The Pentium M has so far pulled you through, its an excellent cpu for graphics - has its limitations of course, its not going to compete with the top end cpus for desktops. Mobility Radeon graphics depend on the main cpu for crunching graphics data, it does not have a separate system aka video card to off load the graphics work - particularly the 3D graphics work which is many times more intense than 2D.
V1.52 placed more work on the graphics card to release main system RAM, as such, yours does not have one, that extra work pushed it over the edge. The graphics core of the 9200 has limitations in coping with 3D as you have already noticed, but it can run - just - as long as low texturs / lower res etc are used. You will run into problems as time goes on and you use larger Civ scenarios in Large / Huge maps.
The next Patch is due in about 2 weeks, given no last minute issues with testing etc. It willhave another significant improvement in memory use - plus all the usual ongoing fixes etc. That better use of memory will be important for you, so dont give up hope if the suggestions below dont work.
- They included a "memsaver" switch in V1.52, it turns off some memory changes that placed more load on Video Cards, and left them operating in system RAM.
Go to C:\Documents and Settings\New User\My Documents\My Games\Sid Meier's Civilization 4\CivilizationIV.ini
Open it with Notepad
Set the ini lines to the figure shown below (in ini file Figure 0 means "off", figure 1 means "on"). Back up ini file first so you can recover to start point if get confused.
- Your graphics drivers are Jan 2004, try a slightly older set - not latest and greatest, latter will have various functions in there that the 9200 knows nothing about.
http://www.omegadrivers.net/
Click ATI Radeon - Click sub menu Archive - Click sub menu Win 2K
Scroll down that page until you see Radeon Omega Drivers 2.5.97a (Catalyst 4.12) they are not the latest,but they are a very stable reliable set, and probably better for your older setup. If they dont work properly, try Radeon Omega Drivers 2.6.83 (Catalyst 5.11) at the top of the page. The Omega drivers have been very successfull for alot of people - particularly those with older graphics setups
There are a number of other things you can try at
http://forums.civfanatics.com/showthread.php?p=3607616#post3607616 post 4
Doubtless some you have already applied / been through. however, check though them - its designed to reduce the loadon the graphics processing & cpu, the latter is important for you given the weak graphics (in 3D terms) that you have.
If still stuck, hang on for the next Patch. If after that, stillstuck, then need to look more seriously at a hradware upgrade.
Regards
Zy