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1.6 Transient Commands CP/M Operating System Manual The assembler produces a file: X.PRN where X is the primary name specified in the ASM command. The PRN file contains a listing of the source program with embedded tab characters if present in the source program, along with the machine code generated for each statement and diagnostic error messages, if any. The PRN file is listed at the console using the TYPE command, or sent to a peripheral device using PIP (see Section 1.6.4). Note that the PRN file contains the original source program, augmented by miscellaneous assembly information in the leftmost 16 columns; for example, program addresses and hexadecimal machine code. The PRN file serves as a backup for the original source file. If the source file is accidentally removed or destroyed, the PRN file can be edited by removing the leftmost 16 characters of each line (see Section 2). This is done by issuing a single editor macro command. The resulting file is identical to the original source file and can be renamed from PRN to ASM for subsequent editing and assembly. The file A.HEX is also produced, which contains 8080 machine language in Intel HEX format suitable for subsequent loading and execution (see Section 1.6.3). For complete details of CP/M's assembly language program, see Section 3. The source file for assembly is taken from an alternate disk by prefixing the assembly language filename by a disk drive name. The command ASM B:ALPHA loads the assembler from the currently logged drive and processes the source program ALPHA.ASM on drive B. The HEX and PRN files are also placed on drive B in this case. 1-23
1.6 Transient Commands CP/M Operating System Manual 1.6.3 LOAD Command Syntax: LOAD ufn The LOAD command reads the file ufn, which is assumed to contain HEX format machine code, and produces a memory image file that can subsequently be executed. The filename ufn is assumed to be of the form: X.HEX and only the filename X need be specified in the command. The LOAD command creates a file named X.COM that marks it as containing machine executable code. The file is actually loaded into memory and executed when the user types the filename X immediately after the prompting character > printed by the CCP. Generally, the CCP reads the filename X following the prompting character and looks for a built-in function name. If no function name is found, the CCP searches the system disk directory for a file by the name X.COM If found, the machine code is loaded into the TPA, and the program executes. Thus, the user need only LOAD a hex file once; it can be subsequently executed any number of times by typing the primary name. This way, you can invent new commands in the CCP. Initialized disks contain the transient commands as COM files, which are optionally deleted. The operation takes place on an alternate drive if the filename is prefixed by a drive name. Thus, LOAD B:BETA brings the LOAD program into the TPA from the currently logged disk and operates on drive B after execution begins. 1-24
Page 1 and 2: The CP/M Editor CP/M Features and F
Page 3 and 4: 1 CP/M Features and Facilities Tabl
Page 5 and 6: 4 CP/M Dynamic Debugging Tool Table
Page 7 and 8: Table of Contents (continued) 3-7 D
Page 9 and 10: CP/M also supports ED, a powerful c
Page 11 and 12: 1.1 Introduction CP/M Operating Sys
Page 13 and 14: 1.2 Functional Description CP/M Ope
Page 15 and 16: 1.3 Switching Disks CP/M Operating
Page 17 and 18: 1.4 Built-in Commands CP/M Operatin
Page 19 and 20: 1.4 Built-in Commands CP/M Operatin
Page 21 and 22: 1.5 Line Editing and Output Control
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Page 53 and 54: 1.7 BDOS Error Messages CP/M Operat
Page 55 and 56: 1.8 Operation of CP/M on the MDS CP
Page 57 and 58: 2.1 Introduction to ED CP/M Operati
Page 73 and 74: 2.2 ED Error Conditions CP/M Operat
Page 75 and 76: 2.3 Control Characters and Commands
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Page 79 and 80: 3.1 Introduction CP/M Operating Sys
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3.2 Program Format CP/M Operating S
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3.3 Forming the Operand CP/M Operat
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3.4 Assembler Directives CP/M Opera
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3.5 Operation Codes CP/M Operating
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3.7 A Sample Session CP/M Operating
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Following the sign-on message, DDT
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4.1 Introduction CP/M Operating Sys
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4.2 DDT Commands CP/M Operating Sys
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4.4 A Sample Program CP/M Operating
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5.2 Call Conventions CP/M Operating
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5.3 A Sample Copy Program CP/M Oper
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5.3 A Sample Copy Program CP/M Oper
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5.4 A Sample File Dump Utility CP/M
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5.5 A Sample Random Access Program
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5.5 System Function Summary CP/M Op
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6.2 First-level Regeneration CP/M O
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6.2 First-level Regeneration CP/M O
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6.3 Second-level Regeneration CP/M
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6.3 Second-level Regeneration CP/M
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6.4 Sample GETSYS and PUTSYS CP/M O
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6.5 Disk Organization CP/M Operatin
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6.6 BIOS Entry Points CP/M Operatin
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6.7 A Sample BIOS CP/M Operating Sy
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6.9 Reserved Locations in Page Zero
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6.10 Disk Parameter Tables CP/M Ope
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6.11 The DISKDEF Macro Library CP/M
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Appendix A : The MDS-800 BIOS CP/M
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Appendix B : A Sekletal CBIOS CP/M
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Appendix C : A Skeletal GETSYS/PUTS
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Appendix D : MDS-800 Cold Start Loa
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Appendix D : MDS-800 Cold Start Loa
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Appendix E : A Skeletal Cold Start
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Appendix F : CP/M Disk Definition L
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Appendix G : Blocking and Deblockin
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Appendix H : Glossary CP/M Operatin
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Appendix I : CP/M Error Messages CP
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Index CP/M Operating System Manual
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Index CP/M Operating System Manual
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