4Mx32 is equivalent to 16Mx8 -- that is, 8-bit bytes. 4Mx36 = 16Mx9 -- 8-bit bytes plus parity. The parity is an error-checking bit that identifies when something got corrupted in RAM. Early boards (and servers) require this. Many others support it as a configurable option either by jumper or in the BIOS.

The PNP cards are fine, it just requires a PNP Configuration Manager to handle setting up the card at boot-up. A little longer boot time, a couple more things to configure in your config/autoexec, but other than that.. it's just a Sound Blaster. Everyone here has been through it and can help if you get stuck.

For video cards... if you have PCI and VLB, then you have tons of options. I always equate a 486 to VLB, but the selection is better over in PCI land. For plain DOS, you can't really go wrong either way. Tseng ET4000s get lots of love for being fast, but by the VLB era, the slightly more compatible chipsets like S3 et. al. are a good choice. For the most part, if you find a VLB card, it's probably fine.

I'm not really up on which PCI cards are good for DOS. You want good VESA BIOS support if you can get it. By the time I was using PCI, I was all the way Windows and looking for 3D support.

A good PCI "2D" card is either Matrox Mystique or Millenium. Fast and GREAT picture quality. Once you're accustomed to a sharp image you will direly miss it when working with subpar solutions.

For video. Get an Cirrus Logic CL-5446-PCI for any 486 system that have PCI. On a 486 it is extremely compatible, and is my goto card for this platform. Unless you can find an S3-Virge325 or S3-Trio64v+ that have perfect black level. These three cards are to me the top dogs on 486 platforms, when we are talking Dos compatibility. And let's face it, a 486 will never be have any problem feeding any of these cards, so they are basically equally fast on a 486.

ok i looked when i got home and i have a Trident 3Dimage 9750 i am going to see if there is any Windows 3.11 Drivers for this
i do see a few Cirrus Logic CL-5446 and S3-Trio64v+ on ebay

I use a Mystique in my Pentium. It was my first 3D card. I used it for years until I got a Voodoo 3, and just kept it because I loved it so much. Nice thing is, you can still get drivers from their site. It does seem to work well in DOS, for the FPS games that I play on that build. It definitely looks nicer than my Tseng VLB, which has the vertical lines issue with my VGA > OSSC > LCD TV setup.

I got a Cirrus Logic CL-5446-PCI with 2 mg off Ebay for $20 shipped. it was delivered yesterday works good in my P1 233 computer i may get 1 more

I am looking at the manual and i am confused how to set the voltage as most intel 486dx2 66mhz are 5v? and this AMDx486 DX2 66mhz is 3v?
the mother board is not here yet still in the post..

Looking at the following....
http://arvutimuuseum.ee/th99/m/E-H/32523.htm

Then you can set the CPU type by the jumpers: JC1, JC2, JC3, JC4, JC5 and JC6.
The resistor pack, long black one with circa 6-pins, sets the voltage. And can be set on eighter: RN18, RN19 and RN20.
No resistor pack, means 5volt CPU's.

You need to take a look at the following website and find your specific CPU.
http://www.cpu-world.com/CPUs/80486/MANUF-AMD … =Go&goto_type=0

Someone on Vogons might have explained this before, if not then I hope you can get it to post.

brostenen wrote:

Looking at the following.... http://arvutimuuseum.ee/th99/m/E-H/32523.htm […]
Show full quote

Looking at the following....
http://arvutimuuseum.ee/th99/m/E-H/32523.htm

Then you can set the CPU type by the jumpers: JC1, JC2, JC3, JC4, JC5 and JC6.
The resistor pack, long black one with circa 6-pins, sets the voltage. And can be set on eighter: RN18, RN19 and RN20.
No resistor pack, means 5volt CPU's.

You need to take a look at the following website and find your specific CPU.
http://www.cpu-world.com/CPUs/80486/MANUF-AMD … =Go&goto_type=0

Someone on Vogons might have explained this before, if not then I hope you can get it to post.

Yes ok I see it.. I wish they would have been more clear on what 3 slots control x voltage. The resistor network shood not be hard to find I see them in CB and ham radios I have fixed. Just need to fined the value or confirm I see on a post on a diff forum it is 0 ohms if so I can make one.

So what I see confirms what you're saying no resistor network packs equal 5 volts.
They made setting the voltage kind of convoluted.

If I am reading this right.
No pack = 5.00v
RN18 = 3.45v
RN19 = 3.30v
RN20 = 3.00v

Yeah this the one I have 66NV8T. It runs the core at 3volts

https://en.wikichip.org/wiki/amd/am486/am486dx2-66nv8t

mkubiak402 wrote:

Yeah this the one I have 66NV8T. It runs the core at 3volts

That's cool. Literally 😉

ok this is what i dug up on the Resistor Networks

i found part number 4308H-102-102LF

https://www.mouser.com/ProductDetail/Bo ... %2fg%3d%3d

https://www.mouser.com/datasheet/2/54/300H-776177.pdf

The plug in Block

Are you positive that's the right kind of resistor pack? I'm often ignorant of how the industry has standardized certain things, so I could be full of wind, but I've also seen resistor packs where there's one common pin, and an array of resistors connected to it. So the pinout would be COM, R1, R2, R3.... Think of it like a common anode arrangement, if resistors had A/K ends. This is probably more for a bus terminator application, and so maybe there's a reference designation that is more appropriate to refer to that type. Just be aware.

SirNickity wrote:

Are you positive that's the right kind of resistor pack? I'm often ignorant of how the industry has standardized certain things, so I could be full of wind, but I've also seen resistor packs where there's one common pin, and an array of resistors connected to it. So the pinout would be COM, R1, R2, R3.... Think of it like a common anode arrangement, if resistors had A/K ends. This is probably more for a bus terminator application, and so maybe there's a reference designation that is more appropriate to refer to that type. Just be aware.

Yes they have 3 different types from what i am seeing on what people have tested there 0 Ohm Isolated Resistors the one i posted seems to be right.