TY  - BOOK
AU  - Penfold,R.A.
AU  - Penfold,J.W.
TI  - An introduction to 6502 machine code
SN  - 0859341224
U1  - QA/76.8.S63 
PY  - 1984///
CY  - Shepherds bush road, London
PB  - Bernard Babani pub.Ltd.
KW  - 6502 (Microprocessor) -- Programming.
ER  -