Re: How does one setup booting from LAN exactly?
Posted on 2020-11-26, 02:12
Doesn't one of the variants of XT-IDE BIOS support booting over a serial port?
Re: Recommendation 386-k6-3 era motherboards that are compatible with modern cases?
Posted on 2020-11-26, 02:10
If you have a full ATX case you should be able to fit a Baby AT motherboard in it with two complications: You'll either need to do without an I/O shield, try and find a premade one, drill a hole for the keyboard port in a blank one, or 3D print one Because AT cases had 8 slots, and ATX has 7, you'll …
Re: How to slow down NEC V20?
Posted on 2020-11-26, 01:55
Hi! Thanks a lot for all of your help and sorry for the delay. - I've wanted to program a new EPROM (2764 ?) and try it in my XT first, before posting back.. But unfortunately, I was totally busy because of a birthday party, so I hadn't been able to post back. Anyway, I think I can try it in the …
Re: 3d printed Heatsink&Fan Mount for Socket 3/5/7 ?
Posted on 2020-11-22, 01:56
Well take a look at my icon. I'm using an ATS BGA heatsink (45mmx45mm) along with a custom 3d printed bracket I made for it to clip onto.
Re: How to slow down NEC V20?
Posted on 2020-11-22, 01:55
Jo22 wrote on 2020-11-13, 09:53: Thanks for the information! 😀 Did you get anywhere with this?
Re: Jumpers for 586-160Mhz? (plus how to get DOS to boot with it...)
Posted on 2020-11-21, 04:04
Oh also, I'll add to double check your jumpers and make sure you didn't mess up anything with regard to the Am5x86-133 being a write-back SL-enhanced CPU.
Re: Jumpers for 586-160Mhz? (plus how to get DOS to boot with it...)
Posted on 2020-11-21, 04:03
Hello! I'm also running two Am5x86-133s at 160. They were not stable with the 3.3 V setting on the board. I never actually tried disabling L1 though (which will make it slower than it is at 133). What I did have to do is increase the voltage. Technically the Am5x86 datasheet I'm reading says 3.3V …
Re: Compact Flash and Bios Shadowing (Micronics DXLB/Gateway2k 486DX2V)
Posted on 2020-11-16, 00:45
It isn't clear with the CF whether the bios locks up and won't boot at all or if you can still boot from floppy. In any case you could boot from a DOS disk with debug on it (e.g. DOS 6.22 disk 1) and compare the location of the FDPT in the four combinations (CF vs. HDD & shadowed or not). To dump …
Re: My First 486 Build!
Posted on 2020-11-15, 03:50
Between the board+RAM+CPU and Trident VGA card you at least have enough to make sure it's working. Be super careful with the power supply. The loose wires visible in the third picture are supposed to go to a power switch. Those wires carry 120VAC/240VAC. For connecting the two PSU connectors to the …
Re: Biostar MB-8433UUD 2.0 Issues
Posted on 2020-11-15, 03:32
If replacing the super i/o didn't work for @Feipoa and me, I wonder what else talks to the floppy drive ? Could it be the UM8667 that is messing things up ? All traces from the floppy connector go to either GND, a resistor array or to the super IO chip. I don't see anything else. Traces on my …
Re: How to slow down NEC V20?
Posted on 2020-11-15, 01:54
By the way Jake, could you explain how you were able to identify the checksum routine? You can tell from this code that it's adding up every byte from f000:c000 through f000:fffe and comparing it with the byte stored at f000:ffff; if it doesn't match, it does a hlt (interesting that it doesn't do …
Re: How to slow down NEC V20?
Posted on 2020-11-14, 04:25
Thanks! :cool: Hi Interestingly your BIOS also runs into a "PIT1 ERR" when run under PCem. I'm able to patch out that check, as well as several others, and can then get it to boot in PCem. I assume you can break out your hex editor and you have a way to program a new BIOS chip for the machine. …
Re: Compact Flash and Bios Shadowing (Micronics DXLB/Gateway2k 486DX2V)
Posted on 2020-11-14, 03:44
Both problems seem bizarre. Could you show the screen where you set the hard drive info. Is it possible that the 350MB disk is one of the "known" types in the BIOS (1 through 46) while the 512MB disk requires user type (type 47). I remember reading something about the BIOS needing a place to store …
Re: Which 486 board
Posted on 2020-11-10, 16:14
A question: did you have modified my uploaded BIOS Image ? If yes, you're damn fast :-) I have compared my and your modified BIOS image.. only 42 byte is changed My board had the same BIOS that I modified. The only difference is to set up some of the chipset registers the way that the M912 BIOS …
Re: Which 486 board
Posted on 2020-11-09, 17:15
It help ! Thanks 5x86 WB run stable , but a bit less performance than old BIOS in WB Mode. Win98SE stable, DOSbench stable, no freeze. A interessing notice: CPU type DX4 and 5x86 is dected as DX2-100 Greetings matt If you haven't already you may want to go into the bios setup and disable autoconfig …
Re: Which 486 board
Posted on 2020-11-08, 22:34
Here a bios image of my board. It doesn't know 5x86, it runs (not so) good in WB-mode. (Win98SE crashed, if 5x86 is jumpered as P24D , it run stable with P24C stetting) Here's the hacked version. I wonder if it will help yours work in WB mode as it did mine. I also had stability problems, but for …
Re: Struggling to format a 2 GB SD card (in an IDE-SD adapter) to full capacity
Posted on 2020-11-08, 01:56
If your IDE to SD adapter uses an FC1307 chip and the first primary partition you are creating is FAT12 or FAT16, it will never work . See https://www.vogons.org/viewtopic.php?p=899361#p899361 A workaround would be to create a small FAT32 or NTFS primary partition as the first partition and then …
Re: Struggling to format a 2 GB SD card (in an IDE-SD adapter) to full capacity
Posted on 2020-11-08, 01:07
Reporting the correct C/H/S is one thing, supporting them is another. There is 99.9% chance that your BIOS can't work with anything larger than 512MB, or 1024/16/63 Thank you, that explains it. Also I suspect that this BIOS format you ran is the low level format. Just use some DDO software like EZ- …
Re: Another 486 no-POST
Posted on 2020-11-08, 01:02
No idea on the hardware side but here's what those BIOS screens look like if it helps any.
Re: Socket3 (ECS?) UM4980 Mobo won't detect CF2IDE
Posted on 2020-11-05, 06:09
A little bit of googling and I came to the model name/number of my second Socket3 board, apparently "DX-6900 or 80486 Deep Green". That board is also known as an M912 and I've found it to be a good one. So the CL-GD5426 has no jumper information whatsoever, not even on the back? I see the IDE chip …
Page 4 of 26