Re: Bought these (retro) hardware today

Posted on 2023-05-01, 18:38

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes works and gives a nice firework. Dont know what all the LEDs mean. Also dont know about the PALs, my Minipro seems not to be able to read them. 20230430_223454.jpg 20230430_223450.jpg 20230430_223448.jpg 20230430_223446.jpg 20230430_223438.jpg @Predator99 i see.Do you have any back side …

---

Re: Bought these (retro) hardware today

Posted on 2023-05-01, 17:11

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

..and Apple II cards IMG_8250.jpg Strange mix but seems to be worth the money I paid... EDIT: The ROM on the POST-card will not do very much... DIAG-ROM.jpg There are some pal chips on that POST card.They might be protected though. Very good card.Does it work? Yes works and gives a nice firework. …

---

Re: Bought these (retro) hardware today

Posted on 2023-04-30, 16:54

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Predator99 wrote on 2023-04-28, 19:41: ..and Apple II cards […] Show full quote ..and Apple II cards IMG_8250.jpg Strange mix but seems to be worth the money I paid... EDIT: The ROM on the POST-card will not do very much... DIAG-ROM.jpg There are some pal chips on that POST card.They might be …

---

Re: Powecom UPS Troubleshooting/Repair

Posted on 2022-10-12, 13:04

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is mosfet group 1 output to transformer: Filename 6.jpg File size 120.29 KiB Views 121 views Filename 7.jpg File size 126.34 KiB Views 122 views Here is mosfet group 2 output to transformer: Filename 8.jpg File size 124.98 KiB Views 122 views Here is output of UPS: Filename 9.jpg File size 134 …

---

Powecom UPS Troubleshooting/Repair

Posted on 2022-10-12, 13:03

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, Recently i got an Powercom UPS from local scrapyard with unknown condition. Before powering it i removed case and inspected UPS for faults. I figured out that lead acid batteries are long gone but main PCB and transformer was looking fine. 1.jpg 2.jpg My UPS seems an ancient model that i …

---

Re: Documentation Hunt -- Micro/Sys Motherboard and Graphics Card, Ampro Little Board Motherboard

Posted on 2022-10-12, 09:51

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, Could you please check attached pdf for LB? 5001031.pdf Unfortunately you are out of luck about Micro/Sys boards. https://web.archive.org/web/20000304180553/http://www.embeddedsys.com/html/i_o_expansion.html https://web.archive.org/web/19980212180237/http://www.embeddedsys.com/html/sbc3386.html …

---

Re: Any chance repairing 128MB FPM-SIMMS with parity?

Posted on 2022-08-30, 17:57

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I had a similiar issue with my 4 mb FPM SIMM with parity, it fails on memory test. Removed parity chips and tested it but no luck, then i searched online for testing chips one by one with arduino and found that some people are checking simm modules with arduino. I will try to code something like …

---

Re: OAK OTI-077 Graphics Card Ram Retrofit

Posted on 2022-08-15, 08:17

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@horun Thanks for reply. I have never tested with 4 chips but will try and post results. @pentiumspeed Thanks for datasheet. 2x16 Bitx512k FPM DRAM idea is nice. If i could find two 512k chips. In datasheet there are no pinout for this chip sadly. It says "pinout is same as OTI-067 databook" or …

---

OAK OTI-077 Graphics Card Ram Retrofit

Posted on 2022-08-12, 14:08

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Recently i got myself an OAK OTI-077 ISA Graphics card from a local scrapyard about 2$. The card was mostly OK in physcial condition with one RAM chip missing and 3 Pins damaged in total. I have soldered back damaged pins and plugged it with one RAM chip missing just to see if any outputs that card …

---

Re: PC420-G2 Single board computer manual and Troubleshooting

Posted on 2022-01-27, 05:30

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes this was the thing i have been looking for quite sone time. Could you please share bios BackUp?

---

Re: PC420-G2 Single board computer manual and Troubleshooting

Posted on 2022-01-26, 19:11

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi Whitepawn, I have the same SBC. Have you figured out how to connect the HDD LED, POWER LED and RESET button? I can't find any documentation on this thing. Hi Eric, Does your board same hardware revision?A picture of board will be very good if possible. Here is the CPU jumper settings that i …

---

Nec V40 8088 System With SRAM question

Posted on 2021-11-03, 19:49

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Today i went to a local scrapyard and bought this motherboard (?) thing: IMG_20211103_222058.jpg IMG_20211103_222110.jpg At first i was intended to buy only for FPM-EDO ram in first sight and i didn't care to check if it is really 72pin ram.Seller was not selling only ram stick and it was dirty …

---

Re: SBC 486 DX4-100

Posted on 2021-10-21, 15:56

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@vmswift Many many thanks for the manual.I have tested these jumper settings on my PC420-G2.It works fine https://www.vogons.org/viewtopic.php?f=46&t=80048 I assume user manual have 6 pages could you please provide missing pages also?Or PDF scan will be very nice if possible. Could you please also …

---

Re: FIC 486-PVT Ram issue

Posted on 2021-09-24, 17:40

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi again after long time. I bought FPM RAM and POST card, tested motherboard it posts fine with FPM RAM but it freezes with 0F0E bios code which seems "DMA page register initialization" according to post card manual. I assumed it is related with i/o card so i tested it with 2 different i/o cards ( …

---

Re: Lanner Electronics AP-4100AA 486 Troubleshooting D3 Post Code

Posted on 2021-08-09, 20:50

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Many thanks for info.I have just bought FPM RAM and board booted fine so as you described EDO RAM was the problem. Thanks again!

---

Re: Lanner Electronics AP-4100AA 486 Troubleshooting D3 Post Code

Posted on 2021-08-02, 16:50

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Many thanks for reply. I see, but unfortunately i don't have FPM memory right now.According to this auction link https://www.ebay.ca/itm/223554800087 it can boot with EDO i assume but i am not sure if this is EDO.Another thing i noticed BIOS sticker is different than mine.Is it possible to add EDO …

---

Lanner Electronics AP-4100AA 486 Troubleshooting D3 Post Code

Posted on 2021-08-02, 12:43

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have just bought Half size SBC from local scrapyard.Board name is Lanner electronics AP-4100AA V1.3 attached picture of board above: rsz_img_20210801_145137.jpg First i cleaned board and tested cache chips with my TL866ii Plus, cache chips tested fine.Then i inspected board for any physical damage …

---

Re: 486 CPU Heatsink Removal and Identification Am486

Posted on 2021-07-31, 20:39

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Many thanks for input Deksor. I will try your suggestions and will post results.

---

486 CPU Heatsink Removal and Identification Am486

Posted on 2021-07-31, 18:55

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I Recently bought 3 486 cpus from local scrapyard which can be seen below: 1627756969028.jpg rsz_1627756968991.jpg I have 3 questions about them: 1)One of them (Left one) is glued to heatsink as seen with some kind of epoxy i believe.Is it possible to remove heatsink from CPU without damaging …

---

Re: 486 motherboard CPU voltage issue

Posted on 2021-07-21, 14:31

by

by whitepawn

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Watched youtube video good job, I didn't get bored while watching so don't criticize yourself. Here is full manual i believe:(Your hard copy has missing pages.)Also attached to post. https://www.elhvb.com/webhq/models/486pci/m921.htm I also liked your CPU testing SIS 486G board that you repaired …

---