Re: 3 (+3 more) retro battle stations

Posted on 2023-10-22, 07:03

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

In my experience, 2 weeks is good as a starting baseline. After years, new discoveries unfold, as odd as that sounds. Small hardware changes to systems pushed to the max can require reduced timings or hardware swapping. It happened on most of my ~30 systems. Not necessarily related to this, but also …

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Re: 3 (+3 more) retro battle stations

Posted on 2023-10-22, 02:06

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

There's a typo, "IBM BL3 at 80MHz (3x40)" 80 != 3x40 I think it would help a lot of people to include photos of the BIOS screens for your final, most optimal settings. For my Daewoo AL486V-D system with modified BIOS, I have arrived at these settings: Panda_BIOS_settings_1.JPG Panda_BIOS_settings_2. …

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Re: AMD K7 "goldfinger" cloning thread

Posted on 2023-10-18, 19:27

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Makes me wonder why it was clocked so low to begin with . What type of software did you run on it at 735 MHz, and for how long?

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Re: UMC8881/8886 Datasheet

Posted on 2023-10-17, 12:47

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is it possible that UM8881F pin 170 is no connect (NC)? A few years ago I was repairing one of my socket 3 boards and took this image of the UM8881F pad location without the IC. The pad for pin 170 had ripped off and it doesn't look like pin 170 went anywhere. Or did this pad connect to an inner …

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Re: AMD K7 "goldfinger" cloning thread

Posted on 2023-10-15, 14:48

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Necro’ing a thread I know, but I just wanted to thank wiretap for his work on the clones, I’ve recently assembled my Freespeed Pro clone from his gerbers and BOM, and it’s great! Simple enough to solder with hot air :) Due to the JLPCB minimum quantity of five, I’ve got three spare blank PCBs that …

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Re: Market value for popular or rare classic computer hardware

Posted on 2023-10-12, 10:34

by

by feipoa

in Milliways

in Milliways

Here's another example of what may be falling prices for the nice, but not so hot, items. About year ago, these Lucky Star LS-486E rev.D boards were regularly selling for a little over $100, and from the same seller. This listing just sold for $41. Filename LSD.png File size 618.67 KiB Views 1053 …

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Re: Market value for popular or rare classic computer hardware

Posted on 2023-10-11, 19:43

by

by feipoa

in Milliways

in Milliways

IDT Winchip 2A sold for $160. Wow. Is the high selling point the large IDT logo, that is, rather than the more common (I think) WinChip logo? Or are the W2A chips with the giant WinChip logo just as expensive now? Winchip_2A.png wow as in "that seems low" or wow as in "still not actually worth it" …

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Re: Where to obtain 110 MHz RAMDAC for ARK1000VL graphics card?

Posted on 2023-10-10, 07:28

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

mkarcher, your response sheds a glimmer of hope. Would you be interested in working on such a VGA BIOS hack? I don't think many users here, myself included, would have to know-how for this sort of modification. I'd be able to do the testing once my 50 ns SOJ FPM DRAM arrives.

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Re: Market value for popular or rare classic computer hardware

Posted on 2023-10-09, 08:56

by

by feipoa

in Milliways

in Milliways

IDT Winchip 2A sold for $160. Wow. Is the high selling point the large IDT logo, that is, rather than the more common (I think) WinChip logo? Or are the W2A chips with the giant WinChip logo just as expensive now? Filename Winchip_2A.png File size 291.47 KiB Views 1284 views

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Re: Where to obtain 110 MHz RAMDAC for ARK1000VL graphics card?

Posted on 2023-10-09, 07:01

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My Umax Astra 600S was the best scanner I ever had. It was SCSI and kept working up until about 5 years ago. WJG, just make sure that text-only pages are scanned in 1-bit, or black/white (not greyscale). You might need to play with the threshold in the beginning to get it just right. Is there any …

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Re: Where to obtain 110 MHz RAMDAC for ARK1000VL graphics card?

