CP2

File Format
Name	CP2
Ontology	Electronic File Formats Disk Image Formats CP2
Extension(s)	.cp2

CP2 is a disk image format created by the commercial disk copier Copy-II-PC in conjunction with a separate program, Snatch-It.

Identification

The first 24 bytes of the file are ASCII 'SOFTWARE PIRATESRelease '.

File structure

Files begin with a 30-byte header:

+0x00  DB  'SOFTWARE Pirates'
+0x10  DB  'Release '
+0x18  DB  release (printable ASCII)
+0x1C  DB  '$'
+0x1D  DB  volume number (ASCII, starting with '0')

Following the header will be one or more segments, each 64k or less in size. A segment is formed:

+0x00  DW  segment header length, little-endian word.
+0x02  DB  cylinder
+0x03  DB  head
+0x04  DB  sector
+0x05      Sector headers, 384 bytes per track.
       DW  length of sector data
       DB  sector data

The length

A sector header is 16 bytes:

+0x00  DB  read result
+0x01  DB  8272 status register 0
+0x02  DB  8272 status register 1
+0x03  DB  8272 status register 2
+0x04  DB  Sector ID: cylinder
+0x05  DB  Sector ID: head
+0x06  DB  Sector ID: sector
+0x07  DB  Sector ID: size (0 for 128 bytes, 1 for 256 bytes, 2 for 512 bytes etc.)
+0x08  DW  Offset to sector data from start of sector data area + 0x16AD

To find the actual offset of a sector in the file, take its offset value in the header, subtract 0x16AD, and add the segment header length +

Software

• [h ttps://github.com/retrohun/pce/blob/master/src/drivers/psi/psi-img-cp2.c PCE] contains some code to parse .CP2 disk images.

Sample files

• ht tps://discmaster.textfiles.com/browse/29984/wbiz0000-0009/wbiz0008.tar/wbiz0008