ftp.barnyard.co.uk/2015.02.ftp.barnyard.co.uk.tar/ftp.barnyard.co.uk/cpm/walnut-creek-CDROM/ENTERPRS/C128/TEXT/C128ROM.128

Text File | 2000-06-30 | 6KB | 194 lines

!         -----------------
!         C-128 ROM-I/O-MAP
!         -----------------
!
!         By James Hermann
!            74576.711
!
!With Help From-
!             Allen Yoder/SCOPE-Texas
!             Dave Haynie/Commodore
!                  76703.2047
!
!0000*        8502 On-Chip D-D Register
!0001*        8502 On-Chip I/O Register
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!4000-7FFF    BASIC Low ROM or
!             Internal Low ROM or
!             External Low ROM.
! 4000-       BASIC Power-up JMP $4023
! 4003-       BASIC RESET JMP $4009
! 4023-4044   BASIC Power-up
! 4045-410F   Init. BASIC registers
! 4112-4179   Init. BASIC Abs. Var.
! 417A-418C   Initalize D501-4
! 419B-41BA   Print RESET Screen
! 41BB-4250   RESET Screen Header Char.
! 4251-4278   Init. 0300-11;02FC
! 4279-43DD   BASIC CHRGET ML
! 430D-       Tokenize BASIC Text
! 4417-4515   BASIC 2.0 Keywords
! 4516-46F8   BASIC 7.0 Keywords
! 484B-4A81   BASIC Error Meassages
! 4AA2-       BASIC Char. Dispatch
! 4D3F-       Print BASIC Message
! 4DC6-       BASIC Warm Start
! 5151-       BASIC Text LIST
! 51D9-5261   Init. BASIC Pgm vectors
! 6EB2-6EDA   Init. BASIC Abs. Var.
! 78DA-       BASIC Token Eval.
! 7E82-7FFD   Blank
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!8000-BFFF    BASIC Mid ROM or
!             Internal ROM or
!             External ROM.
! 9251-9298   BASIC to KERNAL JMP Table
! A845-A84C   To BANK(15)
! AA6E-AE62   Blank
! AFA8-AFFF   Blank
! B000-BFFF   Moniter ROM
!  BOOO-      Moniter RST code
!  B003-      BRK
!  BB72-BFFD  Blank
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!C000-CFFF    Editor High ROM or
!             Internal ROM or
!             External ROM.
! C000-       CINT -JMP $C07B
! C00F-       SCREEN
! C012-       SCNKEY
! C018-       PLOT
! C07B-       CINT
! CEA8-CEF4   Function Key Init. values
! CEF5-CFFD   Blank
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!D000-DFFF    I/O Space
! D500-D50B   MMU I/O chip(switchable)
!  D500       MMU Config. Reg. ($FF00)
!  D501-D504  MMU Preconfig. Registers
!  D505       bit 7 - 40/80 switch 1=40
!             bit 6 - 128/64 mode 1=64
!             bit 5 - GAME line; bi-dir
!             bit 4 - EXROM line; bi-d
!             bit 3 - Fast Serial I/O
!             bit 1-2 - reserved
!             bit 0 -8502/Z80 CPU 0=Z80
!  D506       RAM Config. Register
!             bits 0-1 -K of Common RAM
!                  00-1K     01-4K
!                  10-8K     11-16K
!             bits 2-3 -Loc./Common RAM
!                  00-none   01-Bottom
!                  10-Top    11-Both
!             bits 4-5 -reserved
!             bit 6 -RAM # used by VIC
!             bit 7 -reserved
!  D507       Page for CPU Zero Page
!  D508       LSB-RAM # for CPU ZP
!  D509       Page for CPU stack
!  D50A       LSB-RAM # for CPU stack
!  D50B       System Version Register
!             bits 0-3 -MMU chip vers.
!             bits 4-7 -Code for K/RAM
