Nice build!
I think you will not be very happy with the Soundblaster PCI card if you want to play some games in MS-DOS mode, inside Windows it will work fine though.
The Pentium II 266 is also a bit too slow (when writing "a bit" I really mean "very much") to do the nice Voodoo 5 5500 card justice.
Both issues are easy to fix, add a Sound Blaster ISA card to the build and replace the CPU with a faster one.
To get a faster CPU than a PII 450 working with your Biostar M6TBD you will need to update the BIOS. See this recent thread for reference. Perhaps member darry could share the pached BIOS he used?
Help needed with booting slot1 boards with unsupported CPUs
Remember that CPUs with 133 MHz FSB will not run at full speed on your board as it only supports 66 and 100 MHz FSB. 100 MHz FSB versions of Pentium III and Coppermine Celerons were made in speeds up to 1.1 GHz but you will need to use a FCPGA to Slot1 adapter (slotket). Make sure you get an adapter that actually support the Coppermine CPUs as not all do.
I did some Ebay searching and most slotkets available are of the cheap kind which only supports the PPGA Mendocino Celerons or seem unreasonable expensive with shipping.
I thought these (links below) were bad deals at first but after doing some more searching I think things actually have got this expensive so it might actually be worth it. Only a couple of years ago these prices would have seemed outrageous.
The Russian sellers slotket looks cheapish and has had some minor repair done to it but at least it has VID selection jumpers which is important to get Coppermine CPUs working with early revison i440BX boards that lacks the correct VRMs to support the needed 1.65V - 1.75V.
The VRM issue is solved by changing the CPUs VID to 1.8V which 99.9% of the motherboards support. If you compare your board revison with member darry and its the same or newer you can be reasonable sure you can jumper the slotket for the correct VID, otherwise I would use 1.8V or make sure the board is giving the CPU the correct voltage with a DMM.
Stuff from Russia or the Ukraine rarly get cought in the customs net. At least it has never happend to me and I have bought loads of stuff from Russia and the Ukraine.
The Coppermine P3 1.1 GHz from Russia with slotket. $49 + $10 shipping.
http://www.ebay.co.uk/itm/SLOT1-SLOTKET-WITH- … nUAAOSw5cNYST1i
A Coppermine P3 1.1 GHz FC-PGA CPU (without slotket) from the Ukraine costing $46 + $5 shipping if someone else can hook you up with a better slotket.
http://www.ebay.co.uk/itm/Intel-Pentium-III-1 … %3D302210318578
Be sure you get the BIOS with Coppermine support before you spend any money on expensive stuff from Russia or the Ukraine. 😀
There are of course cheaper more hassle-free options like getting a Slot-1 Katmai P3 600 with 100 MHz FSB but with a Voodoo 5 I would want 1 GHz or more.
New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.