b800.org - pastebin for B800 Video buffer screenshots, with focus on iPXE
Quick iPXE script: params && param vram ${vram} && chain -a http://b800.org##params && echo b800.org/${b800id} usage details

Information about the B800 memory segment

See The conversion page for examples on converting.
Technical details about the B800 CGA/VGA memory, Video Memory Layouts, BIOS Data Area