Re: turbo segment display

Posted on 2019-06-12, 10:53

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

From looking at the picture you posted, and informed by looking at (http://www.minuszerodegrees.net/led_speed_display/LED%20display%20-%20GK-01.jpg)... Look at http://www.minuszerodegrees.net/led_speed_display/LED%20display%20-%20GK-01.jpg On your board, the pinout for HUN, TEN and ONE matches the …

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Re: Early laptop power adapters (Toshiba 9V)

Posted on 2019-06-08, 08:45

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

More info: http://www.vcfed.org/forum/archive/index.php/t-19849.html Voltage: Computer DC input - 9VDC, 1.1A (+ = core; - = shell) Battery: Internal rechargeable NiCD battery pack 9V @1.1A is a bit of a tall order for a DIY PSU. I would recommend getting your hands on a decent 0-30v 2A bench power …

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Re: Early laptop power adapters (Toshiba 9V)

Posted on 2019-06-08, 08:32

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You need to be careful with your terminology - you have a T1100plus you do not have a T1100!! and power wise it appears they are not the same. From a bit of quick googling I found the following pages, which make it clear that the T1100 is different from the T1100plus. Note - both pages have " …

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Re: XTIDE on 3C509B card

Posted on 2019-06-03, 09:02

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It looks like you have got the hardware side of the ROM working - any problem is with the XTIDE image configuration (done with XTIDECFG), or CMOS configuration. I would try the following: 1) Clear the CMOS contents, boot the PC, open the (XTIDE) setup menu, and ensure that everything is set …

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Re: Compact Flash to IDE jumper question

Posted on 2019-05-26, 08:11

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I guess that triangle has a similar meaning as an arrow or dot. I agree - the triangle usually means pin 1. The 5v vs 3.3v thing could be related to the CF card power. Perhaps it has an on-board voltage regulator for 3.3v.. If the OP could post a picture of the back of the adaptor, we could confirm …

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Re: Laser printers suitable for dos.

Posted on 2019-05-23, 11:35

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The easier route would probably to fire the data over to a Linux box (maybe using lpr over a network, or with a bit more difficulty over a serial port) and then let the Linux box translate to whatever the printer speaks (via CUPS). A more intelligent filter would be able to detect and handle …

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Re: How to install ms dos without diskette drive or cd?

Posted on 2019-05-01, 11:09

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The hardest bit when installing DOS is partitioning the hard drive (DOS fdisk is functionally limited), the next difficult bit is booting DOS so you can formatting the hard drive partition and making it bootable. "Installing" DOS is as simple as copying files across. Personally I would do the …

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Re: Can someone identify these cards?

Posted on 2019-04-28, 09:09

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Three fuzzy logic cards?

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Re: Physical floppy drive switch?

Posted on 2019-04-17, 23:20

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

what about second ide (hdd+floppy) controller? wont work? I have simmilar issue - I have floppy 3.5 & 5.25, and I have QIC80 IOMEGA TAPE 250 and dont know how to have all 3 drives working. That's a different problem. The tape drive probably requires some kind of driver. The driver probably speaks …

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Re: Physical floppy drive switch?

Posted on 2019-04-17, 11:08

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hey all, So the situation is this: I have a 486 system with a 3,5" A: drive and a 5,25" B: drive, and I want to keep both but also install a Gotek floppy emulator. Of course the floppy controller only supports two floppies, so I was wondering if one can easily build something to physically switch …

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Re: most compact 8088/8086 board you've seen?

Posted on 2019-04-14, 16:43

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

alvaro84 wrote: It makes sense. But 8088 memory accesses are already slow enough without the chipset doing two for every request 😁 Clock the RAM access circuitry at 2X CPU frequency, and speed won't suffer.

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Re: most compact 8088/8086 board you've seen?

Posted on 2019-04-14, 13:22

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have this board: https://stason.org/TULARC/pc/motherboards/H/HEDAKA-8088-HED-918.html How can it have 5 pieces of 4-bit RAM chips? :exclamation: It uses the 4 bit chips to do 8 bits. So a 44256 (4x256k) becomes 8x128k For every memory read, do two read accesses Set the most significant bit of the …

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Re: EISA and ISA expansion card ID

Posted on 2019-03-20, 17:41

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Any chance of a higher resolution picture of each individual card? Unless you provide a picture or series of pictures where you can read the board markings or the devices on the board, there's almost no chance of identifying them.

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Re: Gotek floppy emulator colours?

Posted on 2019-03-08, 09:38

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have a few metal case covers that I need to paint as well. Anyone have a North American rattle can recommendation for 2-tone speckled beige (metal case) and 1-tone beige (Gotek)? Nobody (other than Bill Gates when he got his first AMC Pacer lol) would drive a car painted PC beige. If you want the …

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Re: Help needed for Cooler Master Cavalier 2 case VU meter

Posted on 2019-03-06, 13:31

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

OK the quick version: Get a length of twin screened cable - cable that has two cores surrounded by an overall screen. At the VU meter board end, wire it to a 0.1 molex connector. Pin 1: Core #1 Pin 2: Screen Pin 3: Core #2 The other end gets soldered to the speaker outputs on the back of your sound …

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Re: Help needed for Cooler Master Cavalier 2 case VU meter

Posted on 2019-03-05, 11:09

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Whatever is on the back panel, it has to be passive - the only connections appear to be the two 3.5mm connections exposed on the back plate, and (looking at the cable) a 2.5mm plug inside the case which then connects to the spare connector below the molex power connector. Can you: 1) Extract the VU …

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Re: And then there was white smoke...

Posted on 2019-02-27, 20:50

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BTW: Even if the lead is rated for 7 amps only, it can bear a lot more for a short period of time without glowing and insulator melting, which is enough for the PSU to sense the over current and shut down. How can a 35A power supply differentiate between a normal 10A load and 10A flowing though a …

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Re: And then there was white smoke...

Posted on 2019-02-26, 13:12

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Good PSUs have short circuit protection and would have cut out in a shorting situation like this. You have to detect the short circuit in the first place. In this case the circuit (PSU - red wire- floppy w/dead short - black wire - PSU) wasn't a dead short - the resistance of the wires, whilst …

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Re: Jumper manual needed for ISA IDE CD-ROM card - 74-1881A

Posted on 2019-02-24, 09:34

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

But the DIP shows that up is ON, meaning '1'. That doesn't necessarily follow - it depends on how the electronics is implemented. In all likelyhood the DIP switch is feeding multiple inputs on the chip, which have a resistor (inside or outside the chip) to ensure that an unconnected input is pulled …

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Re: Can you ID this card ?

Posted on 2019-02-23, 19:03

by

by mdog69

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Flog it on ebay, and if it doesn't sell, pull the two FIFO devices, and flog them on ebay and scrap the card...

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