====== CBM PET 40xx / CBM 40xx series (1980) ======


===== Features =====

  * CPU: 6502 1 MHz
  * RAM: 16 or 32 KB
  * ROM: 20 KB
  * Text Modes: 40 columns x 25 lines, upgradeable  to 80 columns
  * Graphic Modes: None
  * Colors: Monochrome
  * Sound: Programmable piezo buzzer
  * I/O Ports: IEEE 488, I/O ports (8), Tape (2)
  * Keyboard: QWERTY full-stroke keyboard
  * Built In Language: Commodore Basic 4.0


===== Usage =====

MESS emulates the following computers

  * cbm40 [Commodore 40xx FAT (CRTC, 60Hz)]
  * cbm40pal [Commodore 40xx FAT (CRTC, 50Hz)]
  * cbm40b [Commodore 40xx THIN (Business Keyboard)]

For each systems, MESS supports 

  - two datasettes, using "cassette1" (cass1) and "cassette2" (cass2) devices, for tapes in .tap and .wav format (currently not working)
  - two cart slots, "cartridge1" (cart1) and "cartridge2" (cart2), for cart dumps in .crt, .a0 and .b0 format
  - two floppy drives, "floppydisk1" (flop1) and "floppydisk2" (flop2), for disk images in .d64 format.

Also notice that a "quickload" (quik) feature is available for .p00 and .prg files.

== Keyboard ==

These systems require full keyboard emulation to work correctly. At startup, full keyboard emulation mode is enabled by default. Whilst in full keyboard emulation mode, some key associated functionality may be disabled (like the <key>Esc</key> key for EXIT). The keyboard emulation mode is toggled using the <key>Scrl Lock</key> key (by default).

Original Keyboard: QWERTY full-stroke keyboard
  
                                                                             CRSR  STOP
      <-   1!   2"   3#   4$   5%   6&   7'   8(   9)   0     :*   -=   UP    L/R   RUN           7   8   9
  
                                                                          CRSR    DEL
      TAB    Q    W    E    R    T     Y    U    I    O    P    [    \    U/D    INST             4   5   6
  
  	 SHIFT
  ESC   LOCK   A    S    D    F     G     H    J    K    L   ;+    @     ]      RETURN            1   2   3
  
  RVS                                                                                HOME
  OFF   SHIFT     Z    X    C    V    B     N    M    ,<   .>   /?   SHIFT   REPEAT   CLR           0     .
  
  
                                     SPACEBAR

== RAM options ==

Different RAM configurations are possible for these systems in MESS. You can switch between them, changing the -ramsize parameter. At command line, you simply have to add ''-ramsize ram_value'', where //ram_value// can assume one of the following values 

  8k
  16k
  32k (default)


===== Known Issues =====

The emulation of these systems is Preliminary.


===== History and Trivia =====

These computers are new versions of the PET series. The main improvement was the new ROM version (v4.0) which offered new possibilities such as direct disk operation commands (DLOAD, DSAVE, COPY, HEADER, etc.) or the ability to repeat cursor control characters by 
holding down keys. Late models also had a larger screen (12'') than the 2001 computers.

The disk drives were "Intelligent", which means that they were CPU driven (MOS 6502) and had internal RAM (4 KB) & ROM (16KB, which contained the DOS).

The 4032 and the 4016 were sold with an 80-column dot matrix printer (5x8 character matrix). This printer (4022) was an Epson printer with a Commodore name on it. 

//(info from old-computers.com)//


===== Links =====

  * [[http://www.portcommodore.com/petindex.php?path=main-cbmidx|Larry's PET/CBM Pages]]
  * [[http://www.6502.org/users/andre/petindex/index.html|PET Index]]
  * [[http://old-computers.com/museum/computer.asp?c=103|CBM 40xx at old-computers.com]]


===== Other Emulators =====

  * [[http://www.viceteam.org/|VICE]]

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