Search \ VOGONS

Login

Login

Username

Password

2FA token (optional)

Remember me

Hide my online status this session

Lost password
Send activation email

or Create a new account
Create a new account

Common searches

Active topics

Search results

Display options

Re: 3 (+3 more) retro battle stations

Posted on 2023-06-20, 16:32

in Marvin \ System Specs

in Marvin \ System Specs

Didn't bother with 256Kb. When i was examining these boards the objective was to max-them-out in all ways and see where the boundary is. So it had to be 1Mb level 2 cache buffer. I am sure 256Kb will be more stable, but that's not very interesting (to me at least). Thanks for the photos of the mod. …

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-20, 16:13

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@weedeewee Yes to all your questions. To confirm to your first question - the output is constant.

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-20, 16:13

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@pentiumspeed So, can you expand on your note please ? Do you mean issues with serial ports, or something broader ? As a side note - these controllers, along with Promise EIDE Pro (ISA), are probably the best i touched so far. They are normal controllers really - handle both serial wiring standards, …

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-20, 15:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Pin 3 is silent too. Picture of the controllers i am testing with. Tested with other models as well - UMC and GoldStar based ones - same result with the mouse on this mobo. I use these because they handle very high ISA frequencies fine, especially the green one. No such chips on them.

Re: Need an adaptor to turn a PLCC-68 female socket into a PGA-68 female socket?

Posted on 2023-06-20, 07:34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

https://www.aprilog.com This company can assemble you such thing. They take any requests for assemblies, as far as i know.

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-19, 23:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Signal on ISA pin 22 changes with FDD-copy. However Serial pin 2 is constant when outputting from terminal.

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-19, 21:30

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I do have oscilloscope. Can run a fdd-copy test and observe B22. Will post the result later today.

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-19, 21:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I ordered the female end and will assemble such dongle. My point was that without it i was not sure if this test is even meaningful. Thanks for confirming that.

Re: 3 (+3 more) retro battle stations

Posted on 2023-06-19, 21:26

in Marvin \ System Specs

in Marvin \ System Specs

@Feipoa Fixed the original post. I meant level 2 cache, but not level 1. Good catch. As for modifying the Chaintech 486SPM motherboard - during testing i was warm on the idea, but list interest soon after that. That assembly didn't impress, so motivation was not there. Maybe at some point later. --- …

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-19, 20:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The voltage on these pins is ~4.8. This is what the PSU passes down to the mobo. In case you forgot me response above - i test with ATX+AT adapter and AT power supplies. The AT power supplies provides ~5V, the ATX+AT provide 4.8V. In both cases the outcome in terms of serial ports malfunction is the …

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-19, 20:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Forgot to respond to the CheckIt3 test status request. Everything comes clean. But the serial ports test looks like this. Result is the same when run the test on computers where the serial ports work (with the same controller), so not sure how indicative this test is.

Re: 486 board with UMC 8881E/8886B: The winner is: EDO without L2 (if your only other option is L2 at 3-2-2-2)

Posted on 2023-06-19, 06:59

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Missed that line. Ok, so you are seeing the same thing. Too bad. The 60/66MHz 3222 1Mb config is actually slower than 256Kb at 2111, which kind of defeats the point. At 50MHz 2111 should be possible with the 1Mb buffer. I can do it here. Feels like unlucky chips you got. In general all chips must be …

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-19, 06:47

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The EPROM was freshly burned. Checked these pins - they are all good. Just some crusty bits, not that bad really - looks worse on the pic than actually is.

Re: 486 board with UMC 8881E/8886B: The winner is: EDO without L2 (if your only other option is L2 at 3-2-2-2)

Posted on 2023-06-19, 01:44

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

yes, i had to swap bunch of chips around for 2111 at 40/50. keep in mind i have the dram wait states to 0 at these freqs. Mkarcher, when you can try 60/66 ? really curious if you will be able to hit 2111.

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-19, 01:40

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

yes of course i tried the sound. but testing is with vga and ide controllers only. tried trident 8900cl, stb nitro (cl 5434), et4000ax.

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-18, 23:26

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

yeah, it is such a weird problem. everything else checks out, with video, sound and ide. thats why reached to you guys for ideas. all feedback is well appreciated. there are some clear steps i will take to narrow it down further. th bus mouse option sounds like the low-friction entry point tho. …

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-18, 21:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

deunan, if you have an app like that i will take it.

Re: serial mouse not detected on a 386 motherboard

Posted on 2023-06-18, 21:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

yes, of course. tried with the /S## flag all possible coonfigurations that match the controller card jumpers.

Re: 486 board with UMC 8881E/8886B: The winner is: EDO without L2 (if your only other option is L2 at 3-2-2-2)

Posted on 2023-06-18, 21:25

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

i tried only 1mb buffer

Re: 486 board with UMC 8881E/8886B: The winner is: EDO without L2 (if your only other option is L2 at 3-2-2-2)

Posted on 2023-06-18, 19:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

several years ago i strapped 1024kb L2 cache on the UUD board. was able to get it to 2111 at 40 and 50 mhz fsb. tried veey hard to achieve the same at 60/66 but without success. only 3222 was fully stable. used trusted chips that do it on SiS based boards, but the UUD guy didnt want to play along. …

Page 16 of 98

Go to top of page Go to top of page