We'll assume the picture dimensions are width * height x bpp (where bpp means bits per pixel).
File Header
The total length of the header is 7 bytes
| Byte 00 | Must be &HFD (253) to be a valid BSAVE file |
| Bytes 01 to 02 | Segment where the datas were stored in memory before using BSAVE |
| Bytes 03 to 04 | Offset where the datas were stored in memory before using BSAVE |
| Bytes 05 to 06 | width*height*(bpp/8)+5 : Size of the array stored in the file + 5 |
Memory Dump of the buffer got using GET command
| Bytes 07 to 08 | width*bpp | Bytes 09 to 10 | height | Bytes 11 to 11+width*height*(bpp/8) | Color indexes map got using GET command |
Checksum
Last byte : This is a kind of checksum. I have no more information about this byte but it appears to depend on the picture dimensions.
Note: All number in this document are written in decimal
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