RamCheck and RomCheck

[MaxKing]

Could anyone please tell me how RamCheck and RomCheck are done when the computer boots

thanks

[Paleo Pete]

Never heard them called ROM check and RAM check, but maybe I can offer a few explanations.

POST is the basic boot process. Power On Self Test is what the acronym (right word?) means, and where the action occurs.

ROM is Read Only Memory, also sometimes called non-volatile, since it can't be erased. This usually refers to the BIOS or CMOS. Basic Input Output System is the heart of the boot process. The BIOS information is stored in a ROM chip called CMOS, or Complimentary Metal Oxide Semiconductor. BIOS reads the information in the CMOS chip, which tells the computer what specific periferals are present, and how to use them, as well as checking the chip itself to be sure it is functioning properly. CMOS is not the only ROM memory in the box...

RAM is Random Access Memory, also called volatile, since it can be erased, it can be written to as well as read. RAM is checked after the POST is complete, and the operating system begins to take control of the system. It is usually checked by himem.sys.

RAM is also checked by the POST, to insure that it is the proper type, and is compatible, and how much is available. The system sends certain signals to the RAM, and checks the results, to be sure it has recieved the data, and sent it on its way. Depending on BIOS settings it might also run a Parity check. I'm sure a search of the PC Guide will turn up a much better and more technical explanation than I can come up with, since I have to dredge it up from memory, and I'm not very likely to get it exactly right. But that's basically what happens, as best as I can relate it anyway...

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