diff --git a/client/clients/rrnetboot.s b/client/clients/rrnetboot.s
index 5376c67..25c7d5f 100644
--- a/client/clients/rrnetboot.s
+++ b/client/clients/rrnetboot.s
@@ -1,4 +1,4 @@
-;#############
+; #############
 ; 
 ; This will boot a C64 with RR-NET from the network
 ; requires
@@ -9,18 +9,17 @@
 ; jonno@jamtronix.com - January 2009
 ;
 
-RRNETBOOT_IP65_DISPATCHER = $800d 
-RRNETBOOT_IP65_PROCESS =$8010
-RRNETBOOT_IP65_VBL =$8013
-
-
+NB65_DISPATCH_VECTOR = $800d 
+NB65_PERIODIC_PROCESSING_VECTOR =$8010
+NB65_VBL_VECTOR =$8013
 
+  .include "../inc/nb65_constants.i"
   .include "../inc/common.i"
   .include "../inc/commonprint.i"
   .include "../inc/menu.i"
   .include "../inc/net.i"
   .include "../inc/c64keycodes.i"
-  .include "../inc/ip65_function_numbers.i"
+  
   .import cls
   .import get_key
   .import beep
@@ -45,22 +44,22 @@ RRNETBOOT_IP65_VBL =$8013
   .import  __DATA_SIZE__
 
 	.bss
-
-;temp_bin: .res 1
-;temp_bcd: .res 2
+  
+ip65_param_buffer: .res $10  
 
 bin_file_jmp: .res 3
 tftp_dir_buffer: .res 2000
 
 
+
 .segment "CARTRIDGE_HEADER"
 .word init  ;cold start vector
 .word init  ;warm start vector
 .byte $C3,$C2,$CD,$38,$30 ; "CBM80"
 .byte "NB65"  ;netboot 65 signature
-jmp ip65_dispatcher    ; RRNETBOOT_IP65_DISPATCHER   : entry point for IP65 functions
-jmp ip65_process          ;RRNETBOOT_IP65_PROCESS : routine to be periodically called to check for arrival of ethernet packects
-jmp timer_vbl_handler     ;RRNETBOOT_IP65_VBL : routine to be called during each vertical blank interrupt
+jmp ip65_dispatcher    ; NB65_DISPATCH_VECTOR   : entry point for IP65 functions
+jmp ip65_process          ;NB65_PERIODIC_PROCESSING_VECTOR : routine to be periodically called to check for arrival of ethernet packects
+jmp timer_vbl_handler     ;NB65_VBL_VECTOR : routine to be called during each vertical blank interrupt
 
 .data
 jmp_old_irq:
@@ -71,7 +70,7 @@ jmp_old_irq:
   
 
 irq_handler:
-  jsr RRNETBOOT_IP65_VBL
+  jsr NB65_VBL_VECTOR
   jmp jmp_old_irq
 
 remove_irq_handler:
@@ -131,9 +130,14 @@ init:
 
 @tftp_boot:  
 
-print_driver_init
-  ldy #FN_IP65_INIT
-  jsr RRNETBOOT_IP65_DISPATCHER 
+  ldy #NB65_GET_DRIVER_NAME
+  jsr NB65_DISPATCH_VECTOR 
+  jsr print
+  ldax #init_msg
+	jsr print
+  
+  ldy #NB65_INIT_IP
+  jsr NB65_DISPATCH_VECTOR 
 
 	bcc :+
   print_failed
@@ -144,8 +148,8 @@ print_driver_init
   
   print_dhcp_init
   
-  ldy #FN_DHCP_INIT
-  jsr RRNETBOOT_IP65_DISPATCHER 
+  ldy #NB65_INIT_DHCP
+  jsr NB65_DISPATCH_VECTOR 
 	bcc :+  
 	print_failed
   jmp bad_boot
@@ -154,7 +158,7 @@ print_driver_init
 
