24

by

by kinetix

in Marvin \ Video

in Marvin \ Video

some guy is selling two 8bits isa cards. one is a serial + parallel controller. but the second one, seems to be a parallel (printer) + "something ". that something I think is video. but I´ve been unable to identify what kind. the picture have bad quality (the one Im posting is already a little …

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