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- Path: sparky!uunet!cis.ohio-state.edu!ucbvax!LL.MIT.EDU!sage
- From: sage@LL.MIT.EDU (Jay Sage)
- Newsgroups: comp.os.cpm
- Subject: Miscellaneous Replies
- Message-ID: <9207201042.AA09020@LL.MIT.EDU>
- Date: 20 Jul 92 14:42:24 GMT
- Sender: usenet@ucbvax.BERKELEY.EDU
- Organization: The Internet
- Lines: 47
-
-
- To "williams9027@iscsvax.uni.edu" about "converting files": There are
- very nice programs that run on a PC that will read hundreds of CP/M disk
- formats. One of the nicest ones is 22DISK, shareware from Sydex in Oregon
- and available on just about all MS-DOS BBS systems. Whether it will do the
- trick depends on what CP/M disk format you are dealing with.
-
- This technique will copy the data in the files over to the DOS machine as
- binary data, i.e., completely unchanged. What you do with the data then is
- a separate problem. ASCII text is never a problem. If they are WordStar
- files, for example, they can be used with DOS versions of WordStar. The
- same goes for dBaseII files. Lots of other programs have the ability to
- convert data that is in those popular formats. If the data is for some
- strange program, then you will have more trouble and might have to write
- your own conversion software.
-
- If you want to move to a Mac, I'd suggest converting to DOS first. There
- are programs available for the Mac that allow it to read DOS diskettes.
-
- Matthew Kasdorf was looking for a boot disk for the iBEX 7102. Don
- Maslin of the Dino(saur)SIG in San Diego probably has this boot disk in his
- collection. If not, I have a friend who HAD an iBEX. It may have been the
- 7102, and he may still have it. If Don does not have the disk, let me know
- and I will try to track it down.
-
- On the subject of undocumented Z80 opcodes, Dag Erik Lindberg recently
- wrote, "Zilog recognized that some useful things could be done with those
- op-codes, but flat stated that if their manufacturing process changed, or
- micro-code was modified, those op-codes may not work any more. As it turned
- out, the Z80 sort of dead-ended development wise, and that never happened."
-
- Not at all! The Z80 was far from dead-ended. The Z180 and Z280 chips
- have followed it. Both are Z80-code-compatible. They are supposed to run
- everything written properly for the Z80. Thus, they are not guaranteed to
- run programs that used the undocumented codes (and I don't know if the Z180
- or Z280 run those codes or not).
-
- I once built a computer (actually, it is still running my home electrical
- and heating systems) using an Intel 8085, and I made use of its undocumented
- opcodes. Later I had to replace the chip with one from Toshiba, and I had a
- sudden sinking feeling that the software would no longer run because I had
- used those opcodes. But it ran fine. Either Toshiba had licensed the mask
- designs or the operation of those codes followed automatically from the
- obvious implemention of the documented codes.
-
- -- Jay Sage
-
-