Virgin

Found on:
"3-D Pinball"
"Aaargh!"
"Action Force"
"Advanced Basketball Simulator"
"Alcazar"
"Barry McGuigan World Championship Boxing"
"Bombfusion"
"Continental Circus"
"Cricket Captain"
"Dan Dare"
"Dan Dare II"
"Double Dragon II"
"F.A. Cup Football"
"Hacker"
"Hacker II"
"Jonah Barrington's Squash"
"Little Computer People"
"Manic Miner"
"Motorbike Madness"
"Pulsoid"
"Rad Ramp Racer"
"Rescue on Fractalus!"
"Speed Zone"
"Super Nudge 2000"
"T-Bird"
"Trans-Atlantic Balloon Challenge"
"Xenon"

Loader files:
ROM Header
Turbo loader
ROM Data
Autostart

Encoding:
Endianess:MSbF
Threshold:0x015e
Lead-in:255 x 0xAA
Sync:0xA0
Byte:8 bits
0-bit:Short

Structure:
Header:Yes
Checksum:Yes
Header:
00        ??, Compared with value in Data area
01        $d011 value
02-03   Load start address (Low/high order)
04-05   Load end address (Low/high order)
06-07   Start address

Checksum:
EOR of all data bytes (header bytes not included). Byte after data is checksum.

Lead-in:
There always seems to be a 0x07 or 0x37 preceeding the sync bytes.