User manual ACER ALTOS R720 M2

[. . . ] You can upgrade the system memory by installing single inline memory modules (SIMMs) into the SIMM sockets or by changing the SIMMs for a higher memory configuration. The four 72pin SIMM sockets support 4-MB and 16-MB single-density as well as 8-MB and 32-MB double-density SIMMs. 1. 3. 1 Rules for Adding Memory · · · · Always install SIMMs from the lowest bank first. For example, use bank 0 before bank 1, bank 1 before bank 2, and so on. Always remove SIMMs from the highest bank first. [. . . ] Table 1-2 lists some of the possible memory configurations when a dual-Pentium (3. 3V) CPU board is installed. Banks 0 and 1 are on the system board; banks 2 and 3 are on the dualPentium (3. 3V) CPU board. Table 1-2 Some Possible Memory Configurations when Using the Dual-Pentium (3. 3V) CPU Board Bank 1 S0 S1 Bank 2 S0 S1 Bank 3 S0 S1 Total Memory 8 MB 8 MB 8 MB 8 MB 4 MB 8 MB 8 MB 8 MB 8 MB 4 MB 8 MB 8 MB 8 MB 32 MB 32 MB 32 MB 32 MB 16 MB 16 MB 16 MB 16 MB 32 MB 32 MB 24 MB 56 MB 120 MB 16 MB 48 MB 192 MB 256 MB Bank 0 S0 4 MB 4 MB 4 MB 4 MB 4 MB 8 MB S1 4 MB 4 MB 4 MB 4 MB 4 MB 8 MB 16 MB 16 MB 32 MB 32 MB * 16 MB 16 MB 32 MB 32 MB 32 MB 32 MB 32 MB 32 MB S0 and S1 stand for socket 0 and socket 1 respectively. The above configurations are only some of the available memory combinations. You can use other combinations as long as you follow the rules when upgrading memory. Refer to section 1. 3. 1. 1-6 User's Guide Models using the Pentium (3. 3V-ECC) CPU board have two additional 72-pin SIMM sockets. With the additional sockets, you can upgrade the memory to 192 MB using 32-MB SIMMs. Table 1-3 lists some of the possible memory configurations when a Pentium (3. 3V-ECC) CPU board is installed. Banks 0 and 1 are on the system board; bank 2 is on the Pentium (3. 3V-ECC) CPU board. Table 1-3 Some Possible Memory Configurations when Using the Pentium (3. 3V-ECC) CPU Board Bank 1 S1 4 MB 4 MB 4 MB 8 MB 4 MB 8 MB 16 MB 32 MB 8 MB 8 MB 16 MB 4 MB 8 MB 16 MB 32 MB 8 MB 8 MB 16 MB 4 MB 8 MB 16 MB 32 MB 16 MB 32 MB 4 MB 8 MB 16 MB 32 MB 16 MB 32 MB 4 MB 8 MB 16 MB 32 MB S0 S1 S0 Bank 2 S1 Total Memory 8 MB 24 MB 56 MB 112 MB 24 MB 48 MB 96 MB 192 MB Bank 0 S0 4 MB 4 MB 4 MB 8 MB 4 MB 8 MB 16 MB 32 MB * S0 and S1 stand for socket 0 and socket 1 respectively. The above configurations are only some of the available memory combinations. You can use other combinations as long as you follow the rules when upgrading memory. Refer to section 1. 3. 1. System Board 1-7 1. 3. 2 Installing SIMMs Read the ESD precautions in section 1. 2 before proceeding. Follow these steps to install a SIMM: 1. Slip a SIMM at a 45o angle into a socket with the component side facing down. Gently push the SIMM to a vertical position until the pegs of the socket slip into the holes on the SIMM, and the holding clips lock the SIMM into position. The SIMM should be at a 90o angle when installed. Hole Peg Clip Figure 1-2 Installing a SIMM Always install SIMMs starting with Bank 0 and in pairs. For example, for a total memory of 8 MB, install two 4-MB SIMMs in sockets 0 and 1 of Bank 0. There are two general types of error messages: · · Software System * Default setting System Board 1-13 1. 6. 1 Software Error Messages Software error messages are returned by your operating system or application. These messages typically occur after you boot the operating system or when you run your application. If you receive this type of message, consult your application or operating system manual for help. 1. 6. 2 System Error Messages A system error message indicates a problem with the computer itself. A message of this type normally appears during the power-on selftest, before the operating system prompt appears. Table 1-5 lists the system error messages. Table 1-5 System Error Messages Message Action Replace the RTC chip or contact your dealer. Check the RTC chip and the necessary jumper. If the battery is still good, run Setup. Run Setup Check and connect the control cable to the diskette controller. Run Setup and select the proper drive type. Run Setup and select the proper drive type. Modify DRAM configuration to agree with one of the options in Tables 1-1, 1-2, and 1-3. [. . . ] Replace the keyboard or contact your dealer. Contact your dealer. Fixed Disk 0 Error Fixed Disk 1 Error Keyboard Error or No Keyboard Connected Keyboard Interface Error Memory Error at: MMMM:SSSS:OOO (W:XXXX, R:YYYY) where: M: MB, S: Segment, O: Offest, X/Y: write/read pattern Memory Size Mismatch CPU Clock Mismatch Check the memory size based on the system specifications. If you are sure that connections and values are correct, ignore the message. If the message reappears, ask for technical assistance. [. . . ]