Acer Altos R310 Altos R310 Service Guide - Page 61

Checkpoint Code 33h 34h 36h 38h 3Ah 3Ch 3Dh 41h 42h 45h 46h 47h 48h 49h 4Ah 4Bh 4Ch 55 Beep Code 1-4-2-1 2-1-2-3 Description Initialize the Phoenix Dispatch Manager. CMOS test. Vector to proper shutdown routine. Shadow the system BIOS. Autosize external cache and program cache size for enabling later in POST. If CMOS is valid, load chipset registers with values from CMOS, otherwise load defaults and display Setup prompt. If Auto Configu-ration is enabled, always load the chipset registers with the Setup defaults. Load alternate registers with CMOS values. Register-table pointers are in the altreg-table segment. Initialize extended memory for RomPilot. Initialize interrupt vectors 0 thru 77h to the BIOS general interrupt handler. Initialize all motherboard devices. Verify the ROM copyright notice Initialize support for I2O by initializing glo-bal variables used by the I2O code. Pause POST table processing if a CMOS bit is set (for debugging). Verify that the equipment specified in the CMOS matches the hardware currently installed. If the monitor type is set to 00 then a video ROM must exist. If the monitor type is 1 or 2 set the video switch to CGA. If monitor type 3, set the video switch to mono. Also specify in the equipment bytethat disk drives are installed. Set appropri-ate status bits in CMOS or the BDA if configuration errors are found. Perform these tasks: 1. Size the PCI bus topology and set bridge bus numbers 2. Set the system max bus number 3. Write a 0 to the command register of every PCI device 4. Write a 0 to all 6 base registers in every PCI device 5. Write a -1 to the status register of every PCI device 6. Find all IOPs and initialize them. Initialize all video adapters in system. Initialize QuietBoot if it is installed. Enable both keyboard and timer interrupts (IRQ0 and IRQ1). If your POST tasks require interrupts off, preserve them with a PUSHF and CLI at the beginning and a POPF at the end. If you change the PIC, preserve the existing bits. Shadow video BIOS ROM if specified by Setup, and CMOS is valid and the previous boot was OK. Altos R310