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Programming
Model of 8086

 

Data
Registers:

          15                           8              7                              0

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AX

BX

CX

DX

               

AH

AL

BH

BL

CH

CL

Dh

DL

     

 

·        
Four 16-bit general purpose registers
used to store operands and results.

·        
Each can be accessed as a whole (AX,
BX, CX & DX)
or the upper and lower bytes can be accessed separately (AL, AH, BL, CL, CH, DL
& DH).

·        
AX is an implied operand for some
arithmetic operations.

·        
BX may be used as a base register in address
calculations.

·        
CX is an implied counter for certain
instructions.

·        
DX is sometimes used to hold the address
of I/O instructions.

 

 

Segment
Registers:

            15                                            0

                  CS

                  SS

                  DS 

                  ES  

 

·        
Used
to calculate physical memory addresses.

·        
CS
(Code Segment) is used in combination with IP to access the executing program
instructions.

·        
SS
(Stack Segment) is used in combination with SP to access the executing program
Stack.

·        
DS
(Data Segment) and ES (Extra Segment) are used to access the executing program
data.

Physical
Address.

 

 

·        
The
Segment, Pointer and other addressing registers are only 16 bits wide. On the
other hand, the address put on the bus by the 8086 (called Physical Address) is
20-bits. So, where do the missing 4-bits come from?

 

 

         
16bit

Effective Address or Offset

                                                                   +

          
16bit

Segment Address 

                                                       =

                   20bits

Physical Address          

 

 

Example:
(CS) = 123A, (IP) = 341B

Therefore,
next instruction fetched at:

 

   341B
Offset

+
123A0 Segment Address

=
157BB
Physical Address

Categories: Data

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INDUCTION
CHECKLIST

 

Prior to
the employee commencing employment:

 

o  told the employee before their first day where, when and who they
should report to including a contact number

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o  organised building and computer access

o  provided a Coffeeville branded shirt.

o  received a signed copy of the employment contract

o  a completed Tax file number declaration document

o  a completed Superannuation form

o  the employee’s bank account details for remuneration payment

o  the employee’s emergency contact / next of kin details

o  a copy of identification i.e. drivers licence and passport or
birth certificate

o  provided a copy of the Fair Work Information Statement

 

On the
first day:

To ensure the employee
feels welcome and comfortable, it’s important to provide information on the
Business and other information required for the role.

 

Orientation and housekeeping:

o  Introduce the new employee to other staff including their
designated ‘buddy’

o  Show the Employee the kitchen/break area, toilets and lockers

o  Show the Employee the emergency muster point and what to do in an
emergency

Ensure you have:

o  Given the employee copies of all Coffeeville policies and procedures
including relevant legislations

 

o  It is important to discuss with the Employee:

§  the background of the Business and its
objectives

§  who the employee will report to

§  the employee’s responsibilities including the
tasks required to complete the role

§  any applicable training that will take place
and when this will occur

§  performance expectations and how performance is
managed

§  hours required to work including the length of
meal breaks and when they should be taken

§  the award or agreement that the role is covered
within

§  remuneration payment dates and how payslips
will be distributed

o  completed a workplace health and safety induction and signed the
appropriate form

Categories: Business

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