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Re: NEC PC-9821An: My crazy Japanese Socket 5 machine

Posted on 2023-01-16, 18:31

in Marvin \ System Specs

in Marvin \ System Specs

If you are interested, I have the same machine and documented how to enable large disk support using an modified IDE bios (similar to XT-IDE). https://www.target-earth.net/wiki/doku.php?id=blog:pc98_hdd I've also done some programming on the PC9821, including documenting how to acces and programme …

Re: Tulip Vision Line DT 5/166 - disable built in ethernet/replacement floppy

Posted on 2023-01-15, 13:03

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Finally got around to benchmarking this system. It's a good, solid performer, perhaps let down a little by the 72pin SIMM memory implementation (rather than the optional SDRAM interface of some 430VX implementations): visionline_dt5166.png In particular I'm very impressed by the compact flash …

Re: PSA: Please open and inspect your surge protectors and power centers\controllers... today.

Posted on 2023-01-15, 10:53

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've never seen anything like that, but I'm in the UK where our mains wiring, mains switches are significantly more sturdy than most. I'm guessing at it's function - does that give you power on/off control for a set of AC sockets at the back there? Yes, these were actually fairly common in the US …

Re: How to boot from a SCSI CD-Drive?

Posted on 2023-01-14, 10:10

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Usually if the SCSI controller is built in, then you will have options like A, C, SCSI as boot options in the bios. For add-on cards, you often has to go into the adapter BIOS itself (Adapt c cards were Control-A or Control-H If I recall?) After the POST test to enable boot support.

Re: PSA: Please open and inspect your surge protectors and power centers\controllers... today.

Posted on 2023-01-14, 09:41

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've never seen anything like that, but I'm in the UK where our mains wiring, mains switches are significantly more sturdy than most. I'm guessing at it's function - does that give you power on/off control for a set of AC sockets at the back there?

Re: VLB video card memory

Posted on 2023-01-13, 23:55

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As mkarcher says, additional memory can be used for offscreen objects, virtual resolution, triple buffering etc. I don't know how many games/applications took advantage of that, but in vesa modes (especially 2.0 lfb modes) its trivial to do, so I'm surprised more games didn't optionally take …

Re: 386 with 4GB?

Posted on 2023-01-13, 15:41

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

rasz_pl wrote on 2023-01-13, 01:39: :] TLDR: there is nothing that would run well on a 386 and require more than 8MB of ram. Same deal with 486 and ~12MB of ram. That's quite a statement to make. You know every single use case of a computer with a 386 during its production run, of course, yes?

Re: 386 with 4GB?

Posted on 2023-01-12, 09:36

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Anything attached to the ISA bus is going to be (at least) several times slower than even a 386SX main memory access speeds - most will struggle to get more than single-digit IDE transfer speeds.... that's even with modern IDE drives with their large caches. It would crawl. A VLB IDE controller may …

Re: what do you think is the best 440bx mainboard in the world?

Posted on 2023-01-12, 09:25

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I used a Gigabyte GA-6BXD with dual P3-450's as my main system for many years. It was rock solid. The customisation options/overclocking ability (or lack of ) may not place it as other peoples 'best', but for me, as my only computer (dual booting Linux and Windows 2000) from 1999-2003 (ish) it was …

Re: Riser cards as backplanes for single board computers

Posted on 2023-01-12, 09:18

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah - that 'shoebox' formfactor is exactly the sort of thing I am looking to achieve. Great stuff! Did you 3d print the IO bracket holder or did you find a supplier?

Re: AspringNobody's PCM-Wavetable Module Thread

Posted on 2023-01-11, 13:46

in Marvin \ Sound

in Marvin \ Sound

I'm really liking those randomizer examples!

Riser cards as backplanes for single board computers

Posted on 2023-01-11, 11:45

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have a hankering for building an ultra tiny 386 with one of those everything-on-a-16bit-isa-card sbc's (PC/104 is nice, but ISA is really convenient). Most come with video , but some don't, and I'd want to add audio too - that means a total of 2-3 ISA slots. That's just the right amount that you …

Re: Cache not working on 386 mobo

Posted on 2023-01-11, 11:39

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does cachechk report anything suspicious?

Re: BIOS programming

Posted on 2023-01-10, 18:52

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've just used my TL866 to flash a SST29EE010 bios this week. I use the Linux software, minipro, but the Windows application should work fine Make sure that if you buy a TL866 that it comes with the PLCC32 adapter (most bundles include at least that along with several more). Other than that, it's a …

Re: DigiPOS adventures!

Posted on 2023-01-10, 15:47

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Think about ROM access speeds (=>100ns), across the ISA bus (~8MHz, 8/16bit), compared to main memory (<100ns, 16/32bit, whatever transfer speed your memory is at). I've done quite a bit of testing, including the benchmarks here for my FIC 386-SC: https://www.target-earth.net/wiki/doku.php?id=blog: …

Re: DigiPOS adventures!

Posted on 2023-01-10, 09:46

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PicoPSU is fitted and working. I re-used the original AT power switch wired to the PS_ON/+5VSB headers on the ATX breakout board I fitted the PicoPSU to (easier than cutting up an ATX power cable/crimping a load of wires). It's gotten rid of that nasty little 40mm PSU fan, quietened the overall …

Re: DigiPOS adventures!

Posted on 2023-01-10, 08:16

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's all about ISA clock (I can damn near run it at 14MHz stably on that system) and ensuring that you copy the XT-IDE rom to ram - if you're using an IDE rom replacement of course (otherwise any bios based disk access has to go over the ISA bus to access the routines in the ROM chip)! No such …

Re: VGA Capture Thread

Posted on 2023-01-09, 23:49

in Marvin \ Video

in Marvin \ Video

I have been using my Magewell HDMI Pro Capture for a while now and it has worked well with everything and every system thrown at it (via OSSC), but I just discovered recently that it really doesn't like the '70Hz' modes of a Matrox Millennium II. Those are modes like when running Speedsys, Doom, …

Re: DigiPOS adventures!

Posted on 2023-01-09, 20:39

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That does seem a tad slow. I get 1800 kB/s on my 486 with VLB I/O card. Tell me about it; on my FIC-386SC (with 486 DLC-40) I can hit 3Mbytes/sec with the same type of card (Sandisk 16GB Ultra), CF reader and a bog standard ISA multi-io card (that's with the XT-IDE rom shadowed). On a 286 with a …

Re: Opinions on floppy drive without cast aluminum frame?

Posted on 2023-01-09, 13:36

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The big plus of later floppy drives is that they almost exclusively went to direct drive motors == no more belts to replace!

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