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-
- AME86
-
- Application Migration Executive
- CP/M-86 emulator for MSDOS
-
- Jean-Marc Lugrin, Digital Equipment Corporation
-
- This emulator allows you to run CP/M-86 programs under MSDOS.
- The goal is to ease transfer of already developed applications,
- and to allow co-existence of CP/M-86 and MSDOS applications. The
- goal is to emulate CP/M-86 as commonly used on the Rainbow-100
- computer.
-
- Programs which depend too heavily on the internal structure of
- CP/M-86 are not likely to work correctly. This includes
- communication programs (poly-XXX, Kermit), debuggers (DDT86),
- device maintenance programs (STAT, MAINT, FORMAT). The same class
- of program that is easy to transfer to CCPM should run on AME86.
- For other limitations see below. It is possible to develop and
- test CP/M-86 programs (using ASM86, GENCMD or MWC or other CP/M-86
- compilers) under MSDOS+AME86.
-
- NOTE: A CP/M-86 license is necessary to use Digital Research
- products with AME86.
-
- To run a CP/M-86 program use the command:
-
- AME86 [ path ] CP/M-86-program/[C,S|F,I] [ arguments ]
-
- AME86 will be searched for using the current PATH environment
- variable, but the CP/M-86 program must reside in the current
- directory or in a directory specified on the command line.
- Options must directly follow the name of the program to be loaded
- (NO space allowed). If SWITCHAR is "-", then replace "-" for "/"
- in the examples. The following options are recognized:
-
- /C - control-C will NOT abort your program. Under MSDOS control-C
- may abort your program at any console i/o operation (except
- some direct console i/o), or even at any system request (disk
- i/o or other request) if the option BREAK=ON has been used in
- CONFIG.SYS. This feature is useful for stopping erroneous
- programs, but may conflict with the way control-C is handled
- by the emulated program. If you do NOT want control-C
- trapping by MSDOS during execution of the program, use option
- /C. This should only be used with program known to work
- well, and to work with AME86 (e.g. RED).
-
- NOTE: If a program had any file open for writing when
- control-C was issued, the disk may be corrupted. You should
- run CHKDSK to check disk structure.
-
- /S and /F:
- Both options are for similar uses, and are mutually
- exclusive. Under CP/M-86 (and MSDOS) a program cannot know
- from where it was loaded (which drive). Under AME86 it
- cannot even know from which directory. This is a problem
- with program using HELP files or OVERLAYS (like RED, TURBO,
- WS, etc), as they do not know where to look for them.
- Normally they look at the default drive established at load,
- or at the boot drive. AME86 returns the drive used to load
- the program as the boot drive. Still the program may look in
- the wrong drive or the wrong directory. To allow a program a
- way to find overlays or help files, AME86 can give them a
- second chance on OPEN or CHAIN (but NOT on MAKE, SEARCH_FIRST
- or SEARCH_NEXT). The second chance is given ONLY if the file
- is assumed to be in the drive which was the CURRENT DRIVE
- when the program was loaded or if a PATH was specified on the
- command line, and if option /S or /F was specified. AME86
- uses a heuristic to avoid trying to open using the same file
- name twice. Inpact on speed is minimal for option /S with
- floppy drive, with option /F with MDRIVE.
-
- NOTE: On 0.7-1 a bug precludes the use of /S and /F together
- with a path name.
-
- /S - Search: Allows for a second chance AFTER the file was looked
- in the current directory of the specified drive.
-
- Possible problem: if the user opens a data file which does
- not exist on the specified drive, and one exists on the load
- drive, the one on the load drive will be used without
- warning.
-
- /F - First Search: FIRST tries to open on the load device and
- pathname if the drive qualifies (is either the default drive
- at load or the effective load drive and a pathname is
- specified).
-
- Possible problem: if the user tries to open a data file on a
- specific disk, and a file with the same name exists on the
- load drive, the file on the load drive will be used without
- warning.
-
- /I - Ignore: This option gives a better (but less secure)
- emulation of CP/M-86. The following functionality is
- modified:
-
- 1) If the program calls CP/M-86 for an illegal request, AME86
- returns with AX=BX=0.
-
- 2) If the program asks for a SEARCH in special mode, AME86
- will attempt to emulate it (for STAT and MAINT). This does
- not run very well now...
-
- This option should be used carefully.
-
- NOTE: If you use BREAK=ON in your CONFIG.SYS, MSDOS will check
- for ^C at any system call. Your program has no possibility to
- intercept this Control/C: it is aborted. If you use BREAK=ON,
- and your program normally handle ^C itself, you have to be
- carrefull to type ^C ONLY when your program ask for some input.
- These is not always convenient, you may desire to supress BREAK=ON
- or use option /C.
-
- Copyright:
- Jean-Marc Lugrin, Digital Equipment Corporation, 1983, 1984