started JiffyDOS byte reception, fixes for turbo dispatcher

c64/aliases/,aliases_config.s

@@ -304,18 +304,20 @@
 	.var features_str = ""
 
 #if CONFIG_TAPE_NORMAL
-	.eval features_str = ADD_FEATURE(features_str, "TAPE NORMAL")
+	.eval features_str = ADD_FEATURE(features_str, "TAPE LOAD NORMAL")
 #elif CONFIG_TAPE_TURBO
-	.eval features_str = ADD_FEATURE(features_str, "TAPE TURBO")
+	.eval features_str = ADD_FEATURE(features_str, "TAPE LOAD TURBO")
 #elif CONFIG_TAPE_NORMAL && CONFIG_TAPE_TURBO
-	.eval features_str = ADD_FEATURE(features_str, "TAPE NORMAL+TURBO")
+	.eval features_str = ADD_FEATURE(features_str, "TAPE LOAD NORMAL+TURBO")
 #endif
 
+	.eval feature_new_line = true
+
 #if CONFIG_IEC
 #if !CONFIG_IEC_JIFFYDOS
 	.eval features_str = ADD_FEATURE(features_str, "IEC")
 #else
-	.eval features_str = ADD_FEATURE(features_str, "IEC+JD")
+	.eval features_str = ADD_FEATURE(features_str, "IEC+JIFFY DEF")
 #endif
 #endif
 

c64/kernal/iec/f000.iec_jiffydos.s

@@ -17,7 +17,17 @@
 
 iec_tx_byte_jiffydos:
 
-	// We need to preserve 3 lowest bits of CIA2_PRA - as they encode
+	// Timing is critical, do not allow interrupts
+	sei
+
+	// Preserve .X (.Y is not used by the routine)
+	phx_trash_a
+
+	// If EOI requested (carryy flag set), mark this in IECPROTO as 0
+	bcc !+
+	dec IECPROTO                       // turns 1 into 0
+!:
+	// We need to preserve 3 lowest bits of CIA2_PRA, they contain important (but unrelated) data
 	// Use C3PO for this, as afterwards we have to set there 0 nevertheless
 	lda CIA2_PRA
 	and #%00000111
@@ -68,21 +78,40 @@ __jd_check1:
 	and #%00110000                     // clear everything but CLK/DATA
 	sta CIA2_PRA
 
+	// Signal EOI if needed     XXX calculate cycles for quicklyy pulling CLK
+	lda C3PO
+	ldx IECPROTO
+	beq iec_tx_byte_jiffydos_wait_eoi
 
+	// FALLTROUGH
 
-	// XXX EOI signalled by early CLK (20us delay for non-CLK?)
+iec_tx_byte_jiffydos_finalize:
 
+	ora #BIT_CIA2_PRA_CLK_OUT          // pull CLK
+	sta CIA2_PRA
 
 	// Re-enable sprites
 	pla
-	lda VIC_SPENA
+	sta VIC_SPENA
 
-	// Mark TX buffer as empty
+	// Mark TX buffer as empty, restore proper IECPROTO value
-	lda #$00
+	ldx #$00
-	sta C3PO
+	stx C3PO
+	inx
+	sta IECPROTO
 
+	// Restore .X, interrupts, return
+	plx_trash_a
+	cli
 	rts
 
+iec_tx_byte_jiffydos_wait_eoi:
+
+	jsr iec_wait20us // XXX is it enough?
+	lda C3PO
+	jmp iec_tx_byte_jiffydos_finalize
+
+
 
 iec_rx_byte_jiffydos:
 
@@ -105,13 +134,35 @@ iec_rx_byte_jiffydos:
 	pla
 	sta CIA2_PRA
 
+	// Retrieve byte XXX count cycles, synchronize
+	lda CIA2_PRA                       // bits 0 and 1
+	and #%11000000
+	pha
 
-	// XXX retrieve byte
+	lda CIA2_PRA                       // bits 2 and 3
+	and #%11000000
+	pha
+
+	lda CIA2_PRA                       // bits 4 and 5
+	and #%11000000
+	pha
+
+	lda CIA2_PRA                       // bits 6 and 7
+	and #%11000000
+	pha
+
+	// XXX check for EOI here
+
+	// XXX decode byte instead of this - can we do it in real time? 
+	pla                                // bits 6 and 7
+	pla                                // bits 4 and 5
+	pla                                // bits 2 and 3
+	pla                                // bits 0 and 1
 
 
 	// Re-enable sprites
 	pla
-	lda VIC_SPENA
+	sta VIC_SPENA
 
 	rts
 

c64/kernal/iec/iec_jiffydos_bittable.s

@@ -1,7 +1,8 @@
 
 //
 // Helper table for encoding lower nibble for JiffyyDOS,
-// values found by observing the actual transfer
+// values found by observing the actual transfer using
+// original ROMs
 //
 
 #if CONFIG_IEC_JIFFYDOS

c64/kernal/iec/iec_rx_dispatch.s

@@ -10,23 +10,13 @@
 iec_rx_dispatch:
 
 	lda IECPROTO
+
 #if CONFIG_IEC_JIFFYDOS
 	cmp #$01
-	beq iec_rx_dispatch_jiffydos
+	beq_far iec_rx_byte_jiffydos
 #endif // CONFIG_IEC_JIFFYDOS
 
-	// FALLTROUGH
-
-iec_rx_dispatch_normal:
-
-	plp
 	jmp iec_rx_byte
 
-#if CONFIG_IEC_JIFFYDOS
-iec_rx_dispatch_jiffydos:
-	plp
-	jmp iec_rx_byte_jiffydos
-#endif // CONFIG_IEC_JIFFYDOS
-
 
 #endif // any turbo supported

c64/kernal/iec/iec_tx_byte.s

@@ -81,7 +81,6 @@ iec_jiffydos_detect_loop:
 	skip_2_bytes_trash_nvz
 
 iec_jiffydos_detected:
-
 	lda #$01                           // JiffyDOS protocol
 
 iec_jiffydos_store_proto:

c64/kernal/iec/iec_tx_dispatch.s

@@ -11,6 +11,7 @@ iec_tx_dispatch:
 
 	php                                // preserve C flag for EOI indication
 	lda IECPROTO
+
 #if CONFIG_IEC_JIFFYDOS
 	cmp #$01
 	beq iec_tx_dispatch_jiffydos