![5.8.EEPROM saved CMOS Setup](/images/new-backgrounds/120273/12027367x1.webp)
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| MSB900/L Detailed Technical Manual V1.0 | ||||
CMOS Map continued... |
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| Location | Description |
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| 33h | Base Memory Installed |
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| Bit 7 | = Flag for Memory Size |
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| 0 | = | 640kB |
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| 1 | = | 512kB |
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| Bits | = Reserved |
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| 34h | Minor CPU Revision |
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| Differentiates CPUs within a CPU type (i.e., 486SX vs 486 DX, |
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| vs 486 DX/2). This is crucial for correctly determining CPU input |
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| clock frequency. During a |
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| CPU revision. |
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| 35h | Major CPU Revision |
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| Differentiates between different CPUs (i.e., 386, 486, Pentium). |
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| This is crucial for correctly determining CPU input clock fre- |
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| quency. During a |
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| revision. |
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| 36h | Hotkey Usage |
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| Bits | = Reserved |
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| Bit 5 | = Semaphore for Completed POST |
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| Bit 4 | = Semaphore for 0 Volt POST (not currently used) |
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| Bit 3 | = Semaphore for already in SCU menu |
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| Bit 2 | = Semaphore for already in PM menu |
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| Bit 1 | = Semaphore for SCU menu call pending |
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| Bit 0 | = Semaphore for PM menu call pending |
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| Definitions for these locations vary depending on the chipset. |
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5.8.EEPROM saved CMOS Setup
The EEPROM has different functions, as listed below:
•Backup of the
•Storing system information (i.e., version, production date, customization of the board, CPU type).
•Storing user/application values.
The EEPROM will be updated automatically after exiting the BIOS setup menu. The system will operate also without any CMOS battery. While booting, the CMOS is automatically updated with the EEPROM values.
Press the
This would be helpful, if wrong parameters are stored in the EEPROM and the setup of the BIOS does not start.
If the system hangs or a problem appears, the following steps must be performed:
1.Reset the
2.Press Esc until the system starts up.
3.Enter the BIOS Setup:
a)load DEFAULT values
b)enter the settings for the environment
c)exit the setup
4.Restart the system.
The user may access the EEPROM through the INT15 special functions. Refer to that chapter in the GEODE
The system information is
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