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fix MOS format for testing using ugly hack. Bumped to 3.03.06mosfix1 #9

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fix MOS format for testing using ugly hack. Bumped to 3.03.06mosfix1 #9

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4 changes: 3 additions & 1 deletion sbapack/dec.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@
# Default values
# ------------------------------------------------------------------------------

VERSION = "3.03.06"
VERSION = "3.03.06mosfix1"
DEF_ENV = "SBASM"
ERRLVL_OK = 0 # No errors
ERRLVL_PASS1 = 1 # Errors found during pass 1
Expand All @@ -37,6 +37,7 @@
COMMENT1 = ";*#@" # Legal comment delimiters on beginning of the line
COMMENT2 = ";" # Legal comment delimiters anywhere else on the line
EOL = '\n' # System dependant end of line character
XOFF = '\x13' # XOFF char 0x13 = dec(19) = ctrl+S
MAX8 = (1 << 8)-1 # Max value for 8 bit numbers
MAX16 = (1 << 16)-1 # Max value for 16 bit numbers
MAX32 = (1 << 32)-1 # Max value for 32 bit numbers
Expand Down Expand Up @@ -96,6 +97,7 @@ class Struct: # General data structure class
Asm.Code_Tfile = None # File handle for code target file
Asm.Code_Tbuffer = [] # Line buffer for code target file
Asm.Code_Tformat = '' # Code file's format
Asm.Code_TformatMOS_records = 0 # static record/line counter for TformatMOS()
Asm.Code_Tfunc = None # Indirect function handler
Asm.Code_Tlength = 0 # Wanted target record length
Asm.Code_Twrap = False # Set if wrap warning already given
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21 changes: 20 additions & 1 deletion sbapack/target.py
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Original file line number Diff line number Diff line change
Expand Up @@ -421,9 +421,13 @@ def TformatMOS(buffer, memory, last=False):

"""
Format a MOS technology target file.
Implement MOS format from here:
https://archive.org/details/KIM-1_Users_Manual/page/n98/mode/1up
https://srecord.sourceforge.net/man/man5/srec_mos_tech.5.html
"""

if len(buffer) > 0:
dec.Asm.Code_TformatMOS_records += 1 # count record/line
address = buffer[0]
length = len(buffer) - 1
checksum = length + ((address >> 8) & 0xFF) + (address & 0xFF)
Expand All @@ -444,7 +448,22 @@ def TformatMOS(buffer, memory, last=False):
line = ''

if last:
line = line + ';00' + dec.EOL
# Checked KIM-ROM how last line is processed
# after ';' it read the length and the address (as usual including calc the checksum)
# For lastline length=0 then only the checksum of address counts
# no more data read because of length=0
# next 2 byte are read and compared against the checksum (as usual nothing special except length=0 does not count)
# !!! for the first 255 lines address and checksum have the same value
# example: ";0000090009" or ";000230023" but ";0001230024"
# checksum == bad => print from offset 0x11 to TOP "\r ERR\r KIM\r\n" + 6 zero bytes
# checksum == good => print from offset 0x0c to TOP "\r KIM\r\n" + 6 zero bytes
# It will not expect or read further data like XOFF or EOL
# after print it will directly "JMP START" for further processing
# The XOFF and EOL are added to not confuse editor
line = line + ';00' # length = 0
address = dec.Asm.Code_TformatMOS_records
checksum = ((address >> 8) & 0xFF) + (address & 0xFF) # length = 0
line = line + ToHex(address, 2) + ToHex(checksum, 2) + dec.XOFF + dec.EOL

return line.upper()

Expand Down