Fix some low memory conditions

src/scripts/hrplot.4th

@@ -1,6 +1,11 @@
 LOOKUP HRFORTH  ( HGR page 1 reserved )
 NOT ?ABORT" Must run with HRFORTH."
 
+SRC" MACHID.4TH"
+MACHID MACHID.MEM AND MACHID.128K
+<> ?ABORT" 128K required."
+FORGET MACHID
+
 SRC" PLASMA.4TH"
 SRC" CONIO.4TH"
 SRC" HGRLIB.4TH"

src/scripts/machid.4th

@@ -1,4 +1,5 @@
 ' MACHID ?ENDSRC
+LOOKUP MACHID C@ CONSTANT MACHID
 $01 CONSTANT MACHID.CLOCK
 $02 CONSTANT MACHID.80COL
 $30 CONSTANT MACHID.MEM
@@ -11,4 +12,3 @@ $80 CONSTANT MACHID.IIE
 $C0 CONSTANT MACHID.III
 $88 CONSTANT MACHID.IIC
 $08 CONSTANT MACHID.I
-LOOKUP MACHID C@ CONSTANT MACHID