Apple-2-SW/prodos-drivers
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ZIP: Change 1-4 to slow 5-7 to fast

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This commit is contained in:
Joshua Bell 2024-04-21 19:56:39 -07:00
parent 1ed40ff2dc
commit 92405b500e
2 changed files with 4 additions and 5 deletions
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2
README.md
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@ -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)

7
accelerators/zipchip/zipchip.system.s
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@ -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