---
name: "srec_cosmac"
section: "5"
platform: "linux"
package: "srecord"
version: "1.64-4.1+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/srec_cosmac"
---

# srec\_cosmac(5)

RCA Cosmac Elf file format

## NAME

srec\_cosmac - RCA Cosmac Elf file format

## DESCRIPTION

This file takes the form of one or more RCA Cosmac Elf monitor commands, also known as the IDIOT/4 monitor. Only the change memory command (`!M`) is allowed.

The general form of the `!M` command takes the form

!M*aaaa* *dd* ... *dd*

The `!M` command writes data byte bytes (represented by character pairs *dd*) into successive memory locations, started at address *aaaa*. Spaces between data bytes are ignored.

Using the comma (`,`) line continuation character resumes from the next address in sequence.

!M*aaaa* *dd* ... *dd*, *dd* ... *dd*

Using the semicolon (`;`) line continuation character takes an address on the next line

!M*aaaa* *dd* ... *dd*; *aaaa* *dd* ... *dd*

It is also possible to have the semicolon immediately after the command.

!M; *aaaa* *dd* ... *dd*

All of these forms may be used in combination.

### Size Multiplier

In general, binary data will expand in size by approximately 2.0 times when represented with this format.\

## EXAMPLE

Here is an example Cosmac file. It contains the data “Hello, World\[rq\] to be loaded at address 0x1000.

```
!M1000 48656C6C6F2C20576F726C640A
```

## COPYRIGHT

*srec\_cat* version 1.64\
 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 Peter Miller\

The *srec\_cat* program comes with ABSOLUTELY NO WARRANTY; for details use the '*srec\_cat -VERSion License*' command. This is free software and you are welcome to redistribute it under certain conditions; for details use the '*srec\_cat -VERSion License*' command.\

## MAINTAINER

| | | |
| --- | --- | --- |
| Scott Finneran | E‐Mail: | scottfinneran@yahoo.com.au |
| Peter Miller | E‐Mail: | pmiller@opensource.org.au |