Model 100 System Map Part 1 (0000-0CD9)

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This is a derived work of the "Model 100 System Map", Copyright (C) 1985, Robert D. Covington, Systems Information Management Consultants.

                      - Model 100 ROM Memory Map -

0000H -  System Reset

0008H -  Compare character following RST 8H with the character pointed 
         to by HL.
               HL - Points to the buffer to be used for the 
                    comparison.  The character after call is compared 
                    with the character pointed to by HL.
               If compare is successful a RST 10H is issued
               If compare is unsuccessful, a SYNTAX ERROR is generated

0010H -  Get the next character in the buffer pointed to by HL and 
         place it in the A register.  HL is incremented prior to the 
         load.  Spaces and tabs in the buffer are skipped.
               HL - Points to buffer
               A  - Character loaded from buffer
               HL - Incremented
           C flag - Set if character is a digit
           Z flag - Set if character is a colon or null

0018H -  Compare DE and HL
               HL - Number to compare
               DE - Number to compare
           C flag - Set if HL<DE
           Z flag - Set if HL=DE
                A - Destroyed

001EH -  Send a space to the screen or printer depending on the output 
         flag at F675H.
            F675H - Device to output space to (0-screen, 1-printer)
                A - 20H

0020H -  Print character in A on the screen or printer depending on 
         the output flag F675H.
                A - Character to print
            F675H - Device to output character to (0-screen, 

0024H -  8085 TRAP interrupt vector.  This non maskable interrupt is 
         generated if the CPU does not have enough power to operate.  
         When the interrupt occurs, the CPU jumps to F602H.

0028H -  Determine the type of the last variable used.
                A - Destroyed
           Z flag - Set if string
           C flag - Reset if double precision
           S flag - Set (M) if integer
           P flag - Odd if single precision

002CH -  8085 RST 5.5 interrupt vector.  This interrrupt is generated 
         by the data being present on the Bar Code Reader port.  This 
         interrupt jumps to F5F9H.

0030H -  Returns sign of FAC1
                A - Destroyed

0034H -  8085 RST 6.5 interrupt vector.  This interrupt is generated 
         if a character is pending on the RS232 UART.  The RAM vector 
         F5FCH is called on each interrupt.

0038H -  RAM vector table driver.  The byte after the call determines 
         the offset index for the highmem vector table starting at 
         FADAH.  This routine calls the contents of the address 
         computed by adding the offset to FADAH.

003CH -  8085 RST 7.5 interrupt vector.  This interrupt is generated 
         by the internal timer normally at regular 4 microsecond 
         intervals (255 times per second).  On each interrupt, the 
         Model 100 performs a keyboard scan and updates the typeahead 
         buffer if nescessary.  The RAM vector F5FFH is called on each 

0040H -  Start of function vector table for SGN to MID$

007FH -  End of function vector table

0080H -  Start of BASIC statement keyword table END to NEW

018EH -  End of BASIC statement keyword table

018FH -  Start of function keywords TAB to <

01EFH -  End of function keywords TAB to <

01F0H -  Start of function keywords SGN to MID$

025FH -  End of function keywords SGN to MID$

0262H -  Start of BASIC statement vector table for END to NEW

02E1H -  End of BASIC statement vector table

02EEH -  Start of vector for math operations (used at 10DAH)

031BH -  End of math vector table

031CH -  Start of BASIC 2 character error message text

0359H -  End of error message text

035AH -  Initialization image loaded at F5F0H-F76FH on cold boot

036FH -  Code loaded at F605H on boot to detect external ROM

03E9H -  End of initialization image

0401H -  Pop the return address for a NEXT or RETURN off the stack.

0422H -  Initialize system and go to BASIC ready

0446H -  Generate Syntax error

0449H -  Generate /0 error

044CH -  Generate NF error

044FH -  Generate DD error

0452H -  Generate RW error

0455H -  Generate OV error

0458H -  Generate MO error

045BH -  Generate TM error

045DH -  Generate error number E
                E - Contains error number

048DH -  Restore old stack and runtime pointers and jump to the 
         address in BC.
               BC - Address to jump to following the call
               HL - Contains the contents of FB99H

0501H -  Vector to BASIC Ready (Ok).  Pops the last address off the 
         stack to maintain stack integrity.

0502H -  Vector to BASIC Ready (Ok). Jump.

