MZ-1ARM18 is a simple replacement of SHARP RAM disks MZ-1R18 and MZ-1R12 for SHARP MZ-800, MZ-700* or MZ-1500 computers.

It has the same features as the original MZ-1R18 RAM disk, but contains an additional 64 kB of RAM (128 kB total) that can be paged or used seperately. The MZ-1ARM18 RAM disk can also emulate the S-RAM disk MZ-1R12 (without backup), allowing faster program loading. It can be used in conjunction with UniCMT for faster loading of the file manager or for fast transfer of programs to BASIC.

There are 2 firmware options:

• page switching using port $E9, both RAM disks (MZ-1R18 and MZ-1R12) share the same 128 kB memory space
  • this is common for larger RAM drives manufactured in Europe
  • the $E9 port on the MZ-1500 conflicts with the port for writing to both sound chips at the same time, which can have an unexpected effects on the MZ-1500's functionality
  • this is a recommended option for European SHARP MZ-800
• separate memory spaces
  • emulation of MZ-1R18 RAM disk has its own 64 kB of RAM
  • emulation of MZ-1R12 SRAM disk (without RAM backup) has the other 64 kB
  • this is a recommended option for MZ-1500

A later change is possible if you own the STLINK programmer or a clone of it. For users who have purchased a RAM disk from us, we will allow you to download new updated firmware versions.

*Use in the MZ-700 requires an adapter or external box, such as the MZ-1U06.