Re: DigiPOS adventures!
Posted on 2023-01-19, 11:28
Yes, the 5v supply on the PicoPSU is substantially lower than the 12v supply. I guess I'm pretty close to the limit.
Re: DigiPOS adventures!
Posted on 2023-01-18, 23:32
I believe it's either an 80w or 90w rating, of course that's likely to be a peak rating, and who knows whether the 12v power brick feeding it is still up to the task. It's easy enough test, as I'll just temporarily plug a full ATX PSU into the header and see if the reboots/brownouts go away.
Re: DigiPOS adventures!
Posted on 2023-01-18, 22:36
Okay, it is working; both in single and split-voltage modes - the issue is the processor socket itself. What I've realised is that because of the space constraints of this motherboard and chassis, what they've done is use the base part of a ZIF socket, and then altered it so that the upper section …
Re: DigiPOS adventures!
Posted on 2023-01-18, 20:59
Hmm... think I may have killed it! Took the processor back out and started measuring voltages on the socket. With 2.8v / dual voltage settings jumpered, I can indeed get 2.8v on VCC2 pins.... but wherever I measure VCC3, it only shows 0.9v. Jumpered back for the Winchip (single voltage, 3.52v) both …
Re: DigiPOS adventures!
Posted on 2023-01-18, 13:32
Trying to now get a P200 MMX working in this system. It doesn't specifically list MMX support, but it has onboard voltage regulators as well as listed support for the Cyrix 6x86L which has the same split voltage specifications (2.8v / 3.3v) as the P55C. The motherboard manual lists this: cpu_jumpers …
Re: Sunlogix 80386-33/40 (Micro Express Computer) - Config Questions now
Posted on 2023-01-17, 10:59
Have you tried using UNISOUND to set your volume? It should be able to set it across pretty much all of your sound cards. Not sure if it would make a difference, but it's worth a try - at the very least it's a nice all-in-one sound config utility that works with the majority of DOS sound cards.
Re: NEC PC-9821An: My crazy Japanese Socket 5 machine
Posted on 2023-01-16, 21:35
The most compatible extender I found was dpmi.exe as included in NEC MS-DOS 6.22. the other extenders appeared to work but didn't support the dpmi calls that djgpp used when the code actually was loaded at runtime - at least those I use to allocate the far pointers and segments needed to map the …
Re: NEC PC-9821An: My crazy Japanese Socket 5 machine
Posted on 2023-01-16, 20:58
That's really useful, thanks. My main targets will probably be a MPU midi output (and I see there's a driver linked on of those pages above for the Roland type midi interfaces), as well as FM playback of midi files and simple 1 voice pcm (lowest common denominator for almost all the platforms).
Re: NEC PC-9821An: My crazy Japanese Socket 5 machine
Posted on 2023-01-16, 20:38
What I have struggled to find is anything on the sound hardware. I'm writing an RPG engine and I'd like to target the PC98 (alongside Dos, SDL, Sharp X68000 and MSX2) but at present I can't find any details on sound APIs for it.
Re: NEC PC-9821An: My crazy Japanese Socket 5 machine
Posted on 2023-01-16, 20:36
I've only just started using Dosbox-X myself, I would be interested in testing it out for PC98 at some point. I did file a bug report with the np21kai Dev on GitHub as the behaviour of the PEGC linear framebuffer in the emulator didn't match that of the real hardware when tested. Basically, if the …
Re: NEC PC-9821An: My crazy Japanese Socket 5 machine
Posted on 2023-01-16, 20:03
One of these days I need to reverse engineer the PC98 djgpp patch and apply it to a clean source tree so that I can run the whole thing as a native cross compiler under Linux, rather than getting the old djgpp compiler to run under emulation.
Re: NEC PC-9821An: My crazy Japanese Socket 5 machine
Posted on 2023-01-16, 20:01
Mine came with an S3 928 powered windows accelerator C-Bus card (which Ive never used as it wa always intended to be a DOS/programming toy and I've since added a SCSI controller (with the aforementioned Exide rom) as well a Roland MPU401 card. I do most of my development using djgpp under Dosbox and …
Re: Digital Venturis FX5150s
Posted on 2023-01-16, 19:25
I've got the bigger brother to this, a Venturis GL 6200. It's pretty much the same case, and same 'split' upper/lower motherboard layout, same S3 Trio onboard VGA, same slot layout etc. The difference is the GL 200 has a Pentium Pro 200, and I think there was a model with dual PPro as there's empty …
Re: NEC PC-9821An: My crazy Japanese Socket 5 machine
Posted on 2023-01-16, 18:36
Also... Cossie fan?
Re: NEC PC-9821An: My crazy Japanese Socket 5 machine
Posted on 2023-01-16, 18:31
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
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
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
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
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
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 …
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