0511H -  Vector to BASIC ready that does not reinitialize the system 
         or print Ok.  This is primarily used inside the BASIC ready 
         routine if a blank or illegal line was entered and control 
         must return back to BASIC ready.

0523H -  Perform operation in (HL) buffer and return to BASIC ready.
               HL - Points to the BASIC command line terminated with 
                    a carriage return (0DH)

05F0H -  Update in memory line addresses for the current BASIC program 
         lines.  Address calculations start with the start of BASIC 
         pointer.  This routine is primarily used if a program has 
         been loaded off tape or if the current program has been 
            HL, DE, and AF are destroyed

0626H -  Put the contents of HL on the stack (to save it) and find the 
         line number in DE via 0628H.  On return from this routine, 
         you must POP HL off the stack to return it to its original 
         value and to preserve stack balance.

0628H -  Find line # DE starting at the beginning of the current BASIC 
               DE - Line number to find
               BC - Address of line
               HL - Address of next line
           C flag - Set if line found
           Z flag - Set if line not found

062BH -  Find the line number in DE via 0628H but start at the address 
         in HL instead at the start of the BASIC program.
               HL - Location to start line number search
               DE - Line number to find
               See 0628H

0646H -  Token compression routine

0726H -  FOR Statement

076BH -  TO Statement

0783H -  STEP Statement

0804H -  BASIC program execution routine.  This routine evaluates the 
         compressed BASIC code and executes the appropriate 
         instructions.  Upon return from most instructions, this 
         address is placed on the top of the stack.  Routines which 
         wish to continue program execution should vector here if the 
         stack becomes unbalanced.
               HL - Points to compressed BASIC code to execute

083AH -  Start executing a program at the address in HL.  This routine 
         starts the 0804H program executer routine.
               HL - Points to location where program exectution is to 

0840H -  Execute the compressed instruction token in the A register. 
         Any parameters for the instruction must be in the buffer 
         pointed to by HL.  If the contents of the A register are less 
         than 128 then a LET is executed.
                A - Compressed BASIC token for the instruction that 
                    is to be executed.
               HL - Points to the buffer which contains the 
                    parameters to the BASIC statement.

0858H -  RST 10H routine (see 10H).

0859H -  Same as RST 10H but with no pre-increment of HL (see 10H).

0872H -  DEF Statement

0881H -  DEFDBL statement

0886H -  DEFINT statement

0896H -  DEFSNG statement

089FH -  DEFSTR statement

08A1H -  Declare the variables in the buffer pointed to by HL to the 
         type in the E register.  The variables in the buffer pointed 
         to by HL must be in the same form as those used for a 
         DEF(type) statement in BASIC.
                E - Type of variable (2-integer, 3-string, 4-single 
                    precision, 8-double precision)
               HL - Points to buffer containing variables to declare.

08DBH -  Generate FC Error

08E0H -  Evaluate line number text pointed to by HL.  This routine 
         will evaluate an ASCII line number or a "."
               HL - Points to buffer where line number describer is.  
                    The buffer is terminated by any non-number other 
                    than a ".".
               Same as 08EBH

08EBH -  Convert the ASCII number pointed to by HL to binary.  Number 
         must be less than 65529 and be an integer.
               HL - Points to the ASCII number buffer.  The buffer is 
                    terminated by any non-number.
               DE - Contains the binary equivalent of buffer
                A - Destroyed
           C flag - Set if a number was present

08ECH -  Same as 08EBH except that conversion starts at HL+1

090FH -  RUN Statement

091EH -  GOSUB Statement

0936H -  GOTO Statement

094DH -  Generate UL error

0966H -  RETURN Statement

099EH -  DATA Statement

09A0H -  REM Statement

09C3H -  LET Statement.  Perform the variable assignment in the buffer 
         pointed to by HL.
               HL - Points to the variable assignment to evaluate.

0A2FH -  ON Statement

0A34H -  ON ERROR Statement

0AB0H -  RESUME Statement

0B0FH -  ERROR Statement

0B1AH -  IF Statement

0B4EH -  LPRINT Statement

0B56H -  PRINT Statement

0C01H -  TAB Statement

0C45H -  LINE Statement

0C99H -  INPUT # Statement

0CA3H -  INPUT Statement

0CD9H -  READ Statement