Jan,

Well, I've been a fan of BASIC52 for more years than I care to recall. I found this LCD on the surplus marketplace in the US - http://www.btinternet.com/~e2one/lcd/index.htm - I liked it so much that I bought quite a few.

It has a single 8032, importantly with 'socketed' PLCC32 flash and lots of XRAM. The guys at pjrc.com developed 8051 assembler to have it act as a VT100 device.

A couple of yrs ago, I ported BASIC52 onto this with the PRINT@ writing to the LCD. So, only one 8032 device doing the whole job. I've designed a backboard PCB to hold 7805, max232, serial EEPROM (for BASIC52 code), an I2C PPE and a DS1307 with battery backup.

The last bit, that I didn't finish, is support for a couple of DS1820s. Also have some PC software to allow screens to be designed & rules written to drive the PPE I/O lines. This program generates BASIC-52 for downloading to and standalone execution on the LCD panel.

My extra commands are via the 'ORG 2002H, DB 5AH' technique. Parameter passing as in the Elektor I2C implementation.

Great work from you on the RD2 - I've often looked at all the tubes of DS5000s that live in my basement & thought of good BASIC52 things that might be done.

I'm firmly from the era where every last byte of code space had to work hard - yes, the guys at Intel did a great job of fitting such an interpreter into 8K.

Cheers,
Derek.