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72 lines
2.8 KiB
Python
72 lines
2.8 KiB
Python
#Oric .TAP Converter
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#Builds Oric/Atmos .TAP file from DASM -F1 file
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#DASM -F1 File two byte load address in LSB, MSB order
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#followed by binary object coda
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#Oric/Atmos .TAP file has the following structure:
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# $16 $16 $16 $16 Tape Synchronization Bytes
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# $24 $00 $00 Header Start Bytes
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# $00/$80 Program Type (BASIC/Assembly)
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# $00/$80/$C7 Autostart (None/BASIC/Assembly)
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# $XX $XX End Address (MSB, LSB)
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# $XX $XX Start Address (MSB, LSB)
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# $00 Padding Byte
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# 'XXX...' File Name (up to 16 characters)
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# $00 File Name Terminator
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# ... Program Data
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import os
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import sys
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def getArgs():
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argCount = len(sys.argv)
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if argCount != 2:
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print("Usage:", sys.argv[0], "objfile")
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exit(2)
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return sys.argv[1]
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def splitFileSpec(filePath):
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fileDir, fileSpec = os.path.split(filePath)
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fileName, fileExt = os.path.splitext(fileSpec)
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if fileExt == '': fileExt = '.obj'
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return fileDir, fileName, fileExt
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def readPrgFile(fileSpec):
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with open(fileSpec, "rb") as prgFile:
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prgAddr = prgFile.read(2)
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prgData = prgFile.read()
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address = prgAddr[0] + prgAddr[1] * 256
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return address, prgData
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def writeTapFile(dir, name, addr, data):
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tapName = os.path.join(dir, name + ".tap")
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size = len(data)+1 #Program Size includes trailing 0 byte
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type = b'\x00' if addr == 0x0501 else b'\x80' #Program Type BASIC/Assembly
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auto = b'\x00' #Autostart (None)
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#auto = b'\x80' if type == b'\x00' else b'\xC7' #Autostart Flag
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start = addr.to_bytes(2, byteorder='big') #Program Start Address
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end = (addr+size).to_bytes(2, byteorder='big') #Program End Address
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ascName = name.upper().encode('ASCII') #Program Name as ASCII bytes object
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with open(tapName, "wb") as tapFile:
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tapFile.write(b'\x16\x16\x16\x16') #Tape Synchronization Bytes
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tapFile.write(b'\x24\x00\x00') #Header Start Byte
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tapFile.write(type) #Program Type
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tapFile.write(auto) #Autostart Flag
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tapFile.write(end) #Program End Address
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tapFile.write(start) #Program Start Address MSB
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tapFile.write(b'\x00') #Padding Byte
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tapFile.write(ascName) #File Name
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tapFile.write(b'\x00') #String Terminator
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tapFile.write(data) #Binary Program Code
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tapFile.write(b'\x00') #Final Dummy Byte
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return tapName
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objFile = getArgs()
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fileDir, fileName, fileExt = splitFileSpec(objFile)
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inName = os.path.join(fileDir, fileName + fileExt)
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print("Reading file", inName)
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inAddr, inData = readPrgFile(inName)
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outName = writeTapFile(fileDir, fileName, inAddr, inData)
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print ("Wrote file", outName)
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