What is this clone?

[KatManDEW]

Anyone recognize this clone? Is there any software, or hardware ad-on's for it?

[sirmorris]

If it's a clone then yes, there's quite a bit of software for it

Having said that, by the looks of the keyboard I would say there is some differences here. Note the symbols on the number keys.

[sirmorris]

A quick trip to old-computers.com, search for 'sinclair' and I think we have a hit:

http://www.old-computers.com/museum/com ... t=1&c=1271

The TONEL PC is another system based on the Lambda 8300 but marketed by another third company. It's a Sinclair ZX-81 with more RAM (2 KB!) and a "better" keyboard...

[KatManDEW]

Yep That's it! Thanks. I bookmarked that site.

Wonder what they mean by "With its modified ROM, the PC-8300 was only ZX-81 compatible with Basic programs. But soon, a ZX-81 ROM was available to turn your system into a real Sinclair ZX-81 machine, being able to run all software including machine code."?

[wilf_zx]

The 8300 ROM was not compatible with MC programs that used ZX81 ROM subroutines. In addition the expansion connector is missing some signals (busreq, busack?) The 8300 video subsystem is also different using a separate character ROM in the ULA and makes it incompatible with hires software. You can't just swap the 8300 ROM with a ZX81 ROM becase it uses different video routines. Fred Nachbaur designed a replacement ROM for the 8300 that is compatible with most MC programs by putting all subroutines in their proper place. He added a enhanced BREAK function and WARM RESET plus Inew BASIC keywords like NPUT and OUTPUT functions to peek and poke I/O addresses. Although I have an 8300, I (probably) lost my copy of that enhanced ROM image.

wilf

[XavSnap]

Yes...
The shifted keys don't match with the Zx81 rom !