Table of Contents

CBM PET 2001 (1977), CBM 30xx series (1979)

Features

Usage

MESS emulates the following computers

For each systems, MESS supports

  1. two datasettes, using “cassette1” (cass1) and “cassette2” (cass2) devices, for tapes in .tap and .wav format (currently not working)
  2. two cart slots, “cartridge1” (cart1) and “cartridge2” (cart2), for cart dumps in .crt, .a0 and .b0 format
  3. 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.

Miscellaneous

To load a directory of available files you can use 

LOAD"$"[,<devicenumber>]

i.e. to see what is on a disk (device number=8) type 

LOAD"$",8

to see what is on a tape type (default) 

LOAD"$"

To load a file into memory from an external device 

LOAD"<filename>"[,<devicenumber>]

To run the file currently in memory type 

RUN
Floppy Disks

Since the diskdrive is device number 8, you have to use 

LOAD"<filename>",8

e.g. 

LOAD"PACMAN",8
Cassettes

Since the tape drive is the default device, you can simply use 

LOAD"<filename>"

e.g. LOAD”PACMAN”

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 Esc key for EXIT). The keyboard emulation mode is toggled using the Scrl Lock key (by default).

Original Keyboard (pet2001): 73 key 'chicklet' keyboard with numeric keypad 

CLR CRSR CRSR INST
 @    !    "    #    $    %    '    &    \    (    )    <-    [    ]          HOME  U/D  L/R  DEL
 
RVS
OFF     Q    W    E    R    T     Y    U    I    O    P    UP   <    >          7    8    9    /

 SHIFT                                                      STOP
 LOCK     A    S    D    F     G     H    J    K    L   :   RUN  RETURN         4    5    6    *
 
 																				
  SHIFT     Z    X    C    V    B     N    M     ,    ;   ?    SHIFT            1    2    3    +
 
 
                                SPACEBAR                                        0    .    -    =

Original Keyboard (pet2001n, pet2001b, cbm30xx): QWERTY full-stroke keyboard, and sometimes calculator type 

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 most of 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 

4k
8k
8k
16k
32k (default)

Known Issues

History and Trivia

The name PET, besides being a marketing ploy to imply a user-friendly machine, is an acronym for “Personal Electronic Translator”.

The Commodore PET 2001 was a great success. Three models were made : the PET 2001-8N with 8 KB RAM, PET 2001-16N with 16 KB RAM and the PET 2001-32N. They were conceived by Chuck Peddle who later founded Tandon, a drive manufacturer.

The CBM 3xxx and 4xxx series were revisions of the original PET 2001. The range was rebranded CBM (Commodore Business Machine), as PET was dropped.

The 3xxx series introduced the 3000 series ROM sets, BASIC v3, and a completely redesigned keyboard layout, which used a full typewriter keyboard instead of the “mickey mouse” keyboard of the PET, and dropped the on-board cassette unit.

(info from old-computers.com)

Links

Other Emulators