VPW Protocol Info:

http://www.fastfieros.com/tech/vpw_communication_protocol.htm

VPW Wire Format Info:

http://www.interfacebus.com/Automotive_SAE_J1850_Bus.html

http://auto-diagnostics.info/j1850

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.506.6682&rep=rep1&type=pdf

Motorola 68k programmer's reference manual:

https://www.nxp.com/docs/en/reference-manual/M68000PRM.pdf - instruction set summary on pages 72-104