kixs wrote on 2023-07-08, 19:21:

Since I was replacing a blown up Tantalum cap on one wavetable card today and had some free time, I took the chance to do the o […]
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Since I was replacing a blown up Tantalum cap on one wavetable card today and had some free time, I took the chance to do the oscillator removal on one 286 board and replacing it with a socket - this was in the plans for many years 🤣

Originally running at 20MHz with soldered Harris 80286-20, I tested it up to 27MHz. Screenshot at 25Mhz as a teaser. Will do another thread for "Kixs's 286 to the Max Too" soon 😁

what chipset?

kixs wrote on 2023-07-08, 06:49:

iPonRMA wrote on 2023-07-05, 19:11:

I know its an old thread, but i just built my first version of "FAST 286" project a few weeks ago. Still at 25MHz...

Nice build 😀

But some specs with more photos would be nice 😁

Thanks. The motherboard has a "PC-CHIPS3" chipset (or something with this sticker on it), 25MHz Harris CPU, Cyrix 287XL+ FPU, 4MB SIMM RAM, Tseng ET4000W32i videocard, 1.2MB & 1.44MB FDD, Seagate 520MB HDD, Creative Sound Blaster Pro2.
Here is a video with some benchmarks and games:

https://www.youtube.com/watch?v=c2TBeuVWuQA

I will try other mobos soon with FSB increasing.

maxtherabbit wrote on 2023-07-09, 01:04:

kixs wrote on 2023-07-08, 19:21:

Since I was replacing a blown up Tantalum cap on one wavetable card today and had some free time, I took the chance to do the o […]
Show full quote

Since I was replacing a blown up Tantalum cap on one wavetable card today and had some free time, I took the chance to do the oscillator removal on one 286 board and replacing it with a socket - this was in the plans for many years 🤣

Originally running at 20MHz with soldered Harris 80286-20, I tested it up to 27MHz. Screenshot at 25Mhz as a teaser. Will do another thread for "Kixs's 286 to the Max Too" soon 😁

what chipset?

More info here:
Kixs's 286 to the Max Too

The Bench_XT package is excellent, and I managed to test Wolf3D on Madness machine.
R3800X @4GHz def, 2C/2T/NV7900GS/SB0060/sound on/SBEmu/FVid LFB/WC on :

Machine in SpeedSys :

Just wanted to add some interesting stats from a 386sx 25MHz board I've been testing.

Chipset: Chips & Tech F82C836 B-25
CPU: Intel 386sx-20 at 25MHz
RAM: 8MB 60ns, 8 SIMMs
VGA: Trident 8900D-R, 0WS, 1996 dated Siemens FP RAM

The F82C836 was an "A", but the "B-25" models are available to buy new so I soldered the B-25 on. No performance difference but may be able to clock higher.

The F82C836 is a 0WS 25MHz-max chipset with hidden refresh.

ISA Bus 10MHz:
3DBench: 8.2
Landmark VGA: 4777

ISA Bus 12.5MHz:
3DBench: 8.4
Landmark VGA: 5957

Linear 1.25x increase for Landmark, but only 1.02x increase for 3dBench.

Also tested a CL-GD5429 (1WS). Landmark VGA score was ~4770 at 12.5Mhz, the same as the 0WS Trident at 10Mhz.

CacheChk RAM speed was 11.1MB/s.

MikeSG wrote on 2024-04-19, 10:32:

Also tested a CL-GD5429 (1WS). Landmark VGA score was ~4770 at 12.5Mhz, the same as the 0WS Trident at 10Mhz.

Your Trident is -R variant, which apparently means reduced (in terms of complexity) for cost optimization. Not sure how it compares to non-R 8900D but I do know you need 1MiB of VRAM on 8900D to get to to full 32-bit internal bus speed. 0WS setting is important too but it's that 32-bit internal bus that mostly sets apart 8900D and other, slower cards.

This is the card. There are less components, however BIOS/screen overlay says 1MB on boot.

RAM is two "256k x 16bit". 16ms refresh cycle. 2x longer than 1991 DRAM (mb81c4256a-70p).
https://html.alldatasheet.com/html-pdf/45237/ … 14171BJ-50.html

8900D's are also 48MHz.

A list of 0-wait state video cards ranked by performance would be interesting.. obviously the Tseng W32i is at the top.

Eg. Landmark Video (chr/ms):
Tseng ET4000 W32i: 8057 (bus MHz?)
Trident 8900D-R: 5957 (12.5Mhz)
Cirrus Logic 5420...