Code for double width characters on any HD44780 compatible display, need EEPROM ideas

Hello.
Below is my code which generates very nice looking, double width letters from 0 to 9, on any HD44780 compatible LCD module. Works well on LCD, OLED, VFD. Below I'm attaching the sample pictures.

Code:

---

DECODER 'DECODE DIGITS INTO PROPER SCREEN AREAS
LEFT=$40:RIGHT=$48 'SELECT ADDRESSES AS CUSTOM DIGITS ARE PLACED FROM LEFT TO RIGHT 0 TO 7
'1ST DIGIT
IF T1=0 THEN
GOSUB D0
ENDIF
IF T1=1 THEN
GOSUB D1
ENDIF
IF T1=2 THEN
GOSUB D2
ENDIF
IF T1=3 THEN
GOSUB D3
ENDIF
IF T1=4 THEN
GOSUB D4
ENDIF
IF T1=5 THEN
GOSUB D5
ENDIF
IF T1=6 THEN
GOSUB D6
ENDIF
IF T1=7 THEN
GOSUB D7
ENDIF
IF T1=8 THEN
GOSUB D8
ENDIF
IF T1=9 THEN
GOSUB D9
ENDIF


'2nd digit
LEFT=$50:RIGHT=$58
IF T2=0 THEN
GOSUB D0
ENDIF
IF T2=1 THEN
GOSUB D1
ENDIF
IF T2=2 THEN
GOSUB D2
ENDIF
IF T2=3 THEN
GOSUB D3
ENDIF
IF T2=4 THEN
GOSUB D4
ENDIF
IF T2=5 THEN
GOSUB D5
ENDIF
IF T2=6 THEN
GOSUB D6
ENDIF
IF T2=7 THEN
GOSUB D7
ENDIF
IF T2=8 THEN
GOSUB D8
ENDIF
IF T2=9 THEN
GOSUB D9
ENDIF


LEFT=$60:RIGHT=$68
'3rd digit
IF T3=0 THEN
GOSUB D0
ENDIF
IF T3=1 THEN
GOSUB D1
ENDIF
IF T3=2 THEN
GOSUB D2
ENDIF
IF T3=3 THEN
GOSUB D3
ENDIF
IF T3=4 THEN
GOSUB D4
ENDIF
IF T3=5 THEN
GOSUB D5
ENDIF
IF T3=6 THEN
GOSUB D6
ENDIF
IF T3=7 THEN
GOSUB D7
ENDIF
IF T3=8 THEN
GOSUB D8
ENDIF
IF T3=9 THEN
GOSUB D9
ENDIF


LEFT=$70:RIGHT=$78
'4th digit
IF T4=0 THEN


GOSUB D0
ENDIF
IF T4=1 THEN
GOSUB D1
ENDIF
IF T4=2 THEN
GOSUB D2
ENDIF
IF T4=3 THEN
GOSUB D3
ENDIF
IF T4=4 THEN
GOSUB D4
ENDIF
IF T4=5 THEN
GOSUB D5
ENDIF
IF T4=6 THEN
GOSUB D6
ENDIF
IF T4=7 THEN
GOSUB D7
ENDIF
IF T4=8 THEN
GOSUB D8
ENDIF
IF T4=9 THEN
GOSUB D9
ENDIF


RETURN
D0: 'decode into proper digit at proper location
LCDOUT $FE,LEFT,%01111,%11000,%11000,%11000,%11000,%11000,%01111,%0 '0L
LCDOUT $FE,RIGHT,%11110,%00011,%00011,%00011,%00011,%00011,%11110,%0 '0R
return
D1:
LCDOUT $FE,LEFT,%00001,%00011,%00110,%0,%0,%0,%00111'1L
LCDOUT $FE,RIGHT,%11000,%11000,%11000,%11000,%11000,%11000,%11111,%0        '1R
return
D2:
LCDOUT $FE,LEFT,%01111,%11000,%00000,%01111,%11000,%11000,%11111,%0        '2L
LCDOUT $FE,RIGHT,%11110,%00011,%00011,%11110,%00000,%00000,%11111,%0        '2R
return
D3:
LCDOUT $FE,LEFT,%01111,%11000,%00000,%00000,%00000,%11000,%01111,%0        '3L
LCDOUT $FE,RIGHT,%11110,%00011,%00011,%11110,%00011,%00011,%11110,%0        '3R
return
D4:
LCDOUT $FE,LEFT,%11000,%11000,%11000,%01111,%00000,%00000,%00000,%0        '4L
LCDOUT $FE,RIGHT,%00011,%00011,%00011,%11111,%00011,%00011,%00011,%0        '4R
return
D5:
LCDOUT $FE,LEFT,%11111,%11000,%11000,%11111,%00000,%11000,%01111,%0        '5L
LCDOUT $FE,RIGHT,%11111,%00000,%00000,%11110,%00011,%00011,%11110,%0        '5R
return
D6:
lcdout $FE,LEFT, %01111,%11000,%11000,%11111,%11000,%11000,%01111,%0        '6L
lcdout $FE,RIGHT, %11110,%00011,%00000,%11110,%00011,%00011,%11110,%0        '6R
return
D7:
lcdout $FE,LEFT, %11111,%11000,%00000,%00000,%00000,%00000,%00000,%0        '7L
lcdout $FE,RIGHT, %11111,%00011,%00011,%00011,%01110,%11000,%11000,%0'7R
return
D8:
lcdout $FE,LEFT, %01111,%11000,%11000,%01111,%11000,%11000,%01111,%0        '8L
lcdout $FE,RIGHT, %11110,%00011,%00011,%11110,%00011,%00011,%11110,%0        '8R
return
D9:
lcdout $FE,LEFT, %01111,%11000,%11000,%01111,%00000,%11000,%01111,%0        '9L
lcdout $FE,RIGHT, %11110,%00011,%00011,%11111,%00011,%00011,%11110,%0        '9R
return

---

To use this code, you need to place this string in your code (change starting position as needed):

Code:

---

lcdout $FE, $1, 0,1,2,3,4,5,6,7

---

Then assign to T1-T4 variables appropriate values and call the DECODER subroutine.

As you can see, this code uses 64 bytes of memory, to hold the visual data for bitmaps of digits 0-9.
However, I want to add whole ASCII charset + some extras, so that will require 256 bytes of memory (I want to have 128 characters, each needs 2x8 bytes of memory). I can use on-chip eeprom, but they're usually 256 bytes and I need them for some extras, so I plan to use external eeprom chip.

I want to have fast display update rate (at least 25 fps), so speed is critical. As far as I know, PBP does not support hardware I2C or SPI capabilities of PIC chips directly, you have to use assembly language, which is far above of my capabilities. So in software mode, can average PIC provide 64*25 bytes per second (that's 1.6kb/sec) reading data rate from external EEPROM ?

Attachment 9080
Attachment 9081

A cold LCD can't update smoothly at 25fps in fact 5fps would be a challenge.

Can you store the static LCD data in the PIC program flash memory using EXT instead of the eeprom.

http://dt.picbasic.co.uk/CODEX/TheEXTExternalModifier

Average 1602 LCD can do 20 FPS. Black on green (or white) are generally faster than white on blue. About 2-3 times faster. VATN LCD are even faster, but having same price as OLED, I see no point of using them.
OLED and VFD can do 60-100 FPS.
All tested with PBP. This is not an issue.

https://www.youtube.com/watch?v=jRG7m_4VE4U

https://www.youtube.com/watch?v=wGzZn8CFBqg