Post some pictures, any old system is worth the time if you are into collecting these things. 🤣

Well it's not as much a matter of collecting as one of here take it.. 🤣. Will get going on some pics in a few minutes and get them up here.

EDIT ::: photos added

Hah! That was my first PC that I bought for myself! It is exactly the same, except mine only had an 80mb hard drive.

That old clunker got me started into PC computing.

That's damn cool! Who cares if its an sx? It still looks cool and you can play some fun games 😀

Yeah I agree, it's pretty cool looking. You should keep it if it works!

Great to hear the comments on it 😁

Guess I need to start trying to figure out what I can and can't do to it now. Example being what chips can I put in the empty blocks near the RAM.

I am not as technical as I wish I was. I just take parts, throw em together and hope it works most of the time.

I've noticed a difference between your motherboard and the one I had. Mine had an empty socket so that it could be upgraded later with the DX math coprocessor. Your board has the empty spot for the socket, but it is missing.

Thought the second processor just dropped into the slot there, shows how much I know 🤣

Bullmecha wrote:

Thought the second processor just dropped into the slot there, shows how much I know 🤣

I think you might be right. From the top-down view of the photo, it appears to be missing at first glance. I may be the one who is wrong.

Just got a quick shot of 2nd socket for you.

Bullmecha wrote:

Just got a quick shot of 2nd socket for you.

Yep, you do indeed have the socket. I was wrong before.

I'm a bit jealous. You're gonna have fun with that system. I ran DOS 6.22 and Windows 3.1 when I owned mine. I do hope you'll enjoy Falcon 3.0 and X-COM with yours, as I did with mine back in 1994.

Bullmecha wrote:

Guess I need to start trying to figure out what I can and can't do to it now. Example being what chips can I put in the empty blocks near the RAM.

This board looks similar, don't know if it exactly the right one: http://stason.org/TULARC/pc/motherboards/A/AS … -PRO-4-25S.html
According to this the sockets should be for cache chips. That would be a worthwile upgrade.

Try to fire it up with SIMMs and a CPU first before you get cache.

Well....
I got the old gal back to a semi assembled state. I added in 16MB RAM, got the CRT plugged into the onboard Cirrus Logic, hit the power and NODDA. I swapped out the power supply and got power to the board but no post to video. I then tried with an ISA CHIPS based video card and still nothing. I can't find this specific PC manual but may need to look at some around its classification from AST for jumpers. I will keep trying to revive it.

Sitting on the desk of the works in progress.

8bit ISA video card i tried.

Bullmecha wrote:

Well.... I got the old gal back to a semi assembled state. I added in 16MB RAM, got the CRT plugged into the onboard Cirrus Logi […]
Show full quote

Well....
I got the old gal back to a semi assembled state. I added in 16MB RAM, got the CRT plugged into the onboard Cirrus Logic, hit the power and NODDA. I swapped out the power supply and got power to the board but no post to video. I then tried with an ISA CHIPS based video card and still nothing. I can't find this specific PC manual but may need to look at some around its classification from AST for jumpers. I will keep trying to revive it.

Semi-assembled.JPG

Sitting on the desk of the works in progress.

Chips F82C451 A.JPG

8bit ISA video card i tried.

That is an awesome computer. Those are the types of PC's I just love to restore. Many friends of mine had AST's and I always liked them. I have a minitower 486DX266 and it kicks but.

The large socket on the board can be fitted with a a 486 CPU up to a DX2 66 I believe and then you probably just need to change a jumper switch. This computer is very similar to one of my first PC's which was a 1MB 486SX25....almost the same specs as what you have there. I had the same kind of soldered on 486 cpu and the expansion CPU socket. I since have upgraded it to 4MB and with a 486 DX33 cpu.

Anyways, I really hope you get it working. Maybe a BIOS chip is missing?? I don't know, I'm a bit ignorant when it comes to getting these old boards up and running sometimes. I just keep trying stuff until it works...."trial and error" is my friend 🤣.

Sometimes MOBOs die. When all chips are plugged in and the jumpers set right it may just have an invisible issue. Not worth spending a lot of time / funds. Unless you enjoy it of course.

Hello ! It's my first post on this forum but I read it for years ...
I've almost the same computer (AST Bravo LC 4/33) and I remember that this mobo don't accept every simm 72 sticks. I've replaced the mobo recently for a later model with write back support and the new one support some simm sticks that had never worked on the old one (and some ram sticks that worked on the old one doesen't work on the new one ^^). I don't remember if it was FPM or EDO... but maybe you should try both type... Only one simm should work for test because 72pins simms are 32bit wide.
Here is some old photos of my system before the upgrade (mobo ref.202560) and after (mobo ref.202688).
It came out of the factory with an i486 DX-33 in the socket, no soldered CPU was present. After several years I upgraded it with an Evergreen Am5x86-133 and in 2012 I replaced it with a POD83 but it worked only in WT mode and was slow. I found a later mobo (Bravo 4/66d) on Ebay with ZIF socket 3, physical VLB and WB support so I replaced it and put the old one in stoarge.
Note : The 202560 support only 5V CPUs and the 202688 has a voltage regulator; the CPU voltage can only be set between 3.3 and 3.6V if I remember so 5V CPUs don't work with it.

I just seen that the power connectors arranged a bit awkwardly on the board (well, the board is an awkward L shape anyway 🤣). The question is: Are you sure you put them in a correct way? AT power plugs are almost never appropriately keyed, so it is always possible to put them in a wrong fashion. For normal side by side arrangement, the rule is "black cables are in the middle" but I'm not sure if this also applies to your board.

The other thing is, the board has 72 pin SIMMM slots for ram, which means only one stick is enough to boot it. This way, you can just try 4 different SIMM sticks of your separately to decrease the possibility of a bad stick.

I checked the connections and mine are "ground Facing out" due to the small "pin" on connection lining up on the socket. Still it doesn't live =(