!                  0010- 128K
!                  0000- 256K
! D50C-D5FF   Blank
! D600-D601   Access to 16K display RAM
!  D600       Register addresses
!  D601       Data
! DC00-DCFF   CIA #1 (Keyboard; etc.)
! DD00-DDFF   CIA #2 (Serial; etc.)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!E000-FFFF    KERNAL High ROM
! E000-       KERNAL ROM Code
!  E000-E048  RST Code
!  E04B-E055  $D500 Init. values
!  E056-      RESTORE
!  E05B-      VECTOR
!  E093-      RAMTAS
!  E0CD-E108  Init.$FF05- on RAM(0-3) &
!             KERNAL RAM Code on RAM(0)
!  E109-E1EF  IOINIT routine
!  E1F0-E223  If $FFF5-9 on RAM(1)=cbm,
!             then JMP ($FFF8);else...
!  E224-E241  Init. $FFF5-9 on RAM(1)
!  E242-E2BF  Switch to 64 mode if D505
!             bits 4-5 not set; check
!             Int./Ext. ROM and JMP
!   E24B-E26A Switch to 64 mode
!  E33B-      TALK
!  E33E-      LISTEN
!  E43E-      ACPTR
!  E4D2-      SECOND
!  E4E0-      TKSA
!  E503-      CIOUT
!  E515-      UNTLK
!  E526-      UNLSN
!  F23D-F264  Close all files on dev=ac
!  F265-      LOAD
!  F53E-      SAVE
!  F5F8-      UDTIM
!  F63D-F65D  Check for CTRL R/S or C=
!  F65E-      RDTIM
!  F665-      SETTIM
!  F6B1-F71D  KERNAL Messages
!  F731-      SETNAM
!  F738-      SETLFS
!  F744-      READST
!  F75C-      SETMSG
!  F75F-      SETTMO
!  F763-      MEMTOP
!  F772-      MEMBOT
!  F781-      IOBASE
!  F7D0-F7D9  Call KERNAL RAM Code 02A2
!             to LDA byte from addr;y
!             at Zero-Page vector in
!             acc for BANK(x)
!  F7EC-F7EF  LDA MMU value for BANK(x)
!  F7F0-F7FF  MMU values for BANK(0-15)
!  F800-F859  KERNAL RAM Code $02A2-FB
!  F85A-F866  KERNAL RAM Code $03F0-FC
!  F867-F988  Check for ROM not used
              on RST ; Load Boot Page
              and execute
!  F9D5-F9FA  Load page and STA($ACC)
! FA00-       Editor Tables
!  FA17-FA3F  Print bytes after JSR
!  FA40-      NMI
!  FA65-      IRQ
!  FC3B-FC7F  Blank
! FC80-FEFF   Foreign Lang. Sys.-Blank
!FF00*        MMU Config. Register
!FF01-FF04*   MMU Load Config. Regs.
! FF05-FF44   KERNAL Int. Dispatch Code
!  FF3D-FF44  RST Code JMP $E000
! FF47-FF80   KERNAL Hardware JMP Table
! FF81-FFF5   KERNAL User Jump Table
! FFFA-FFFF   NMI;RST; and IRQ vectors
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!* These are I/O registers and take the
!   place of RAM or ROM always.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!MMU Configuration Register $D500/FF00
!   bits    values    purpose
!   6-7  RAM control-
!             00   RAM(0)
!             01   RAM(1)
!             10   RAM(2)-not present
!             11   RAM(3)-not present
!   4-5  ROM control-
!             00   KERNAL and EDIT ROM
!             01   Internal High ROM
!             10   External High ROM
!             11   None
!   2-3  Mid ROM control- $8000-BFFF
!             00   BASIC ROM
!             01   Internal ROM
!             10   External ROM
!             11   None
!   1    Low ROM Control- $4000-7FFF
!             0=ROM     1=RAM
!   0    I/O-ROM Control- $D000-DFFF
!             0=I/O     1=CHAR-ROM

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