VOGONS


First post, by Bancho

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I thought I would share with a rig I've been working on for a good while now. It is at a stage now that I'm happy with it and covers a good range of games. I've still to map all the speeds available on this and is something I plan to carry out in the very near future. I've seen this build done a few times now and this is my take on it.

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Spec wise the machine is currently configured as follows.

VIA C3 1.2ghz Nehamiah CPU
MSI MS-6905 2.0 Master Sloket
Gigabyte GA-6BXC Rev 2.0 Intel BX, Powerleap BIOS
3DFX Voodoo 3 3500TV (With Fan Attached)
Matrox M3D Power VR
USB 2.0 Card for easy transfers
Keropi Music Quest MPU-401 Card with Dreamblaster X2 - Connected Externally MT-32 and a number of Midi Modules
Turtle Beach Malibu Surround 64
Creative Labs AWE32 CT3900 With 8MB Ram and a Trust Korg Sound Module
Pioneer Slot Loading DVD ROM
80Gig Hitachi HDD
Floppy Disk Drive
300WATT PSU

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As with most of my builds I try my best to manage the cables which makes it easy to work on the system. I'm hoping now that I don't have to mess to much with the innards!

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As for the Software side of things it is running Win98 SE and I have set it to boot directly to DOS. UNISOUND is used to initialise both cards. I use kolohimal's CPUSPD program to manipulate the CPU multi's and cache options and Rayers SMB for FSB change on the fly. In my brief testing I have got the CPU to 266mhz and 1400mhz at the top end. The board has a 50fsb option but it seems unstable and won't work with all multipliers. I plan to do a full map along with the throttle optioned offered in CPUSPD.

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On the sound front I think it offers a good selection of sound and a great number of MIDI options. I need to test but I intend to connect my MT-32 to the 3.5mm jack Midi out on the MPU-401 and use the DB9 for GM Devices. I mix all this using a Maker Heart Just Mixer 5. Its a great mixer and is the perfect size due to not having too much space!

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Hope some of you like my build

Cheers!

Reply 2 of 9, by Bancho

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I actually picked the C3 because of its ability to slow down with fine adjustments. This machine will be used to play a good majority of DOS games and Win9x Games. With the CPU clocked at 1.4ghz this give a speedsys equivalent of a 800mhz Athlon. For the games which are more demanding or want to run at higher resolutions I have a Tualatin 1400-S with a Ti4600.

Reply 3 of 9, by mothergoose729

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I have a work in progress build very similar to yours. If you add in ACPI clock skipping you can get down to 8088 speeds and also hit the 486 reference points.

https://docs.google.com/spreadsheets/d/1usQPR … dit?usp=sharing

On my slot 1 machine I also find that 50mhz FSB is not as stable. Since you can run a lower multiplier with 66mhz fsb I think that is the better way to go.

Reply 4 of 9, by Bancho

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mothergoose729 wrote on 2021-02-07, 15:53:

I have a work in progress build very similar to yours. If you add in ACPI clock skipping you can get down to 8088 speeds and also hit the 486 reference points.

https://docs.google.com/spreadsheets/d/1usQPR … dit?usp=sharing

On my slot 1 machine I also find that 50mhz FSB is not as stable. Since you can run a lower multiplier with 66mhz fsb I think that is the better way to go.

I think I used your chart as a reference when I was messing with my K6-III+ build! When you refer to the ACPI clock skipping, are you referring to throttle? Have you tried kalohimal's CPUSPD? That has a throttle option built in to the program. I'll use your table as reference and see what I can achieve! 😀

Reply 5 of 9, by mothergoose729

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Bancho wrote on 2021-02-07, 16:14:
mothergoose729 wrote on 2021-02-07, 15:53:

I have a work in progress build very similar to yours. If you add in ACPI clock skipping you can get down to 8088 speeds and also hit the 486 reference points.

https://docs.google.com/spreadsheets/d/1usQPR … dit?usp=sharing

On my slot 1 machine I also find that 50mhz FSB is not as stable. Since you can run a lower multiplier with 66mhz fsb I think that is the better way to go.

I think I used your chart as a reference when I was messing with my K6-III+ build! When you refer to the ACPI clock skipping, are you referring to throttle? Have you tried kalohimal's CPUSPD? That has a throttle option built in to the program. I'll use your table as reference and see what I can achieve! 😀

The community has several spreadsheets like that floating around, I mimicked the format 😜. I don't remember exactly what software I used for clock skipping... I use the same tools for cache, multiplier, FSB and all of that for sure.

I have read mixed reviews of people using clock skipping as a method for slow down. It is something I plan to test myself soon. Considering the C3 Nehemiah can do 386 speeds and fast 486 speeds without clock skipping I think there is a lot of potential. Only a handful of games need exactly a 486 DX33/66 or similar and they might be fine with clock skipping even if maybe some other games act up.

Reply 7 of 9, by mothergoose729

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Intel486dx33 wrote on 2021-02-07, 20:45:

How slow can you go ?
Can you post some benchmarks ?

The slowest I got it was speedsys score of 0.48. I ran the MIPS benchmark and I scored pretty close to an 8088@4.77mhz. It was a bit higher in memory throuput (1.48 I think), a bit lower in integer performance if I recall (something like 0.98).

Without ACPI clock skipping, you can get it down to about a 386dx16.

Reply 8 of 9, by Bancho

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Added the Midi modules to the mix now.

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Midi stack consists of

Roland SC-7
Yamaha MU10
Roland MT-32
Kawai GMega LX XC-3
Korg NS5R with a Dreamblaster s2 on Channel C
Roland Sound Canvas SC-55

And the setup in action! The Monitor is a 19" CTX PR960F Trinitron Display. I need to try and sort this area. Its a small space but I think I could make it work a lot better. Need some shelves!

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Last edited by Bancho on 2021-02-17, 10:17. Edited 1 time in total.