Posted on 2023-10-09, 00:20

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

WJG, if you do scan it, are you able to do it in 1-bit so that the PDF is small enough to attach and so that it will print well? 300-400 dpi is probably sufficient. See the example I included earlier. mkarcher, I received a PM about trying to force this ARK1000VL card into 1024x768x64K mode at 56-60 …

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Re: Market value for popular or rare classic computer hardware

Posted on 2023-10-08, 09:40

by

by feipoa

in Milliways

in Milliways

By mentally subtracting the outliers and following more common sale values. If you fill up your eBay watch list or saved searches, not necessarily because you want that item, but perhaps because you already own the item and want to track its value, you can witness some general price trends for that …

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Re: Market value for popular or rare classic computer hardware

Posted on 2023-10-08, 01:03

by

by feipoa

in Milliways

in Milliways

BitWrangler wrote on 2023-10-07, 22:37: is hardly a trend though. Quite a few items have been selling for less than I expected, I just didn't post them here. They are usually the middle ground items, not necessarily the most in-demand.

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Re: Market value for popular or rare classic computer hardware

Posted on 2023-10-07, 22:06

by

by feipoa

in Milliways

in Milliways

Kingston 286 to 386SX upgrade. I have one of these but couldn't get it working. This unit sold for only $88. Are prices starting to come down? Filename 286_to_386SX_upgrade.png File size 497.66 KiB Views 1447 views

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Re: Where to obtain 110 MHz RAMDAC for ARK1000VL graphics card?

Posted on 2023-10-05, 18:59

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The LCD image shown above, which corresponded to R2 and R3 both being populated with 4.7K, occurs immediately at system start-up. Sometimes the white background screen would flicker to a teal green colour, but it is off-white most of the time. The blackish noise on the sides changed in location and …

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Re: Where to obtain 110 MHz RAMDAC for ARK1000VL graphics card?

Posted on 2023-10-04, 10:32

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I tried the 4 possible combinations for R2 and R3, namely, R2, R3 open, 4.7K ------> default config 4.7K, 4.7K ------> garbage displayed (see image) 4.7K, open ------>blank screen, beeps open, open ------>blank screen, beeps IMG_2628.JPG Based on mkarcher's reply, I did not try any configuration …

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Re: Where to obtain 110 MHz RAMDAC for ARK1000VL graphics card?

Posted on 2023-10-04, 00:59

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you very much for this level of detail. I'm sure others appreciate it as well. I will look into R2 and R3. If the configuration strapping has an internal pull-up (like 10K ) to set 80 MHz DAC mode, wouldn't we want this strap to go to GND via a 0-ohm resistor, or at least some resistor value …

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Re: Where to obtain 110 MHz RAMDAC for ARK1000VL graphics card?

Posted on 2023-10-03, 10:48

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Success! I'm impressed with mkarcher's ability to view a 1 second video clip of a jittery image and determine the issue was too low of memory clock. A combination of factors were required for 1280x1024x256c to be realised: faster MCLK, faster FPM DRAM, faster RAMDAC, and a modified VGA BIOS. A 65 …

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Re: Where to obtain 110 MHz RAMDAC for ARK1000VL graphics card?

Posted on 2023-10-02, 11:42

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It is possible that the written claim for 1280x1024x256c-60Hz was made in error or was made correctly, but not properly tested. I'm hoping the statement was correct, just that there's something we're missing. I'm going to pull out another motherboard for testing rather than the M919 I've been using …

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Re: Where to obtain 110 MHz RAMDAC for ARK1000VL graphics card?

Posted on 2023-10-01, 22:40

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did you test whether the image gets stable at 1280x1024x256c @ 60Hz with 70MHz MCLK with my modified BIOS? I remember testing 70 MHz MCLK with 1280x1024x256c-60hz, but the jittery image was still present. No change in appearance. I thought I wrote about this, but looks like I forgot. Thus, I do not …

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