diff --git a/src/.gitignore b/src/.gitignore
index 2921dc0..2f8c9ea 100644
--- a/src/.gitignore
+++ b/src/.gitignore
@@ -1,2 +1 @@
 thhor.userrow
-*.s
diff --git a/src/Makefile b/src/Makefile
index 60c61e7..5d8d444 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -11,13 +11,22 @@ thhor_all: thhor.eeprom thhor.userrow
 CFLAGS_thhor = -Ibch4369 -DHAVE_FPGA -DSEND_HEX -DTHHOR
 MCU_thhor = attiny3224
 SN_thhor = 1
-# Link order defines ADC packet composition
-# main() is first, with .bss.magic
-# config.c includes .eeprom `port_config`, that should go second
-# .bss: rtc, adc, flash, uart, spi, pipe
-C_FILES_thhor = config.c rtc.c adc.c flash.c uart.c cmd.c base85.c pwm.c spi.c bch4369.c pipe.c fpga.c
+C_FILES_thhor = config.c uart.c cmd.c base85.c rtc.c adc.c pwm.c spi.c flash.c bch4369.c pipe.c fpga.c
 S_FILES_thhor = uart_tx.S base85a.S
 
+dose_all: dose.eeprom dose.userrow
+SN_dose = 1
+MCU_dose = $(MCU_$(VAR))
+MCU_nFETs = attiny424
+MCU_FPGA = attiny3224
+
+VAR=nFETs
+C_FILES_nFETs = 
+C_FILES_FPGA = fpga.c
+CFLAGS_dose  = -DHAVE_$(VAR)
+C_FILES_dose = config.c rtc.c adc.c pwm.c $(C_FILES_$(VAR)) uart.c cmd.c pipe.c base85.c bch4369.c spi.c flash.c
+S_FILES_dose = uart_tx.S base85a.S
+
 MCU = $(MCU_$(PROJ))
 OPT = -Os
 
@@ -73,24 +82,23 @@ pMCU-attiny824 = t824
 pMCU-attiny3224 = t3224
 
 # WDT
-fuse0_thhor= 0x00
+fuse0_dose= 0x00
 # BOD
-fuse1_thhor= 0x00
+fuse1_dose= 0x00
 # OSC, 20 MHz
-fuse2_thhor= 0x7e
-# Reserved
-fuse3_thhor= 0xff
-# Reserved
-fuse4_thhor= 0xff
+fuse2_dose= 0x7e
+# ???
+fuse4_dose= 0xff
 # SYS0 (default 0xf6)  RESET, EEPROM erase
-fuse5_thhor= 0xf7
+fuse5_dose= 0xf7
 # SYS1 startup time (64ms)
-fuse6_thhor= 0xff
+fuse6_dose= 0xff 
 # APPEND
-fuse7_thhor= 0x00
+fuse7_dose= 0x00 
 # BOOTEND
-fuse8_thhor= 0x00
-fuses_thhor =$(patsubst %, 0x%, 00 00 7e ff ff f7 ff 00 00)
+fuse8_dose= 0x00
+fuses_dose =$(patsubst %, 0x%, 00 00 7e ff ff f7 ff 00  00)
+fuses_thhor = $(fuses_dose)
 
 AVRDUDEPROG = avrdude
 AVRDUDE = $(AVRDUDEPROG)
@@ -99,6 +107,8 @@ AVRDUDE_PORT = /dev/ttyUSB0
 
 AD = $(AVRDUDE) -p $(pMCU-$(MCU)) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER)
 
