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#Haskell chipmunk basic interpreter software
#Haskell chipmunk basic interpreter code
#Haskell chipmunk basic interpreter Pc

Format 1: Consists of 8 bits of allocated memory to store instructions.Each format has a different representation in memory: The instruction formats provide a model for memory and data The Simplified Instruction Computer has three instruction formats, and the Extra EquipmentĪdd-on includes a fourth.

#Haskell chipmunk basic interpreter software

In the System Software book, this is used with a theoretical series of operation codes to aid in the understanding ofĪssemblers and linker-loaders required for the execution of assembly language code. These five/nine registers allow the SIC or SIC/XE machine to perform most simple tasks in a customized assembly language.F (6): Floating point accumulator register (This register is 48-bits instead of 24).T (5): No special use, general purpose register.S (4): No special use, general purpose register.B (3): Used for addressing know as the base register.In addition to the standard SIC registers, there are also four additional general-purpose registers specific to the SIC/XE.

SW (9): Contains a variety of information, such as carry or overflow flags known as the status word register.

#Haskell chipmunk basic interpreter Pc

PC (8): Contains the address of the next instruction to execute known as the program counter register.L (2): Used for jumping to specific memory addresses and storing return addresses known as the linkage register.

X (1): Stores and calculates addresses known as the index register.

A (0): Used for basic arithmetic operations known as the accumulator register.

SIC machines have several registers, each 24 bits long and having both a numeric and character representation:.

#Haskell chipmunk basic interpreter code

All SIC assembly code is upwards compatible with SIC/XE. Of 32,768 bytes) to the original machine. SIC adds a 48-bit floating point data type, an additional memory addressing mode, and extra memory (1 megabyte instead Machine built on top of SIC called the Simplified Instruction Computer with Extra Equipment (SIC/XE). The SIC machineĭoes not support floating-point hardware and have at most 32,768 bytes of memory. Numeric values are stored as word values, and character values use the 8-bit ASCII system. Any three consecutive bytes form a 24-bit 'word' value, addressed by the location of the lowest numbered byte in Memory storage in SIC consists of 8-bit bytes, and all memory addresses in SIC are byteĪddresses.

Similar to most modernĬomputing systems, the SIC architecture stores all data in binary and uses the two's complement to represent negative The SIC machine has basic addressing, storing most memory addresses hexadecimal integer format.Simplified Instructional Computer solves this byĪbstracting away these complex behaviors in favor ofĪn architecture that is clear and accessible for those Systems programming using a real-world system. The purposes of efficiency, it can be difficult to learn Microprocessors include subtle, complex functions for Software: An Introduction to Systems Programming, by Hypothetical computer system introduced in System