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55 lines
2.0 KiB
Plaintext
55 lines
2.0 KiB
Plaintext
; C02 Module filesys Assembly Language Eoutines for run6502 emulator
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; This is the reference implementation of the filesys module
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; Requires external functions FSCMD and FSDRVN (fileio.h02)
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SUBROUTINE FILESYS
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;remove(drv, &filnam) - Remove File filnam
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;Args: A = Drive Identifier
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; Y,X = Address of Directory Name String
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;Returns: A = Error Code (0 = None)
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REMOVE: JSR FSDRVN ;Validate Drive Number
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BCS .RETURN ;If Invalid Return Error
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LDA #'K' ;Set Command to KILL (REMOVE)
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.FSCMDX JSR FSCMD ;Execute Command
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TXA ;Return Result
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RTS
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;rename(drv, &filnam) - Rename File to filnam
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;Setup: Call FSNAME with Address of Old Name
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;Args: A = Drive Identifier
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; Y,X = Address of Directory Name String
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;Returns: A = Error Code (0 = None)
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RENAME: JSR FSDRVN ;Convert Drive Letter to Drive Number
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BCS .RETURN ;If Invalid Return Error
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LDA #'M' ;Set Command to KILL (REMOVE)
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BNE .FSCMDX ;Execute Command and Return Result
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;inidrv(drv) - Initialize Disk Drive
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;Args: A = Drive Identifier
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;Returns: A = Error Code (0 = None)
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INIDRV: LDA #$FF ;Return Error - Not Implemented
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RTS
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;chdrv() - Set Current Drive/Disk
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;Args: A = Drive# | Disk#
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;Returns: A = Result (0 - Success)
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; Y = Error Code (0 = None)
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CHDRV: JSR FSDRVN ;Validate Drive Number
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BCS .RETURN ;If Invalid Return Error
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TAY ;Set Drive Number
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SEC ;Set Mode to Change
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LDA #'V' ;Set Command to DRIVE
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BNE .FSCMDX ;Execute Command and Return Result
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;getdrv() - Get Current Drive/Disk
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;Returns: A = Drive# | Disk# (0=Failure)
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; Y = Error Code (0 = None)
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GETDRV: CLC ;Set Mode to Get
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LDA #'V' ;Set Command to DRIVE
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JSR FSCMD ;Execute Command
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TXA ;Copy Drive Number to A
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ADC #'@' ; Convert to Drive Letter
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.RETURN RTS
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