On 1/28/26 2:20 AM, Joshua O'Keefe wrote:
On Jan 27, 2026, at 7:31 PM, B 9 <[email protected]> wrote:
A while ago, I saw a fabulous disassembly of the Model-T ROMs, with
conditional parts for each of the different family members.
You're probably thinking of
https://github.com/z88dk/techdocs/blob/master/targets/m100/m100.asm
And from my Model 100 disassembly from VirtualT:
; ======================================================
; Redraw SCREEN from LCD RAM
; ======================================================
4601H (CDH) CALL 73C5H ; Turn off background task, blink &
reinitialize cursor blink time
4604H (2EH) MVI L,01H ; Prepare to point to LCD RAM (1,1)
4606H (26H) MVI H,01H ; "
4608H (CDH) CALL 4512H ; Get character at (H,L) from LCD RAM)
460BH (CDH) CALL 4566H ; Call Level 6 Character Draw routine
460EH (24H) INR H ; Increment column
460FH (7CH) MOV A,H ; Prepare to test for column 40
4610H (FEH) CPI 29H ; Test if beyond column 40
4612H (C2H) JNZ 4608H ; Jump if more columns on this line
4615H (2CH) INR L ; Increment line
4616H (7DH) MOV A,L ; Prepare to test if last line refreshed
4617H (FEH) CPI 09H ; Test if beyond line 8
4619H (C2H) JNZ 4606H ; Jump back to refresh next line if not on
line 9
461CH (C3H) JMP 433BH ; Get Cursor ROW,COL in DE and start cursor
blinking if cursor on