   jsr print_ip_config
 
-    ldx #3
+  ldx #3
 : 
   lda cfg_tftp_server,x
   sta tftp_ip,x
diff --git a/client/inc/commonprint.i b/client/inc/commonprint.i
index 09b875c..631f4c6 100644
--- a/client/inc/commonprint.i
+++ b/client/inc/commonprint.i
@@ -1,4 +1,8 @@
-	.zeropage
+.ifndef NB65_API_VERSION
+.include "../inc/nb65_constants.i"
+.endif
+
+.zeropage
 pptr:		.res 2
 .bss
 temp_bin: .res 1
@@ -38,41 +42,66 @@ temp_bcd: .res 2
 .import print_a
 .import print_cr
 .import cs_driver_name
-
+.import cfg_get_configuration_ptr
 print_ip_config:
+  
+
   ldax #ip_address_msg
   jsr print
-  ldax #cfg_ip
+  jsr cfg_get_configuration_ptr ;ax=base config, carry flag clear
+  adc #NB65_CFG_IP
+  bcc :+
+  inx
+:  
   jsr print_dotted_quad
   jsr print_cr
 
   ldax #netmask_msg
   jsr print
-  ldax #cfg_netmask
+   jsr cfg_get_configuration_ptr ;ax=base config, carry flag clear
+  adc #NB65_CFG_NETMASK
+  bcc :+
+  inx
+: 
   jsr print_dotted_quad
   jsr print_cr
 
   ldax #gateway_msg
   jsr print
-  ldax #cfg_gateway
+  jsr cfg_get_configuration_ptr ;ax=base config, carry flag clear
+  adc #NB65_CFG_GATEWAY
+  bcc :+
+  inx
+:
   jsr print_dotted_quad
   jsr print_cr
 
   ldax #dns_server_msg
   jsr print
-  ldax #cfg_dns
-  jsr print_dotted_quad
+  jsr cfg_get_configuration_ptr ;ax=base config, carry flag clear
+  adc #NB65_CFG_DNS_SERVER
+  bcc :+
+  inx
+:  jsr print_dotted_quad
   jsr print_cr
 
   ldax #dhcp_server_msg
   jsr print
-  ldax #dhcp_server
+  jsr cfg_get_configuration_ptr ;ax=base config, carry flag clear
+  adc #NB65_CFG_DHCP_SERVER
+  bcc :+
+  inx
+:
   jsr print_dotted_quad
   jsr print_cr
 
   ldax #tftp_server_msg
   jsr print
-  ldax #cfg_tftp_server
+  jsr cfg_get_configuration_ptr ;ax=base config, carry flag clear
+  adc #NB65_CFG_TFTP_SERVER
+  bcc :+
+  inx
+:
   jsr print_dotted_quad
   jsr print_cr
 
diff --git a/client/inc/nb65_constants.i b/client/inc/nb65_constants.i
new file mode 100644
index 0000000..49f57a8
--- /dev/null
+++ b/client/inc/nb65_constants.i
@@ -0,0 +1,17 @@
+
+NB65_API_VERSION=$0001
+
+;offsets in NB65 configuration structure
+NB65_CFG_MAC        = $00                       ;6 byte MAC address
+NB65_CFG_IP         = NB65_CFG_MAC+$06          ;4 byte local IP address (will be overwritten by DHCP)
+NB65_CFG_NETMASK    = NB65_CFG_IP+$04           ;4 byte local netmask (will be overwritten by DHCP)
+NB65_CFG_GATEWAY    = NB65_CFG_NETMASK+$04      ;4 byte local gateway (will be overwritten by DHCP)
+NB65_CFG_DNS_SERVER = NB65_CFG_GATEWAY+$04      ;4 byte IP address of DNS server (will be overwritten by DHCP)
+NB65_CFG_TFTP_SERVER = NB65_CFG_DNS_SERVER+$04  ;4 byte IP address of TFTP server (can be broadcast address e.g. 255.255.255.255)
+NB65_CFG_DHCP_SERVER = NB65_CFG_TFTP_SERVER+$04 ;4 byte IP address of DHCP server (will only be set by DHCP initialisation)
+
+NB65_GET_API_VERSION      =0 ;no inputs, outputs  X=major version number, A=minor version number
+NB65_GET_DRIVER_NAME      =1 ;no inputs, AX=pointer to asciiz driver name
+NB65_GET_IP_CONFIG_PTR    =2 ;no inputs, AX=pointer to IP configuration structure (which can be modified)
+NB65_INIT_IP              =3 ;no inputs or outputs
+NB65_INIT_DHCP            =4 ;no inputs or outputs
diff --git a/client/ip65/config.s b/client/ip65/config.s
index 22ff5d7..14edefb 100644
--- a/client/ip65/config.s
+++ b/client/ip65/config.s
@@ -1,5 +1,7 @@
 ;IP configuration defaults
 ;most of these will be overwritten if dhcp is used for configuration
+
+.include "../inc/common.i"
 
