. l ▁and ▁Table ▁D . 2 , ▁provides ▁information ▁d BASE ▁for ▁D OS ▁uses ▁to ▁maintain ▁the ▁database ▁file . ▁ ▁Database ▁records ▁ ▁The ▁records ▁follow ▁the ▁header ▁in ▁the ▁database ▁file . ▁Data ▁records ▁are ▁preced ed ▁by ▁one ▁byte : ▁a ▁space ▁( 0 x 2 0 ) ▁if ▁the ▁record ▁is ▁not ▁deleted , ▁or ▁an ▁a ster isk ▁( 0 x 2 A ) ▁if ▁the ▁record ▁is ▁deleted . ▁Field s ▁are ▁pack ed ▁into ▁records ▁without ▁field ▁separ ators ▁or ▁record ▁termin ators . ▁The ▁end ▁of ▁the ▁file ▁is ▁marked ▁by ▁a ▁single ▁byte ▁ 0 x 1 A . ▁ ▁You ▁can ▁input ▁ASCII ▁data ▁as ▁indicated ▁in ▁the ▁following ▁table . ▁ ▁Mem o ▁fields ▁and ▁the ▁. DB T ▁file ▁▁ ▁A ▁mem o ▁(. DB T ) ▁file ▁consists ▁of ▁blocks ▁number ed ▁sequ entially ▁( 0 , 1 , 2 , ▁and ▁so ▁on ). ▁SET ▁B LOCK SIZE ▁determ ines ▁the ▁size ▁of ▁each ▁block . ▁The ▁first ▁block ▁in ▁the ▁mem o ▁file , ▁block ▁ 0 , ▁is ▁the ▁mem o ▁file ▁header . ▁ ▁Each ▁mem o ▁field ▁of ▁each ▁record ▁in ▁the ▁. DB F ▁file ▁contains ▁the ▁number ▁of ▁the ▁block ▁( in ▁ASCII ) ▁where ▁the ▁mem o ▁field ▁begins . ▁If ▁the ▁mem o ▁field ▁contains ▁no ▁data , ▁the ▁. DB F ▁file ▁contains ▁bl anks ▁( 0 x 2 0 ) ▁rather ▁than ▁a ▁number . ▁ ▁When