xprog must be high lines

[immokiller]

hi i want to know the meaning of ''optional must be high and optional must be low that is written in xprog eeprom and mcu programmer pdf manual

i am so tired i tried to program an mc68hco8 with no vail

every time it tells me that the device is silent

also the write read icons are grayed out i am so stuck

i connected my xprog as told in manual i am trying to access a mercedes benz immobilizer and trying to to read its mc68h in circuit ....it must be those ''must be low '' statements that i misinterpreted any help is appreciated


thanks

[smokey08]

The must be low pins have to be ground and if there not you must connect them to ground. Same for the must be high, If there not got power on them pins then you must connect power to them.

Your buttons are greyed out because you need to click the new icon in the top left corner.

[immokiller]

thanks despte the fact that i am very late

in saying it