User manual COMPAQ DESKPRO EX ILLUSTRATED PARTS MAP

[. . . ] © 2001 Compaq Computer Corporation. Compaq Deskpro EX and EXS Illustrated Parts Map Compaq Deskpro EX and EXS Series of Personal Computers Minitower Models Compaq, the Compaq logo, and Deskpro are trademarks of Compaq Information Technologies Group, L. P. Intel, Pentium, and Celeron are trademarks of Intel Corporation in the United States and other countries. All other product names mentioned herein may be trademarks of their respective companies. Compaq shall not be liable for technical or editorial errors or omissions contained herein. [. . . ] Cmd Word 1 register, Master PIC ICW2 Init. Cmd Word 2 register, and Master PIC ICW3 Init. Cmd Word 3 register Aliased at 20h-21h Counter 0 interval time status byte format and Counter 0 counter access port register Counter 1 interval time status byte format and Counter 1 counter access port register Counter 2 interval time status byte format and Counter 2 counter access port register Timer control word register, Timer control word register read back. and Counter latch command Aliased at 40h-43h NMI status and control register NMI enable register and Real-time clock (Standard RAM) index register Real-time clock (Standard RAM) target register Extended RAM index register Extended RAM target register Aliased at 70h-71h Aliased at 72h-73h or 70h-71h Channel 2, 3, 1 DMA memory low page register Reserved page registers Channel 6, 7, 5 DMA memory low page register Reserved page registers Refresh low page register Aliased at 81h-8Fh Fast A20 and INIT register Reset control register Slave PIC ICW1 Init. cmd word 1 register, Slave PIC OCW2 Init. cmd word 2 register, and Slave PIC 0CW3 Init. cmd word 3 register Slave PIC ICW2 Init. cmd word 2 register, Slave PIC ICW3 Init. cmd word 3 register, Slave PIC ICW4 Init. cmd word 4 register, and Slave PIC OCW1 Init. cmd word 1 register Refer to the Computer Setup (F10 Setup) instructions to establish new passwords. *When the CMOS button is pushed or the jumper is removed, both the power-on password and the setup password become invalid because both are stored in the configuration memory. You will need to reset the passwords The computer's configuration (CMOS) may occasionally be corrupted. If it does, it is necessary to clear the CMOS memory using jumper SW50 To clear and reset the configuration, perform the following procedure: 1. [. . . ] Locate the header and jumper labeled E49. Place the jumper over pin 2 only, in order to avoid losing it. Plug in the computer and turn on power to all equipment. [. . . ]