Acorn NFS 3.34 Memory Map

← Acorn NFS and Acorn ANFS

Addresses outside the ROM used by Acorn NFS 3.34 at run time — zero-page workspace, RAM buffers, and memory-mapped I/O. For the ROM code itself (&8000–&9FFF), see the disassembly listing.

Access: R read, W write, B indexing base — the address is named as base,X/,Y, so the byte actually touched is base + index and the literal byte at this address is never itself accessed.

Zero page

Address	Name	Access
`&0002`	`zp_work_2`	B
`&0003`	`zp_work_3`	B
`&00AE`	`work_ae`	B
`&00AF`	`addr_work`	B
`&00C2`	`txcb_dest`	B
`&00C7`	`txcb_pos`	B

Stack

Address	Name	Access
`&0100`	`error_block`	B
`&0101`	`error_text`	B
`&0102`	`stack_page_2`	B
`&0103`	`stack_page_3`	B
`&0104`	`stack_page_4`	B
`&0106`	`stack_page_6`	B
`&0130`	`osword_param_block`	B

RAM workspace

Address	Name	Access
`&0700`	`string_buf`	B
`&0CFF`	`nmi_code_base`	B
`&0D1A`	`nmi_shim_1a`	B
`&0D1E`	`tx_addr_base`	B
`&0D26`	`tx_data_start`	B
`&0D41`	`rx_remote_addr`	B
`&0D58`	`exec_addr_lo`	B
`&0DDA`	`nmi_ws_substitute`	B
`&0DEB`	`fs_state_deb`	B
`&0DFE`	`fs_context_base`	B
`&0E0A`	`fs_cmd_context`	B
`&0EF7`	`fs_reply_data`	B
`&0F0D`	`fs_file_len`	B
`&0FC5`	`parse_char_out_base`	B
`&0FC6`	`cr_terminator_base`	B
`&0FE0`	`fs_error_buf`	B