The new 16 k memory-card This card was launched in 1984. The card is a dubbel-sided print. The components are indicated by means of a silkscreen print. Expanding the memory was an important objective. Loading programs again and again from a tape recorder on 300 baud was tedious. Keeping your data under write-protect in Ram was a relief. Battery Backup Pin 24 from all memory ICs is connected to the battery back-up circuit. When the Atom is connected to the power supply it starts feeding these ICs. However, when the Atom is switched off and a battery is mounted ± 2,6 volt is sufficient to secure the contents of the chips. The layout. 
The Components.
Write Protect
The ICs 6, 7 and 8 are on the print already part of the Write Protect circuit. Pin 21 from these ICs is connected to switch number 6 from the dipswitch device. The pins 21 from ICs 1 until 5 may be connected to the dipswitches 1 t/m 5. There are "islands" available for that purpose. If a FDC for the Atom was available for a modest price, there would probably be hardly any necessity for WP anymore.
 
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