+
+
 sig_dose = 0x1e 0x92 0x2c
 sig_thhor = 0x1e 0x95 0x28
 
diff --git a/src/cmd.c b/src/cmd.c
index b687341..dd3edc5 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -244,38 +244,17 @@ void parse_command(const uint8_t *s, uint8_t n)
 			goto send_buffer;
 		break;
 	case 'P':
-		if (cmd_flag('!'))
-			pipe.dest = 0;
 		if (have_b)
-			pipe_config((void*)cmd_buffer, (void*)bptr);
+			pipe_config((void*)cmd_buffer);
 		r = pipe_poll();
 		break;
 #ifdef HAVE_FPGA
 	case 'O':
 		r = fpga_power();
-		if (bflg & 1)
-			// "O1" power off
+		if (bflg == 1)
 			fpga_power_off();
-		if (bflg >= 2) {
-			// "O2" power on
+		else if (bflg == 2)
 			fpga_power_on();
-			if (!r) {
-				fpga_reset();
-				break;
-			}
-		}
-		if (bflg <= 2)
-			break;
-		if (bflg <= 8 && r==as_configured)
-			// "O2": configure if unconfigured
-			break;
-		if (bflg & 8) {
-			// "O3": power of if unconfigured
-			fpga_power_off();
-			break;
-		}
-		// "O4" configure unconditionally
-		fpga_config(config.fpga_config_page, config.fpga_config_count);
 		break;
 	case 'C':
 		if (cmd_flag('@')) {
diff --git a/src/config.h b/src/config.h
index 3412198..39d346d 100644
--- a/src/config.h
+++ b/src/config.h
@@ -23,8 +23,6 @@ struct config {
 	uint16_t  pwm_min;
 	uint16_t  pwm_max;
 #endif
-	uint16_t  fpga_config_page;
-	uint16_t  fpga_config_count;
 };
 
 enum magic_flags {
@@ -34,7 +32,7 @@ enum magic_flags {
 #endif
 #ifdef HAVE_FPGA
 	MAGIC       = 0xC5,
-	VERSION     = 0x00,
+	VERSION     = 0x01,
 #endif
 };
 
@@ -161,8 +159,6 @@ extern struct magic {
 #if 0
 #define _memcopy memcpy
 #define _memcopyyz memcpy
-#define _memcopyzy memcpy
-#define _memcmpyz memcmp
 #else
 // avoid the avr-libc memcpy.
 // ¡ n must not be zero !
@@ -196,43 +192,6 @@ void _memcopyyz(uint8_t *d, uint8_t *s, uint8_t n)
 		:: "r0", "memory");
 }
 
-static inline
-void _memcopyzy(uint8_t *d, uint8_t *s, uint8_t n)
-{
-	__asm__ volatile ("\n"
-		"1:"		"\n\t"
-		"ld r0, Y+"	"\n\t"
-		"st Z+, r0"	"\n\t"
-		"dec %[N]"	"\n\t"
-		"brne 1b"	"\n"
-		: [D] "+z" (d),
-		  [S] "+y" (s),
-		  [N] "+r" (n)
-		:: "r0", "memory");
-}
-
-static inline
-uint8_t _memcmpyz(uint8_t *d, uint8_t *s, uint8_t n)
-{
-	uint8_t r;
-	__asm__ volatile (
-		"\n"
-		"1:"		"\n\t"
-		"ld %[R], Y+"	"\n\t"
-		"ld r0, Z+"	"\n\t"
-		"sub %[R], r0"	"\n\t"
-		"breq 1f"	"\n\t"
-		"dec %[N]"	"\n\t"
-		"brne 1b"	"\n"
-		"1:"		"\n"
-		: [D] "+x" (d),
-		  [S] "+y" (s),
-		  [N] "+r" (n),
-		  [R] "=r" (r)
-		:
-		: "r0", "memory");
-	return r;
-}
 