 	.export cfg_mac
 	.export cfg_ip
@@ -7,6 +9,22 @@
 	.export cfg_gateway
 	.export cfg_dns
   .export cfg_tftp_server
+  .export cfg_get_configuration_ptr
+  .export dhcp_server 
+  
+.code
+
+;return a pointer to where the IP configuration is kept
+;this is really only useful for the NB65 API - for anything
+;linking directly against ip65, you would just import the
+;address of the individual configuration elements, rather
+;than use a base pointer+offsets to find each item.
+;inputs: none
+;outputs: AX = pointer to IP configuration.
+cfg_get_configuration_ptr:  
+  ldax  #cfg_mac
+  clc
+  rts
   
 .data	
 
@@ -18,4 +36,4 @@ cfg_netmask:	.byte 255, 255, 255, 0; netmask of local network (will be overwritt
 cfg_gateway:	.byte 0, 0, 0, 0 ;ip address of router on local network (will be overwritten if dhcp_init is called)
 cfg_dns:	.byte 0, 0, 0, 0; ip address of dns server to use (will be overwritten if dhcp_init is called)
 cfg_tftp_server: .byte $ff,$ff,$ff,$ff ; ip address of server to send tftp requests to (can be a broadcast address)
-  
\ No newline at end of file
+dhcp_server: .res 4   ;will be set address of dhcp server that configuration was obtained from
\ No newline at end of file
diff --git a/client/ip65/function_dispatcher.s b/client/ip65/function_dispatcher.s
index 50d1c60..dee5a01 100644
--- a/client/ip65/function_dispatcher.s
+++ b/client/ip65/function_dispatcher.s
@@ -1,8 +1,11 @@
-.include "../inc/ip65_function_numbers.i"
+
+.include "../inc/nb65_constants.i"
+.include "../inc/common.i"
 
 .import ip65_init
 .import dhcp_init
-
+.import cs_driver_name
+.import cfg_get_configuration_ptr
 .export ip65_dispatcher
 
 
@@ -10,12 +13,31 @@
 
 ip65_dispatcher:
 
-  cpy #FN_IP65_INIT
+  cpy #NB65_GET_API_VERSION
+  bne :+
+  ldax  #NB65_API_VERSION
+  clc
+  rts
+:
+
+  cpy #NB65_GET_DRIVER_NAME
+  bne :+
+  ldax  #cs_driver_name
+  clc
+  rts
+:
+
+  cpy #NB65_GET_IP_CONFIG_PTR
+  bne :+
+  jmp cfg_get_configuration_ptr
+:
+
+  cpy #NB65_INIT_IP
   bne :+
   jmp ip65_init
 :
 
-  cpy #FN_DHCP_INIT
+  cpy #NB65_INIT_DHCP
   bne :+
   jmp dhcp_init
 :