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From 244dc358e55a9b86a7281d40a576355c21268f30 Mon Sep 17 00:00:00 2001
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From: mc78 <mc78@outlook.de>
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Date: Sun, 1 Dec 2019 13:25:14 +0100
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Subject: [PATCH 137/170] Changed the order in which lo/hi bytes of vdc addr
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are set according to willimanilys ((z64k) suggestions. Changed offset for vdc
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ramsize detection from 000 to 000.
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---
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libsrc/c128/emd/c128-vdc.s | 22 ++++++++++++----------
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1 file changed, 12 insertions(+), 10 deletions(-)
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diff --git a/libsrc/c128/emd/c128-vdc.s b/libsrc/c128/emd/c128-vdc.s
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index 842059c3..e359dcdb 100644
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--- a/libsrc/c128/emd/c128-vdc.s
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+++ b/libsrc/c128/emd/c128-vdc.s
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@@ -104,7 +104,7 @@ INSTALL:
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lda ptr2
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cmp ptr2+1
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bne @have64k
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-
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+
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lda #64 ; assumes x = 0, here -> p.c = 64
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bne @setpagecnt
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@have64k:
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@@ -113,22 +113,25 @@ INSTALL:
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@setpagecnt:
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sta pagecount
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stx pagecount+1
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+
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+ txa
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+ bne @keep64kBit
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ldx #VDC_CSET ; restore 16/64k flag
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lda vdc_cset_save
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- jsr vdcputreg
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-
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+ jsr vdcputreg
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+@keep64kBit:
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lda #
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ldx #>EM_ERR_OK
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rts
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test64k:
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- sta tmp3
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+ sta tmp1
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sty ptr3
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lda #0
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sta ptr3+1
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jsr settestadr1
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- lda tmp3
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+ lda tmp1
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jsr vdcputbyte ; write $55
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jsr settestadr1
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jsr vdcgetbyte ; read here
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@@ -146,7 +149,7 @@ settestadr1:
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ldy #$02 ; test page 2 (here)
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.byte $2c
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settestadr2:
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- ldy #$42 ; or page 64+2 (there)
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+ ldy #$82 ; or page 64+2 (there)
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lda #0
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jmp vdcsetsrcaddr
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@@ -334,17 +337,16 @@ COPYTO:
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;
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vdcsetsrcaddr:
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- ldx #VDC_DATA_LO
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+ ldx #VDC_DATA_HI
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stx VDC_ADDR_REG
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@L0: bit VDC_ADDR_REG
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bpl @L0
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sta VDC_DATA_REG
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- dex
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- tya
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+ inx
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stx VDC_ADDR_REG
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@L1: bit VDC_ADDR_REG ; XXX: Test waiting for register 18
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bpl @L1
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- sta VDC_DATA_REG
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+ sty VDC_DATA_REG
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rts
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vdcgetbyte:
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--
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2.26.0
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