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

# srec\_fairchild(5)

Fairchild Fairbug file format

## NAME

srec\_fairchild - Fairchild Fairbug file format

## DESCRIPTION

The Fairchild Fairbug format has 8‐byte records. A file begins with an address record and ends with an end‐of‐file record.

There are three record types in this file format.

Address records are of the form

| | |
| --- | --- |
| `S` | *nnnn* |

indicating the address for the following data records.

Data records are of the form

| | | |
| --- | --- | --- |
| `X` | *ffffffffffffffff* | *c* |

Each data record begins with an X and always contains 8 data bytes. The *ff* characters are hexadecimal byte values (8 bytes). Each data byte is represented by 2 hexadecimal characters. The *c* character is a hex digit being the the nibble‐sum of the data bytes. A 1‐digit hexadecimal checksum follows the data in each data record. The checksum represents, in hexadecimal notation, the sum of the binary equivalents of the 16 digits in the record; the half carry from the fourth bit is ignored. The programmer ignores any character (except for address characters and the asterisk character, which terminates the data transfer) between a checksum and the start character of the next data record. This space can be used for comments.

The end‐of‐file record has the form

| |
| --- |
| `*` |

The last record consists of an asterisk only, which indicates the end of file.

### Size Multiplier

In general, binary data will expand in sized by approximately 2.4 times when represented with this format.\

## EXAMPLE

Here is an example Fairchild Fairbug file. It contains the data “Hello, World\[rq\] to be loaded at address 0x1000. Notice how the last record is padded with 0xFF bytes.

```
S1000
X48656C6C6F2C2057C
X6F726C64210AFFFF3
*
```

## 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 |