The following hardware and software is recommended for using Microsoft's MASM version 6.12:

• Hardware
  • Intel486™ processor-based system (Pentium^®, Pentium Pro, or Pentium II processor-based system recommended)
  • 16 megabytes RAM (32 megabytes RAM recommended)
• Software
  • Microsoft* Windows* 95 or Windows NT*
  • MASM version 6.11d. The 6.12 patch must be installed for MASM support of MMX technology assembly language coding. MASM version 6.11d can be obtained from the Microsoft Windows NT Device Driver Kit (DDK) or directly from Microsoft. See the MMX Technology Programmer's Reference Manual for a description of the MMX instruction set and mnemonics supported by MASM version 6.12.