32K RAM
The COMX 32K RAM card places additional RAM from address @C000 to @DFFF, i.e. only one 8KB bank of the available 32K at a time. To switch to a different 8K bank the OUT 1 instruction should be used. Bit 5 and 6 were used for the RAM bank selection (bit 1 to 4 were used for the expansion box slot selection, see also I/O Map).
For use of the RAM card with expansion box command please see the Expansion Box page.
When using the Ram Card the RAM will not be available as normal BASIC RAM, i.e. PRINT MEM will still only show 30934 Bytes.