Cool. Thanks.
It can be the FPU here really, since it does not work in 2-3 different 8086 mobos.

pshipkov wrote on 2024-02-18, 05:19:

Cool. Thanks.
It can be the FPU here really, since it does not work in 2-3 different 8086 mobos.

You need the FPU made for the NEC V30HL >> the "NEC D9008D 16mhz (8087 compatible) FPU"

aazard wrote on 2024-08-13, 01:12:

You need the FPU made for the NEC V30HL >> the "NEC D9008D 16mhz (8087 compatible) FPU" […]
Show full quote

pshipkov wrote on 2024-02-18, 05:19:

Cool. Thanks.
It can be the FPU here really, since it does not work in 2-3 different 8086 mobos.

You need the FPU made for the NEC V30HL >> the "NEC D9008D 16mhz (8087 compatible) FPU"

It did end up working for you as well?

Paralel wrote on 2024-08-13, 01:25:

aazard wrote on 2024-08-13, 01:12:

You need the FPU made for the NEC V30HL >> the "NEC D9008D 16mhz (8087 compatible) FPU" […]
Show full quote

pshipkov wrote on 2024-02-18, 05:19:

Cool. Thanks.
It can be the FPU here really, since it does not work in 2-3 different 8086 mobos.

You need the FPU made for the NEC V30HL >> the "NEC D9008D 16mhz (8087 compatible) FPU"

It did end up working for you as well?

Not in a Tandy (I dont have one currently), but yes in a AT&T 6300

These don't work on anything i tried so far. Including Tandy 1000SL.
Unless my chip is toast.

pshipkov wrote on 2024-08-15, 23:51:

These don't work on anything i tried so far. Including Tandy 1000SL.
Unless my chip is toast.

you have the correct NEC FPU?
did you test the socket's signals itself?
I have seen it in an AT&T 6300, I believe its full clock is 16.66mhz with 50mhz oscillator, I believe some people have used them up to 20mhz successfully (in 6300's and M24's) with 60mhz oscillator, from way back stuff.

Anyhow, with EMU386, I think you'll beat "most" 386SX's of equal clock, even sans an FPU, in "real world use"
Try my found & posted updated GEOS.GEO kernel for New Deal Office 2000:
https://archive.org/details/geos_20240815

Results should be STUNNING, also an ATI Mach32 Graphics Ultra Plus 2mb will run in a 8-bit isa slot ("fastest" possible, in an XT...sorry for run on adds)

///

Notably: READ THIS 1ST ONE, ABSORB, SERIOUSLY!

"So, I re-compiled latest FreeGEOS kernel with 32-bit support off and dropped it into NewDeal Office 2000 install. It boots and it works, there is SSL and HTML4 in the browser, and there's PDF that supports PDF 1.0-1.3 and then some. It works with acceptable speed, in fact."

&

"Nice bonus: even if MediaViewer doesn't seem to support JPEG files, they can be opened in browser. It is a very big deal for a 286 machine"

Found at:
https://tech.lgbt/@nina_kali_nina/111653827347219206
Running on a 80286, 100% tested to work on a V30

We are talking D9008D, so yes - that FPU. : )
But not sure what to make out of the info in the link you provided. Can you clarify please ?

Do you have it up and running now, or sharing memories from the distant past ?

M24 is trouble to get it on an out of specs OCing extravaganza.
Never tried or even heard until your post about ATT 6300, going to read on it soon.
The scalable 8086 hardware didnt like the NEC FPU here, so far.

pshipkov wrote on 2024-08-15, 23:51:

These don't work on anything i tried so far. Including Tandy 1000SL.
Unless my chip is toast.

If it fails in multiple machines, I'd think that is a strong vote for a straight up dead chip.

Is there any datasheet available for that D9008D chip?
I'm especially interested about the CLK duty cycle requeirement - it's different between 8088/8086 and V20/V30...

No info online it seems.
—-
Thats why i mentioned early that good chance my chip is toast.

aazard wrote on 2024-08-16, 00:32:

I have seen it in an AT&T 6300, I believe its full clock is 16.66mhz with 50mhz oscillator, I believe some people have used them up to 20mhz successfully (in 6300's and M24's) with 60mhz oscillator, from way back stuff.

Wait... Is that just the math coprocessor you're talking about? Or did people get the whole combination to run in an M24/6300 at 16 or 20MHz, including the V30 CPU?

Could you link to that information, maybe? Thanks!

digger wrote on 2024-08-17, 11:10:

aazard wrote on 2024-08-16, 00:32:

I have seen it in an AT&T 6300, I believe its full clock is 16.66mhz with 50mhz oscillator, I believe some people have used them up to 20mhz successfully (in 6300's and M24's) with 60mhz oscillator, from way back stuff.

