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create a RAM stub (at $C000) that user apps can use to detect presence of a banked out NB65 cart, and a routine to request banking the cart back in
git-svn-id: http://svn.code.sf.net/p/netboot65/code@91 93682198-c243-4bdb-bd91-e943c89aac3b
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@ -71,7 +71,7 @@ nb65_param_buffer: .res $20
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.word init ;cold start vector
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.word $FE47 ;warm start vector
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.byte $C3,$C2,$CD,$38,$30 ; "CBM80"
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.byte "NB65" ;netboot 65 signature
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.byte $4E,$42,$36,$35 ; "NB65" - API signature
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jmp nb65_dispatcher ; NB65_DISPATCH_VECTOR : entry point for NB65 functions
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jmp ip65_process ;NB65_PERIODIC_PROCESSING_VECTOR : routine to be periodically called to check for arrival of ethernet packects
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jmp timer_vbl_handler ;NB65_VBL_VECTOR : routine to be called during each vertical blank interrupt
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@ -104,7 +104,16 @@ init:
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ldax #__DATA_SIZE__
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jsr copymem
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;copy the RAM stub to RAM
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ldax #nb65_ram_stub
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stax copy_src
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ldax #NB65_RAM_STUB_SIGNATURE
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stax copy_dest
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ldax #nb65_ram_stub_length
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jsr copymem
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ldax #startup_msg
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jsr print
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@ -340,3 +349,11 @@ no_files_on_server:
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press_a_key_to_continue:
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.byte "PRESS A KEY TO CONTINUE",13,0
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nb65_ram_stub: ; this gets copied to $C000 so programs can bank in the cartridge
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.byte $4E,$42,$36,$35 ; "NB65" - API signature
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lda #$01
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sta $de00 ;turns on RR cartridge (since it will have been banked out when exiting to BASIC)
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rts
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nb65_ram_stub_end:
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nb65_ram_stub_length=nb65_ram_stub_end-nb65_ram_stub
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@ -2,10 +2,13 @@
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NB65_API_VERSION=$0001
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NB65_CART_SIGNATURE = $8009
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NB65_DISPATCH_VECTOR = $800d
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NB65_PERIODIC_PROCESSING_VECTOR = $8010
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NB65_VBL_VECTOR = $8013
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NB65_RAM_STUB_SIGNATURE = $C000
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NB65_RAM_STUB_ACTIVATE = $C004
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;function numbers
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;to make a function call:
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@ -63,16 +63,41 @@ basicstub:
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@nextline:
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.word 0
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look_for_signature: ;look for NB65 signature at location pointed at by AX
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stax temp_ptr
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ldy #3
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@check_one_byte:
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lda (temp_ptr),y
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cmp nb65_signature,y
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bne @bad_match
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dey
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bpl@check_one_byte
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clc
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rts
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@bad_match:
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sec
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rts
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init:
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lda #$01
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sta $de00 ;turns on RR cartridge (since it will have been banked out when exiting to BASIC)
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ldy #NB65_GET_DRIVER_NAME
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jsr NB65_DISPATCH_VECTOR
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ldax #NB65_CART_SIGNATURE ;where signature should be in cartridge
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jsr look_for_signature
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bcc @found_nb65_signature
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ldax #NB65_RAM_STUB_SIGNATURE ;where signature should be in RAM
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jsr look_for_signature
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bcc :+
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jmp nb65_signature_not_found
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:
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jsr NB65_RAM_STUB_ACTIVATE ;we need to turn on NB65 cartridge
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ldy #NB65_PRINT_ASCIIZ
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jsr NB65_DISPATCH_VECTOR
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@found_nb65_signature:
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call #NB65_GET_DRIVER_NAME
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call #NB65_PRINT_ASCIIZ
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print #initializing
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@ -216,6 +241,7 @@ udp_callback:
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bad_boot:
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print #press_a_key_to_continue
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restart:
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jsr get_key
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jmp $fce2 ;do a cold start
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@ -227,6 +253,17 @@ print_errorcode:
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print_cr
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rts
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nb65_signature_not_found:
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ldy #0
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:
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lda nb65_signature_not_found_message,y
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beq restart
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jsr print_a
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iny
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jmp :-
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;use C64 Kernel ROM function to read a key
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;inputs: none
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;outputs: A contains ASCII value of key just pressed
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@ -277,6 +314,9 @@ failed:
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ok:
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.byte "OK ", 0
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nb65_signature_not_found_message:
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.byte "NO NB65 API FOUND",13,"PRESS ANY KEY TO RESET", 0
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dns_lookup_failed_msg:
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.byte "DNS LOOKUP FAILED", 0
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@ -284,3 +324,6 @@ reply_message:
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.byte "PONG!"
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reply_message_end:
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reply_message_length=reply_message_end-reply_message
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nb65_signature:
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.byte $4E,$42,$36,$35 ; "NB65" - API signature
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