New CX5M owner with no MSX experience: quick n00b question

Por Soft Automaton

Rookie (26)

Imagen del Soft Automaton

24-03-2021, 21:59

Hi everyone,

I'm brand new to the forum and just got an MSX for the first time yesterday. Mine came with several cartridges plus the rear slot adapter and a UDC-01 memory cartridge too.

I have a very quick question since I'm also new to BASIC. How can look into the memory cartridge and view its contents? The battery may be dead but I just want to see what's on it. I have no idea what the commands are to access it. The cartridge was a Yamaha sales rep's demo content so I hope to retrieve it if it's still there.

Any help would be great. Thank you!

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Por Manuel

Ascended (18240)

Imagen del Manuel

24-03-2021, 22:20

Apparently the UDC-01 is identical to the Sony HBI-55, which has the manual here: https://archive.org/details/HitBitHBI55

Basically, it says you can do LOAD"CAT:" to load a basic program from the cartridge. But you didn't tell me what kind of data should be in the cartridge. If it's data particular for one of the Yamaha programs, you'll have to access it from that program.

Por Soft Automaton

Rookie (26)

Imagen del Soft Automaton

25-03-2021, 02:23

Hi Manuel - thank you for the quick reply! Downloading the manual now.

I don't know what's on the cartridge at all, actually. It wasn't mine. I thought there was a command to search or view all files. I saw a reference to "Unknown" somewhere but I can 't remember what it was.

Por hamlet

Scribe (3728)

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25-03-2021, 06:22

The datacartridge only can host one program at one time. So there is no need for a directrory. Wink
As Manuel mentioned, LOAD"CAT:" should load a existing BASIC program. You already mentioned that the battery may be down, so there would be nothing to find.

Por Soft Automaton

Rookie (26)

Imagen del Soft Automaton

25-03-2021, 16:07

OK great to know. Thank you for that!

Just so I understand:

  • If the battery is still good, I could type in LOAD"CAT:" and it should load up the program but you're saying that there is no way to see what the contents actually are. I don't have a file name or extension; it isn't information I have. I currently assume that it may be a saved file from another Yamaha program. It may be a composition score or a macro. I just don't know.
  • It is likely that the battery is bad, however, in which case the contents are just gone and I can consider the cartridge "blank". I would then replace the battery and consider it 'fresh'.

I'm really hoping to find a way to retrieve its contents RAW but it sounds like it doesn't quite work like this if you don't know what program it's associated to.

Por hamlet

Scribe (3728)

Imagen del hamlet

25-03-2021, 16:42

Exactly. I do have Cartridges I bought in 1985 which still hold the datas, others I had to change the battery years ago.
Yamaha programs that used the cart for savings are listed here.
No big deal to change the battery with that type.

Por st1mpy

Paladin (838)

Imagen del st1mpy

25-03-2021, 16:46

If you want to write a basic program to dump sram contents, Info in this page is enough to write a basic program. Just don't do the save part, as that would destroy the data before reading.

Por Soft Automaton

Rookie (26)

Imagen del Soft Automaton

26-03-2021, 14:15

Great links, both of them. That Yamaha list is in line with how I think it may have been used by this rep back when these came out. A few of those cartridges were included.

I will definitely give this data dump a go if the battery checks out. I'll just need to get read up on the code before I do anything!

Do you know, off hand, if the resulting dump is truly RAW? I'd like to know how to re-interpret it, then figure out how to save it somewhere. I did buy a MEGAROM / SD so I'll be trying to save it there eventually. I just don't have it here yet and of course it will need to be formatted and prepped.

Thank you both!