turbo tape can now load files up to 250 blocks

CONFIG.md

@@ -141,7 +141,7 @@ Needs about 700 bytes in KERNAL segment (if both normal and turbo are enabled, a
 
 Adds a minimal turbo tape support - just LOAD command (device 7, like on _Action Replay_ and _Final_ cartridges)
 
-Needs about 600 bytes in KERNAL segment (if both normal and turbo are enabled, about 900 bytes are needed, as they share some code). If unsure - enable.
+Needs about 650 bytes in KERNAL segment (if both normal and turbo are enabled, about 950 bytes are needed, as they share some code). If unsure - enable.
 
 ## Multiple SID support
 

STATUS.md

@@ -3,19 +3,26 @@
 
 Here are the features of the Open ROMs not found in the original ROMs from the 80s (many of them are [configurable](CONFIG.md) during compilation):
 
+
 * improved keyboard scanning, resistant to ghosting and joystick interference (one variant even supports multi-keyy rollover), supports additional C128 keys
 * joystick can be used to move text cursor
 * pre-defined function keys
-* uses RAM under ROM and I/O: 61438 bytes free
+
-* cold/warm start silences multiple SID chips - all $D4xx and $D5xx addresses, configured addresses
+* JiffyDOS protocol support
-* warm start due to BRK prints out the instruction address
+* partial DolphinDOS protocol support (for now only LOAD is accelerated)
+* DOS wedge (direct mode only) - `@<drive_number>`, `@<command>`, `@$`, `@$<params>`, `@`
+
+* turbo tape load support (as device 7, or using `←L`), up to 250 blocks (can store bytes under I/O)
+
 * extended `LOAD` command
     * start/end addresses are displayed, in the Final cartridge style
     * command with just the file name tries to use the last device if it's number seems sane; otherwise uses 8
     * secondary address over 255 is considered a start address
-* JiffyDOS protocol support
+
-* turbo tape load support (as device 7 or using `←L`)
+* uses RAM under ROM and I/O: 61438 bytes free
-* DOS wedge (direct mode only) - `@<drive_number>`, `@<command>`, `@$`, `@$<params>`, `@`
+* cold/warm start silences multiple SID chips - all $D4xx and $D5xx addresses, configured addresses
+* warm start due to BRK prints out the instruction address
+
 
 NOTE: extra features and their syntax can change in the future!
 
@@ -33,7 +40,6 @@ The following ROM features are currently missing:
 * BASIC variables
 * BASIC expression parsing
 * floating point routines
-* tape (normal mode) support
 * RS-232 support
 * NMI handling is incomplete
 

c64/kernal/tape/load_tape_turbo.s

@@ -82,6 +82,18 @@ load_tape_turbo_header_loop:
 
 load_tape_turbo_payload:
 
+	// Copy helper byte store routine to RAM, provide default memory mapping
+
+	ldx #(__tape_turbo_bytestore_size - 1)
+!:
+	lda tape_turbo_bytestore_source, x
+	sta __tape_turbo_bytestore, x
+	dex
+	bpl !-
+
+	lda CPU_R6510
+	sta __tape_turbo_bytestore_defmap
+
 	// Initial checksum value
 
 	lda #$00
@@ -96,7 +108,7 @@ load_tape_turbo_payload:
 load_tape_turbo_loop:
 
 	jsr tape_turbo_get_byte
-	sta (MEMUSS),y
+	jsr __tape_turbo_bytestore         // like 'sta (MEMUSS),y' - but under I/O
 
 	eor PRTY                           // handle checksum
 	sta PRTY

c64/kernal/tape/tape_turbo_bytestore.s

@@ -0,0 +1,40 @@
+
+//
+// Tape (turbo) helper routine - storing byte uder I/O
+//
+
+// This helper routine is meant to be copiet to the start of CPU stack.
+// Original ROM tape loading routines uses this area to store information
+// about bytes that did not read properly for the first time
+// (see Mapping the C64, page 47); this mechanism is useless for turbo tape,
+// but it means we can safely use this area for our purposes
+
+
+#if CONFIG_TAPE_TURBO
+
+
+.label __tape_turbo_bytestore         = STACK
+.label __tape_turbo_bytestore_defmap  = __tape_turbo_bytestore + 7
+.label __tape_turbo_bytestore_size    = __tape_turbo_bytestore_source_end - tape_turbo_bytestore_source
+
+
+tape_turbo_bytestore_source:
+
+	// Set all memory as RAM, tape motor ON
+	ldx #$00
+	stx CPU_R6510
+
+	// Store byte in memory
+	sta (MEMUSS), y
+
+	// Restore default memory layout
+	ldx #$00                           // value will be determined later, offset from start: 7 bytes
+	stx CPU_R6510
+
+	// Go back
+	rts
+
+__tape_turbo_bytestore_source_end:
+
+
+#endif // CONFIG_TAPE_TURBO