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Comment: Updating OZ


Z88 Applications

When the Z88 came out, there was no facility to 'Blow your own ROM,' This was because the Z88 Application software was supplied on an EPROM card. As larger EPROM cards became available, it was possible to make compilations but there were only a few people around who had the skills to link the applications together, writing addresses on the back of envelopes and using Hex calculators. This all changed when Garry Lancaster wrote ROMcombiner. This allowed users to combine applications themselves. When the Flash cards become available, blowing those were added, so at lastfor example, all the applications that were written for the Z88 could be written stored onto one 1M card.

Now that all the companies that wrote software for the Z88 are no longer marketing their products it is now possible to download the ROM image and blow your own.

Updating Applications and OZ

Updating Flash cards came next with ROMupdate. Fetching the new image from the internet and downloading to the Z88, allows users to update the applications and OZ versions themselves. From OZ 4.7 this facility was added, allowing the Z88 Operating System to update itself. 



Slot 1 needs to have at least 128K and at least enough RAM to store the image.

128K is enough to space to store Eazylink and Flashstore, but not enough to store an OZ 4.5update.

OZ 4.5 requires at least 256K.

Ideally if If you are running OZ 4.5 or above in slot 1, with 512K of RAM, that is may enough RAM to store most images.

OZ 4.5 also has Eazylink installed on it so the additional Computer link pop-down is may not be required.

Slot 2 may have another EPROM or Flash card with the Computer Link in it
A blank EPROM or Flash Card to store the applications or files.
(Optional) EPROM Eraser to erase the EPROM card (if required).

Connecting the Z88 to the Desktop to transfer the programs to the Z88.

See Computer Links for more details


  • Save Eazylink ROM to the Flashcard
  • Download the Files to RAM
  • Delete the Eazylink image from the Flash card.
  • Save the OZ image from RAM to the Flash card.

Create / Update OZ


Check List

Before doing a procedure like this it is prudent to do some preliminary checks.



The standard Z88 does not recognise the file area.


If the values shown in the RAM do not display these values, Backup the Z88 and give the Z88 a Hard Reset.


The examples given here are

Application / Pop-down  

Creating Eazylink/Flashstore  

Use your 32K EPROM (this can be a MAC LINK or PC LINK card) and EPROM ERASER to build Eazylink fot transfer, rather than the slower Imp/Export route. Alternatively, use the Flash card temporarily, until the OZ image replaces it.

Creating OZ  

Update your existing copy or build one from scratch.
Creating SpellMaster  

An example of building a 3rd party software.


If you're a developer, we have all you need too, just read the Developer's Notes on our wiki,  (applies to all Z88 ROM releases, including OZ v4.5).