![]() The description how to use this instruction you can find in wikipedia - put value 80000001h in EAX, then call instruction cpuid and then check out bit 29 of register EDX. How to find out how many bits your processor is? The simplest way is to use the assembly instruction CPUID, that allows to get information about the processor. In our time, 64-bit processors are widely available at a very low cost, supported by Windows and Linux. In that time there were 64-bit processors of other companies - for example, 64-bit processor was used in the supercomputer Cray-1 since 1975 year. The first 32-bit processor was Intel 386. This type of microprocessors were produced by Intel and other manufacturers since 1985 year. Until the recent time there were only one type of microprocessor for Windows/Intel based computers - 32-bit. How to find out if your CPU is 32-bit or 64-bit
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