Re: DOS Hang on floppy boot

Posted on 2020-05-07, 23:04

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Could be the bad CPU or the motherboard is failing? May have to replace the cache chips also. If you got cache chips from china, that could be one of these issues of quality. Use different settings that is for WT CPU for your CPU otherwise get another CPU with WT instead? Cheers,

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Re: Industrial grade CompactFlash Recommendation

Posted on 2020-05-07, 14:17

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Transcend CF170 is MLC. CF200, CF300 and CF220 are SLC. Dos works best with any SLC based NAND SSDs. Cheers,

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Re: Bought these (retro) hardware today

Posted on 2020-05-06, 14:11

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Back in the day, one of local pc stores that I worked at and many stores around used those fat and short towers with those plastic rails, these were specially made so drives is not loose when installed. Cheers,

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

Posted on 2020-05-05, 23:25

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You still have the iso of the windows 10 install? I can switch between GPT/UEFI or CSM/legacy with a click in rufus usb creator utility. This what I do at work due to not enough usb sticks. Cheers,

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Re: Help Wanted: Identify old 486 motherboard

Posted on 2020-05-04, 22:29

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You have two leads touching like a knee-caps touching on one of these chipsets. Cheers,

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Re: Commodore PC-10 I XT 380000-01 board repair

Posted on 2020-05-04, 22:21

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

TTL and dram memory makes noise on the supply rails during high to low and low to high transients. You will need to replace all the missing bypass capacitors as minimum. The 2 layer boards are much harder to keep quiet as not enough bulk in power and ground rails. Also you will need to replace the …

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Re: Commodore PC-10 I XT 380000-01 board repair

Posted on 2020-05-04, 22:19

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

TTL and dram memory makes noise on the supply rails during high to low and low to high transients. You will need to replace all the missing bypass capacitors as minimum. The 2 layer boards are much harder to keep quiet as not enough bulk in power and ground rails. Cheers,

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Re: Commodore PC-10 I XT 380000-01 board repair

Posted on 2020-05-03, 22:56

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I had funny issue with atom board once and it was missing voltage input from power supply on motherboard. Please install 7905 regulator and see if that helps. Cheers,

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Re: Is dban a good drive test

Posted on 2020-05-03, 00:28

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Smart values obtained by some utilities. gsmartcontrol, my favorite and tiny program, non-sense details in seconds. Under one of tabs: comes with is 3 levels of checks, quick check surface , long check surface, and transport check, some hard drives has a trip sensor that get tripped if jarred hard …

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

Posted on 2020-05-03, 00:19

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Purchased Compaq Deskpro M boards, 386/33M and 486/66M processor boards, I/O board and EISA board. Need to research into making a power supply. From same seller, in same purchase LTE LITE 386/25E motherboard (complete), hopefully this fixes my LTE LITE 386/25e notebook. This would help as my first …

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

Posted on 2020-05-02, 01:49

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

X-clamp does work very well. What does them in is meltable thermal compound is applied too much during manufacture of xboxes and PS4 consoles and when this settles to certain thickess, squeezing out excess when hot enough but to a point APU couldn't melt all of it so compound stayed cold and hard, …

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Re: Commodore PC-10 I XT 380000-01 board repair

Posted on 2020-05-01, 01:59

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes get the 74LS02, make sure you are using correct one due to speed and LS, F etc? Are you getting -12V? Is power good go active or go low or high certain delay after voltage comes on? May need dual input scope to check. Make sure clocks are running. Some XT might be more advanced needs CMOS …

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Re: asus TX97-XE issue

Posted on 2020-05-01, 01:50

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This is PWM DC-DC regulator IC that sends out series of pulses through power mosfets to the two coils to generate voltages for the CPU voltages. Could be too early motherboard but I doubt that by then when I had a HX chipset Asus P/I equipped with dual tag support, rev 3.1 supported K6-2 with no …

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Re: Bought these (retro) hardware today

Posted on 2020-05-01, 01:37

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The wrong ones... :( I ordered them from Digikey, I did as much research before ordering but when I put them in the board this morning, I get a message saying “Bad Cache, do not enable Cache”... this was 32kx8 x8 + 1 extra for Tag. 256kb total. So the specs are the following... 9BA7AE8D-5628-41ED- …

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Re: Bought these (retro) hardware today

Posted on 2020-05-01, 01:31

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Got two Socket 5 motherboards to satisfy my long term interest in early Pentium chipsets. 1st the Gigabyte with UMC8891 chipset. I am really excited about that one as I was looking for one for some time. This is to debunk/confirm the myth that it is a scaled 486 design. DSC_6975.jpeg 2nd dual P90 …

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

Posted on 2020-04-30, 01:02

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did some maintenance work on the modded Xbox 360 (Falcon) I got lately. The previous owner already did some improvements to the cooling system, fortunately. I've added a heatsink to the HANA chip, replaced the thermal paste, fixed the GPU x-clamp fix (one washer was missing and the screws too loose …

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Re: asus TX97-XE issue

Posted on 2020-04-29, 23:03

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Similar eraseable flash rom capacity will work. I done hot swap thing, by booting with good bios then when powered carefully pull flash IC and put bad flash firmware in, and proceed with flashing utility. I did same way using a working motherboard to create updated firmware for a Spock SCSI MCA card …

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Re: Fault code 'LI' with Quantum Fireball TM

Posted on 2020-04-29, 23:00

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yay! When I had a hard drive that was not able to remove that odd boot sector, it was the windows and fdisk not doing correctly. Cheers,

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Re: Commodore PC-10 I XT 380000-01 board repair

Posted on 2020-04-29, 22:53

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

7905 is LM7905 regulator IC with 3 terminals. Drops -12V to -5V with some heat, used for ISA slots, audio card, serial ports and some specific cards use these -5V and -12V. For now, see if you -12V working first then install 7905 IC regulator. Do you have -12V supply working from your PSU? Cheers,

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Re: Asus A7V133 (KT133A + 686B) + AXP - Unusable = LOTS of CRC Errors

Posted on 2020-04-29, 22:48

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wow. Cheers,

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