Computer Architecture - Software - Lesson 13 - Printers, Mac OS and Linux - Eric Vanderburg

1. Computer Architecture:
OS Technologies
Chapter 13
Printers, Mac OS & Linux
Eric Vanderburg
Eric Vanderburg – OS Technologies © 2005

2. Review (Printers)
• Sharing a printer
– How to
– Permissions
– DOS LPT & PRN commands
• Connecting to a shared printer
– Network Neighborhood
– AD
Eric Vanderburg – OS Technologies © 2005

3. Windows Printing Process
1. User prints from app
2. App contacts GDI (Graphical Device
Eric Vanderburg – OS Technologies © 2005
Interface)
3. GDI contacts print driver for printer
info, renders (combines printer info
& document)
4. GDI sends rendered job to the print
spooler
5. Client side spooler contacts server
side spooler
6. Server side spooler contacts print
router

4. Printing Process
(continued) 7. Print router determines if the printer is
local or remote.
a. Local: job forwarded to local print provider
b. Remote: finds remote print provider for that
print server & that print provider sends the
data to the print server local print provider
7. Local print provider finds a print
processor that can process the print job
8. Print processor contacts GDI for further
rendering (if required)
9. Print processor sends job to separator
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processor
10.Job is sent to the port monitor which is
connected to the printer.

5. Mac OS Startup
• ROM self test
• Settings are pulled from PRAM (Parameter
RAM)
• Bootable disk is located
• Active system folder is found
• Mac OS ROM file is loaded
• Mac icon displays as system files,
libraries, and kernel is loaded
• Drivers (enablers) are loaded for devices
• Disk first aid runs if bad shut down
• Control panels are loaded
• Desktop displayed
• Finder and startup apps loaded
Eric Vanderburg – OS Technologies © 2005

6. Mac Components
• Dock
• Finder
• Spotlight
• Widgets
• Expose
• Apple menu
• Apps share a menu bar
• Notification area in upper right
• No registry
Eric Vanderburg – OS Technologies © 2005

7. File System
• HFS (Hierarchical File System)
• HFS+ - Mac Extended Format
• Blocks instead of clusters
• Can mount FAT16 & FAT32 drives
• Can read NTFS & Linux partitions with
apps
• Components
– boot blocks – location of system folder (like
boot record)
– Volume info block – size block size, name, ect
– Volume bit map (which blocks are used)
– Catalog tree – database of files & permissions
– Extents tree – links for additional blocks called
extents
Eric Vanderburg – OS Technologies © 2005

8. Other info
• System is defragged when new
software is installed
• Disk First Aid is like checkdisk
• Drive Setup can format
• Linux apps can run on Mac OS
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9. Linux
• Root is starting point, not drives
• More logical in nature instead of physical
• Shells – command line interfaces –
different support for commands, scripting
languages
– Echo $shell – shows current shell
• Text editors
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– Vi
– Emacs
• GUIs
– Gnome
– KDE

10. Folders
• /bin – programs and commands
• /boot – boot loaders and boot files
• /dev – device config files
• /etc – config data for users, system settings, and
services
• /home – user data
• /lib – libraries – code modules
• /lost+found – orphaned files
• /mnt – mounted volumes
• /opt – other program files
• /root – home directory for root
• /sbin – admin commands
• /tmp – temp files
• /usr – linux file system (read only)
• /var – email, news, print spools, admin files
Eric Vanderburg – OS Technologies © 2005

11. Commands
• See pg 578-580
Eric Vanderburg – OS Technologies © 2005