remove support for Ultrawarp card and simplify other softswitches

src/glue.decompress.a

@@ -81,8 +81,6 @@ DecompressHGR
 DecompressDHGR
          jsr   DecompressHGR
          sta   WRITEMAINMEM
-         jsr   DHGRMode              ; OpenEmulator incorrectly switches out of
-                                     ; DHGR mode during accelerated decompression
          lda   #$60
          sta   PageFrom+2
          lda   #$40

src/hw.accel.a

@@ -6,8 +6,7 @@
 ;
 ; Forked from NORMFAST Release 6 (see changelog below)
 ;
-; No functional changes to the acceleration routines, but for
-; Total Replay, we split the machine identification code from
+; For Total Replay, we split the machine identification code from
 ; the (de)acceleration code, because we can do the ID part once
 ; at program startup (when ROM is easily available), then
 ; (de)accelerate repeatedly from the language card (when ROM
@@ -135,11 +134,6 @@ tw1_speed       =    $C074
 TW1_1MHZ        =    1
 TW1_MAX         =    0
 
-; Trademarked German accelerator
-; overlaps annunciator 2 & //c mouse interrupts
-uw_fast         =    $C05C
-uw_1mhz         =    $C05D
-
 ; Zip Chip
 ; overlaps annunciator 1 & //c vertical blank
 zc_lock         =    $C05A
@@ -355,16 +349,10 @@ addon
          ; TransWarp I
          sta   tw1_speed
 
-        ; trademarked accelerator from Germany
-
-        tay
-
-         sta   uw_fast,y ; value does not matter, SMC
-                         ; no blind setting on the IIc
-                         ; it has unwanted side-effects
+         ; no UW support here because the softswitch to enable
+         ; acceleration triggers DHGR bugs in OpenEmulator :-(
 
          ; Zip Chip
-
          ldy   #FC_1MHZ
          eor   #1
          tax
@@ -372,7 +360,7 @@ addon
          ldy   #FC_ON
 +        lda   #ZC_UNLOCK
          php
-         sei             ; timing sensitive
+         sei              ; following sequence is timing sensitive
          sta   zc_lock
          sta   zc_lock
          sta   zc_lock
@@ -381,7 +369,6 @@ addon
          sta   zc_lock,x  ; disable/enable
          lda   #ZC_LOCK
          sta   zc_lock
-         sta   $C05D     ; fix colouring
 
 FASTChip
          lda   #FC_UNLOCK