Assuming the default config fuses in the 16f628.inc could be commented, I would bet on...
Now there's still the pull-up on MCLR and on RA.4 which have to be there, but you said it worked in 4-bit mode, so...Code:@ DEVICE pic16F628, INTRC_OSC_NOCLKOUT, LVP_OFF, PWRT_ON
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