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CPM OPERATING SYSTEMS/CPM 2.X/CPM 2.2/PATCHES/RMAC.MOD

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+El Paso, TX, 10/18/83
+
+When I wrote LDIR a few hours ago, I realized that RMAC was unable to
+handle the job, since it would wipe out DOLLAR-SIGNS in labels.  Some
+SYSLIB routines, however, use them in external references...
+
+	EXTRN	F$OPEN		in RMAC is synonymous to
+	EXTRN	FOPEN
+
+and LINK would complain about the missing symbol FOPEN!
+
+Now, there just HADT TO BE a better way than M80, and after a lot of
+DU'ing and DDT'ing, I found it! In RMAC ver 1.1 you find the following
+code starting at address 1D76:
+
+L1D76:	CPI	'$'
+	RNZ
+	XRA	A
+	MOV	M,A
+	RET
+
+Now, to be able to use RMAC instead of M80 for *ALL* your SYSLIB work,
+make a NOP out of the MOV M,A instruction! Remember, the address is only
+good for my version of RMAC, as supplied with an early version of CP/M plus.
+Your RMAC may be a bit different, but the code should be in the general
+area.
+
+With the availability of CP/M plus, more people will probably use RMAC
+than M80, and this easy patch (which seems to have NO ILL EFFECTS) allows
+use of SYSLIB with RMAC.
+
+My recommendation: reformat SYSLIB into an IRL file for faster searching.