Model 100 System Map Part 1 (0000-0CD9)
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| Model 100 System Map |
------------------------
ROM: Part I
Copyright 1985
Revision Date: 09/30/85
Compiled and Researched by:
Robert D. Covington
Systems Information Management Consultants
[Not associated with The Covington Group, N. Y., N. Y.]
This document may be duplicated and distributed free of
charge to any individuals who desire it. Any duplications of
this document, however, must inluce all of the information
contained here-in, with no deletions or changes.
The author and distributors of this document make no
expressed or implied warrantees as to the validity of the
information contained here in.
- Model 100 ROM Memory Map -
0000H - System Reset
0008H - Compare character following RST 8H with the character pointed
to by HL.
Entry:
HL - Points to the buffer to be used for the
comparison. The character after call is compared
with the character pointed to by HL.
Exit:
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.
Entry:
HL - Points to buffer
Exit:
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
Entry:
HL - Number to compare
DE - Number to compare
Exit:
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.
Entry:
F675H - Device to output space to (0-screen, 1-printer)
Exit:
A - 20H
0020H - Print character in A on the screen or printer depending on
the output flag F675H.
Entry:
A - Character to print
F675H - Device to output character to (0-screen,
1-printer)
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.
Exit:
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
Exit:
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
interrupt.
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
Entry:
E - Contains error number
048DH - Restore old stack and runtime pointers and jump to the
address in BC.
Entry:
BC - Address to jump to following the call
Exit:
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.
Entry:
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
edited.
Exit:
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
program.
Entry:
DE - Line number to find
Exit:
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.
Entry:
HL - Location to start line number search
DE - Line number to find
Exit:
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.
Entry:
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.
Entry:
HL - Points to location where program exectution is to
begin.
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.
Entry:
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.
Entry:
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 "."
Entry:
HL - Points to buffer where line number describer is.
The buffer is terminated by any non-number other
than a ".".
Exit:
Same as 08EBH
08EBH - Convert the ASCII number pointed to by HL to binary. Number
must be less than 65529 and be an integer.
Entry:
HL - Points to the ASCII number buffer. The buffer is
terminated by any non-number.
Exit:
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.
Entry:
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
