Saving to Cassette on Casio Z-1GR?

[Duane Hess]

Using my feeble brain, tried to remember cassette tape usage on the original Apple II, IBM 5150 PC and other older machines I have used, for comparison. Originally was going to suggest dropping a filename altogether. But you did that and got an error.

As I recall once diskette drives came out a lot of manufacturers dropped cassette support. I'm not familiar with Casio's, so have no idea.

Some machines used CLOAD and CSAVE with or without quoted filenames. Those without, you had to remember where on the tape the file was.

A couple of sources on the net might be useful to you:
-- https://manualzz.com/doc/2011217/basic-comparison-sheet
which covers the syntax of BASIC on a bunch of different machines.

The comparison sheet makes reference to (via link-click, not direct URL string):
-- http://www.mvcsys.de/doc/casioutil.html#mozTocId992705
a website by Marcus vonCube, the same as on here, I believe. The link gives you stuff in English, but his website is in German. However, it has an English version button.

His file states the Z-1 and FX-890P lack a tape interface. However, by using a bas850 source text translator (a program he provides on his site?) you can use cassettes via a serial or USB interface. Whether those interfaces utilize the FA-6, it didn't mention. But I didn't read the whole thing.

Marcus's site has a bunch of BASIC stuff, which is where the comparison sheet appears to come from.

Maybe that helps.