|I just took a look at the PCChips web sites - they have downloads and info for m848a, but ONLY for Rev 5.0, on both the USA and global web sites.|
Taiwan, English, global
You cannot use the cpu support info for a newer Rev and be sure it applies to an older Rev.
You cannot use the bios updates for a newer Rev unless it says on the page where the bios updates are or in readme files or release notes for it that you can use the same bios updates on an older Rev.
In most cases, when the main Rev number changes, e.g. 2.x to 3.x, the I/O chip has been changed, or some other major chip has been changed, that requires different bios code to recognize it. If you use the wrong bios update, it is likely the mboard will not boot normally the next time you boot after you flash the bios, if it doesn't just plain refuse to flash the bios when you attempt to.
I looked at many of my third party sources for PCChips mboard info and downloads - they either have nothing for 8xx series mboards, or many are now dead links, so I haven't found anything from those sources.
You may be out of luck.
You could tryt searching for: bios update m848a rev. 2.1 or similar (or 848a) on the web, but you may not find anything, or any info about what cpus that rev or the bios update supports.
Regarding the max fsb speed and mhz cpu connected to it can support, any mboard that has the same two main chipset chips would have the right info in the specs or the manual for it, but usually one of the two has a heatsink on it.
If the one that does not have a heatsink has a model beginning with HT on it, it was renamed by the manufacturer when it was made to what Hsing Tech wanted to name it - what it actually is can be looked up on the web.
However, there's one thing you could try, if you do have another cpu that works in the mboard. Since it's quite possible the same mboard model was also sold by another vendor, if you can supply the bios string you see when you boot the computer, or if you can use Bios Agent, I may be able to find another brand's identical model that has info I can point you to, and possibly bios updates for it - when it's a Hsing Tech mboard, the vendor's bios updates are usually identical to the Hsing Tech / PCChips updates.
The bios string is usually a long string of numbers/letters at the bottom of the first black screen as you boot your computer - it often begins with a date - usually you can press the Pause key to read it and copy it down, and press any key but Pause to continue booting.
If you also have a hard drive with Windows installed on it on the mboard...
Go here, download BIOS AGENT.
Run BIOS AGENT to find your bios string.
- here's the link that downloads Bios Agent
The current Bios Agent calls the bios string the Bios ID.
Tell us the Bios ID it finds, or everything Bios Agent finds, and include any dashes, etc.
Bios Agent must be used in Windows.
If you do have other socket A cpus but have not tried them, your mboard should support most socket A cpus that use 266mhz or less, including the older Athlon pre-XP cpus; it may not support an XP2600 266mhz, which were and are relatively rare to find used (most you find on the web are XP2600 333mhz; Barton core); it may not support anything above XP2600.
There is another option if you're not opposed to spending some bucks.
Search for a bios UPGRADE (not a bios update) for it. There are vendors on the web that make modern bios upgrades for older mboards that will support all the possible settings and cpu types your main chipset will support - that often goes beyond what the newest mboard manufacturer's bios update supports - and you should be able to contact them to ask if the cpu you want to use would be supported.