H:\DATA-R~1\PIC\PBP244>pbp -p12f629 zd
PicBasic Pro Compiler 2.44, (c) 1998, 2003 microEngineering Labs, Inc.
All Rights Reserved.
PM Assembler 4.06, Copyright (c) 1995, 2003 microEngineering Labs, Inc.
Error H:\DATA-R~1\PIC\PBP244\ZD.ASM 44 : [225] Undefined Symbol 'ADCON1'
Error H:\DATA-R~1\PIC\PBP244\ZD.ASM 44 : [225] Undefined Symbol 'ADCON1'
Error H:\DATA-R~1\PIC\PBP244\ZD.ASM 44 : [225] Undefined Symbol 'ADCON1'
Error H:\DATA-R~1\PIC\PBP244\ZD.ASM 44 : [225] Undefined Symbol 'ADCON1'
Error H:\DATA-R~1\PIC\PBP244\ZD.ASM 44 : [225] Undefined Symbol 'ADCON1'
*** 5 Errors ***

H:\DATA-R~1\PIC\PBP244>

zd.bas is the source file I pasted your code into.