CAP-X

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CAP-X is an assembly language for the imaginary computer architecture COMP-X that had been adopted for Japan Information Technology Engineers Examination since the first examination in 1970 until the language got replaced by CASL in 1985.

Specifications for COMP-X

This section is translated from Wikipedia article.

Uses 16-bit 2's complement integer for data word and address word. Word unit addresses. Most significant bit is bit 0; least significant bit is bit 15.

Registers

General-purpose registers GR0-GR3
16 bits. For arithmetic and bitwise operations and indexing effective address (GR1-GR3 only).
Base register BR
Stores top 8 bits of effective address; 0 is set for bottom 8 bits.
Sequence counter SC
Aka program counter. Stores currently executing address.
Conditional code register CC
1 bit. Indicates signness of result of last arithmetic operation.

Operation structure

Every operators has 1 word, and consists of these fields from significant bits:

  1. 4 bits of OP field to specify operation kind;
  2. 2 bits of GR field to specify operand register;
  3. 2 bits of XR field to modify address; and
  4. 8 bits of AD field to specify bottom 8 bits of effective address.
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Examples

Stores sum of four items in label IA to GR0 (with WRITE command): 

IA  CONST 0001
    CONST 0003
    CONST 0005
    CONST 0009
S   LAI   0,0
    LAI   1,0
B01 ADD   0,IA,1
    LAI   1,1,1
    LAI   3,252,1
    JNZ   3,B01
    WRITE 0,10
    HJ    0,Á
    END   S

Implementation

Z80 assembly implementation available, as well as four additional commands as extension on page 87-96 on 工学社, I/O 昭和55年5月号, ISSN 0337-6675

Bibliography

See also

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