Question about extEEPROM

[Dmitry Oleynikov]

Hi,
I am trying to make "hendheld" computer using your terminal-basic, as my hobby project. I took version 0.65 of sketch and changed it to work with my ZX-81-like keyboard and 1602 LCD on arduino nano. It's working, but it would be great to have support for i2c eeprom like 24c256 (32K). Unfortunately I have no C++ experience, so in most cases your code is like chinese philosofy books for me. Could you add this feature in one of next versions? Possibly just one module to write/read whole BASIC program memory at time to numbered area in EEPROM chip. So, to write current program to 3rd area, we say: SAVE 3. Same with LOAD 3 and CHAIN 3. No FORMAT and DELETE operation needed.
Thank you.

PS: logically area 0 could be internal EEPROM, which now is used by SAVE LOAD and so, without name, then areas from 1 to size of extEEPROM in external chip.

[Andrey Skvortsov]

It's worth to give a try to support I2C EEPROM modules.
but I propose slightly different command set:

• Language core commands, always available
  SAVE - save tokenized (non readable, but fast and compact) text to internal AVR EEPROM
  LOAD - load program from internal EEPROM, destroing the state (variables, arrays and stack)
  CHAIN - load program from internal EEPROM, preserving the state

• SDFS module commands
  DSAVE <filename expression=""> - save program on SD card as plain text file
  DLOAD <filename expression=""> - load program from SD card, destroing the state
  DCHAIN <filename expression=""> load program from SD card, preserving the state

• I2C external EEPROM module commands
  ESAVE <zone number="" (integer="" expression)=""> - save tokenized program to EEPROM zone
  ELOAD <zone number="" (integer="" expression)=""> - load program from EEPROM zone, destroing the state
  ECHAIN <zone number="" (integer="" expression)=""> - load program from EEPROM zone, preserving the state

ESAVE 0 equivalent SAVE
ELOAD 0 equivalent LOAD
ECHAIN 0 equivalent CHAIN

[Dmitry Oleynikov]

Sure , your point is the best one!

[Andrey Skvortsov]

SAVE, LOAD, CHAIN, DSAVE, DLOAD, DCHAIN are implemented since version 0.8.

[Andrey Skvortsov]

ESAVE, ELOAD, ECHAIN are available since 1.0-a1

ESAVE 0 equivalent SAVE
ELOAD 0 equivalent LOAD
ECHAIN 0 equivalent CHAIN

After rethinking I'v decided this is unnecessary and these constructs simply use first I2C EEPROM zone.