Wait... Is that just the math coprocessor you're talking about? Or did people get the whole combination to run in an M24/6300 at 16 or 20MHz, including the V30 CPU?

Could you link to that information, maybe? Thanks!

Let me dig it up, I know I read the 16/16 combo as working, some guy has a yt vid of installation/setup

That will be interesting because it opens the door for further overclocking.
I have Tandy 1000SL ticking at 17.13MHz with 16MHz rated NEC V30HL CPU and selected Intel made 10MHz rated FPU.
V30HL chips can hit 20MHz no problem in specific XT mobos, but the Intel FPUs really struggle past 14MHz.

aazard wrote on 2024-08-20, 17:00:

digger wrote on 2024-08-17, 11:10:

aazard wrote on 2024-08-16, 00:32:

I have seen it in an AT&T 6300, I believe its full clock is 16.66mhz with 50mhz oscillator, I believe some people have used them up to 20mhz successfully (in 6300's and M24's) with 60mhz oscillator, from way back stuff.

Wait... Is that just the math coprocessor you're talking about? Or did people get the whole combination to run in an M24/6300 at 16 or 20MHz, including the V30 CPU?

Could you link to that information, maybe? Thanks!

Let me dig it up, I know I read the 16/16 combo as working, some guy has a yt vid of installation/setup

It was DOS Days, they mention testing such a setup:
https://dosdays.co.uk/topics/fastest_cpus.php

The section sampled below:

So the NEC V30 takes the cake as the fastest "stock" XT CPU if, and its a big 'if', you can get it to run stably at 16 MHz with all your expansion cards or somehow come up with a way to bus-divide so your ISA bus can tick along at a steady 8 or 10 MHz while the CPU and FPU run at 16 MHz. Without achieving a different bus speed, my advice is to use the highest quality ISA expansion cards you can - my very limited tests proved for instance that VGA cards from Tseng Labs took to an overclocked ISA bus much better than those from Trident. One key factor with graphics cards is to be sure they have the fastest video RAM possible - 70ns or faster.

Here is thee video I mentioned:
https://www.youtube.com/watch?v=8A_dCCx7XLk

Interesting. So it seems as if there is a decent amount of data for the V30 and the D9008D to work well at 16 MHz, but it doesn't appear that it has been successfully demonstrated with a V30HL. I wonder if there is any reason to believe it wouldn't work given that the V30 and the V30HL should essentially be identical, except for a better process being used for the V30HL.

I also didn't find the write-up convincing about V30 + D9008D being a functional combination.

DOS Days is a great web site with good reputation. However some statements are becoming obsolete and in this way misleading.
For example, the "8088/8086 (1st Generation)" section talks about ISA expansion cards having problems with 10-16MHz frequencies. This is incorrect.
Most ISA cards can handle 20-25MHz just fine. A handful can go to 27-30MHz.
Anyhow.

I will be interested if anyone that has a working setup with a V30 +D9008D @ 16 MHz can test to see if the same setup works with a V30HL @ 16 MHz. I think that would be just about the only way to know if the two are compatible.

My D9008D does not cooperate with any CPU/mobo. Tried on many. Either it is dead (the FPU) or works on some narrow cross section of hardware.

I have seen many videos, from such maxed out XT's and 286's, running benches and graphic speed tests, polygon based games in general, racers, action games, flightsims... F15 II still slow even in a tweaked, 0ws Harris 286. Stunts ran quite fine. Stunt Driver too. It also runs in XT's, just like the Hard Drivin' trilogy

86Box and Pc-Em has 16mhz V30 systems, in their selections. Stunts was still slow even at lowest low detail, cga graphics, and without any sound (!). I have an util called Pc-zip, used it with the option -W, that is, speedup by RAM refresh rarefaction.
LHX: Attack Chopper is a bit slow in an V30 but playable.

For a subjective test, some titles for a 8088 / 8086 : DragonStrike, Mean Streets, Prince of Persia, The Secret of Monkey Island, Falcon, Downhill Challenge, Starflight, Summer Games II, Space Rogue, Red Baron, Fighter Bomber, Gunship, Turbo Out Run, It Came from the Desert, Wing Commander, F-19 Stealth Fighter, A-10 Tank Killer, F29 Retaliator, Thexder, and those i mentioned.

Wonder if the emulated environment could be "tweaked" in such ways. (Fastvid and the MTTR's comes in mind, albeit it's 486+ territory. Also, the Cx586 - 686 register tweaks, Tweakbios, etc)

If a piggypack upgrade would have existed with some powerful 16 bit NEC Cpu's, that is, like the IBM 486SLC3. 100 Mhz upgrade CPU for the 286 systems in IBM's PS2 line. (this selection is also included in the mentioned PC Emulator's)