Remember: The "new manual" you are looking for is a recently published document. It is the final revision (Rev 2.0) of the Aspire M3800 Service Guide from 2010.
Even the for the Acer MG43M is still 16 years old. Here is modern context to save you hours of frustration.
Acer doesn't provide a standalone manual for the MG43M. To get the documentation you need, use one of these targeted approaches:
You can often find the required drivers via Windows Update. acer mg43m motherboard manual new
The MG43M is an socket motherboard typically paired with Intel Core 2 Quad or Duo processors. Chipset: Intel G43 / ICH10. Memory: DDR3 DIMM slots.
The motherboard features standard 9-pin blue headers for internal USB 2.0 extension.
Use low-density, double-sided (2Rx8) RAM modules containing 16 memory chips (8 on each side). Modern single-sided high-density DDR3 modules will cause the system to beep or fail to POST. Remember: The "new manual" you are looking for
Enter BIOS. Navigate to Integrated Peripherals and toggle between and AHCI modes. System loses time/date Dead CMOS battery
Align the notch on the bottom of the RAM stick with the break in the slot.
Six color-coded SATA II headers line the bottom right corner for hard drives and optical drives. Here is modern context to save you hours of frustration
Compatible with Intel Core 2 Quad, Core 2 Duo, Pentium Dual-Core, and Celeron processors with a Front Side Bus (FSB) of 800/1066/1333 MHz.
Upgrade to an SSD via the SATA II port. Although it is not SATA III, the random read/write speed boost will make the system feel significantly faster.