ZIP: Change 1-4 to slow 5-7 to fast

a2stuff · Apr 22, 2024 · 92405b5 · 92405b5
1 parent 1ed40ff
commit 92405b5
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Showing 2 changed files with 4 additions and 5 deletions.
diff --git a/README.md b/README.md
@@ -33,7 +33,7 @@ This repo includes the following drivers/modifications:
   * FujiNet Clock
   * A "jumbo" driver that includes all of the above (just called `CLOCK.SYSTEM`)
 * Accelerators
-  * ZIP CHIP configuration (sets the chip to slow on speaker access)
+  * ZIP CHIP configuration (slow on speaker access, make slots 1-4 fast)
 * RAM Disk drivers
   * RAMWorks Driver by Glen E. Bredon
 * Quit dispatcher/selector (`BYE` routines)

diff --git a/accelerators/zipchip/zipchip.system.s b/accelerators/zipchip/zipchip.system.s
@@ -1,5 +1,5 @@
 ;;; ZIPCHIP.SYSTEM
-;;; Configures the speaker to be temporarily slow
+;;; Configures the speaker to be temporarily slow, slots 1-4 fast
 ;;; TODO: Add a configuration utility
 
         .setcpu "6502"
@@ -127,9 +127,8 @@
         cmp     ZC_REG_SLOTSPKR
         bne     no_zip
 
-        ;; Slow on speaker access
-        lda     ZC_REG_SLOTSPKR
-        ora     #%00000001      ; bit 0 = Speaker
+        ;; Slow on speaker access, slots 1-4 fast, 5-7 normal
+        lda     #%11100001      ; bit 0 = Speaker, bit N = slot N
         sta     ZC_REG_SLOTSPKR
 
         ;; Get size