amberisvibin/chibi-pc09
Archived
1
0
Fork 1
Code Issues Pull Requests Activity

minimum functional bootcode

Browse Source
This commit is contained in:
Amber
2024-11-21 12:15:27 -05:00
parent dcc1bea405
commit cea8a54ebf
3 changed files with 31 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

BIN
code/boot/boot.bin
View File

Binary file not shown.

20
code/boot/boot.s
View File

@@ -24,9 +24,23 @@ SCR = UART + 7 ; Scratch Register (Not for control just spare RAM)
org $8000 org $8000
RESET: RESET:
sta $cc ; UART Setup
jmp RESET lda %11000001 ; 8n1 serial, enable DLAB
fdb RESET sta LCR
lda $00 ; Set divisor to 12 (9600 baud)
sta DLL
lda $0C
sta DLM
lda %11000000 ; 8n1 serial, disable DLAB
sta LCR
lda %01000000 ; Enable RTS
sta MCR
lda 'H ; send H
STA BUFR
; ENDSECTION ; ENDSECTION

5
code/boot/boot.s19
View File

@@ -1,5 +1,6 @@
S01800005B6C77746F6F6C7320342E32335D20626F6F742E73BF S01800005B6C77746F6F6C7320342E32335D20626F6F742E73BF
S10A800097CC7E8000800094 S113800096C1B77F039600B77F00960CB77F0196A1
S1118010C0B77F039640B77F049648B77F0041
S113FFF0000000000000000000000000000080007D S113FFF0000000000000000000000000000080007D
S5030002FA S5030003F9
S9030000FC S9030000FC