I am looking at the same manual. Both 64kx8 and 128kx8 work. Wanted to check if either one worked better for you, etc.
I have run into a board or two which did not want 128kx8 as TAG with 1024K total - it insisted on having 64kx8 as TAG.
On the two motherboards here stability is better if i use the top most SIMM slot.
I've run into this on some motherboards. Usually the first SIMM is closer to the northbridge chipset.
I checked today and yes, this makes no difference on LSD at 180MHz, but i remember seeing difference on Asus PVI at 160MHz. The later BIOSes give something like 0.1 or 0.2 fps extra.
In this sentence does "later BIOSes"refer to the Asus PVI board or the Lucky Star LSD board? If the LSD board, do you have a zip with all your LSD BIOSes? I only have one revision.
fast VLSI-200 286 motherboards...Its health deteriorating gradually
They certainly are of the right age for this. Cold solder joints aren't usually visibly apparent. The cruise control computer on my 1979 Mercedes stopped working about 12 years ago. A year ago, I decided to hand solder every single through-hole component on the PCB. It took about 3 hours and stunk up the whole house, but the cruise control works again. The stink was primarly due to this think lacquer paint Mercedes decided to plaster over the back side of the PCB and joints, probably for some sort of moisture protection.
I've had 386 boards of this era doing the same thing with cold joints. If you have a known good board of the same model, you can more systematically pin point the bad points with a multi-meter, but I don't think it saves a lot of time compared to simply reflowing every joint in a suspect region of the PCB.
Started with 125C for 5 minutes, then increased to 150C for 5 more minutes minutes, then 175C for 2-3 more minutes.
Did you use your kitchen oven, or a proper reflow oven? 175 C doesn't seem nearly hot enough to melt the existing solder. I suspect the expanding metal vs. fibreglass of the PCB just made the joint contact again, but new flexing could disconnect it in time.
I tried putting some dead graphics cards in the kitchen oven at around 245 C for some pre-defined amount of time, as proclaimed on youtube, but none of the cards were brought back to life. This was completely contrary to the youtuber's experience.
Plan your life wisely, you'll be dead before you know it.