 #endif
 
diff --git a/src/eeprom.ld b/src/eeprom.ld
index b72db90..0654d25 100644
--- a/src/eeprom.ld
+++ b/src/eeprom.ld
@@ -4,14 +4,14 @@
 */
 MEMORY 
 {
-    eemap (rw!x) : ORIGIN = 0x801400, LENGTH = 0x100
-    eedef (rw!x) : ORIGIN = 0x810000, LENGTH = 0x100
-    uumap (rw!x) : ORIGIN = 0x801300, LENGTH = 0x020
-    uudef (rw!x) : ORIGIN = 0x850000, LENGTH = 0x020
+    eemap   : ORIGIN =   0x1400,  LENGTH = 0x100
+    eedef   : ORIGIN = 0x810000,  LENGTH = 0x100
+    uumap   : ORIGIN =   0x1300,  LENGTH = 0x20
+    uudef   : ORIGIN = 0x850000,  LENGTH = 0x20
 }
 SECTIONS
 {
-    .eemap 0x801400:
+    .eemap 0x1400:
     {
 	ee1_start = .;
 	*(.eeprom1)
@@ -22,7 +22,7 @@ SECTIONS
 	ee9_end = .;
 	ee9_size = ee9_end - ee9_start;
     } >eemap AT >eedef
-    .uumap 0x801300:
+    .uumap 0x1300:
     {
         *(.userrow)
     } >uumap AT >uudef
diff --git a/src/flash.h b/src/flash.h
index 46af975..c509eee 100644
--- a/src/flash.h
+++ b/src/flash.h
@@ -28,7 +28,6 @@ uint8_t flash_cmd(uint16_t mode, uint16_t what, uint16_t page, uint16_t byte);
 extern uint8_t flash_buffer[FB_SIZE];
 uint8_t flash_submit_command(uint8_t *cmd);
 uint8_t flash_start_stream(uint16_t page, uint16_t npages, uint8_t flags);
-uint8_t flash_stream_done();
 uint8_t flash_poll(uint8_t rr);
 uint16_t flash_find_free();
 
@@ -54,6 +53,4 @@ enum {
 	FS_528   = 128, // do 528 byte pages.
 };
 
-static inline uint8_t flash_current_block() { return fs.block; }
-
 #endif
diff --git a/src/fpga.c b/src/fpga.c
index 8b7a770..07d549d 100644
--- a/src/fpga.c
+++ b/src/fpga.c
@@ -2,7 +2,6 @@
 #include "pipe.h"
 #include "fpga.h"
 #include "spi.h"
-#include <string.h>
 
 uint8_t fpga_reset_poll()
 {
@@ -13,18 +12,6 @@ uint8_t fpga_reset_poll()
 	return r;
 }
 
-uint8_t fpga_status()
-{
-	uint8_t r = fpga_power();
-	// all three altera pins must be on the same PORT
-	if (r)
-		r |= CRCERR_VPORT.IN &
-			( 1<<nCONFIG_PIN
-			| 1<<nSTATUS_PIN
-			| 1<<CRCERR_PIN );
-	return r;
-}
-
 void fpga_reset()
 {
 	nCONFIG_VPORT.OUT &=~ (1<<nCONFIG_PIN);
@@ -37,8 +24,8 @@ void fpga_cmd(struct fpga_cmd *c)
 {
 	uint8_t n = c->n;
 	uint8_t z = c->z;
-	if (fpga_status() != as_configured) {
-		c->n = n | fpga_dead;
+	if (fpga_reset_poll()) {
+		c->n = n | fpga_busy;
 		return;
 	}
 	if (n & fpga_abort && spi_abort()) {
@@ -54,7 +41,7 @@ void fpga_cmd(struct fpga_cmd *c)
 		return;
 	c->n = n | fpga_submitted;
 
-	spi_select(n & fpga_configure ? SPI_CONFIG : 0);
+	spi_select(n & fpga_config ? SPI_CONFIG : 0);
 	spi.csize = n &= fpga_size;
 	spi.zero = z & 0x80; // send 0x0000 or 0x8080
 	spi.cmd = c->d;
@@ -75,106 +62,25 @@ void fpga_cmd(struct fpga_cmd *c)
 	spi_start();
 }
 
-struct pipe_fpga_cmd pipe_fpga_cmd;
-
-uint8_t fpga_start_write()
+void fpga_start(uint8_t write)
 {
-	uint8_t mode = pipe.fpga.status & SPI_CONFIG;
+	uint8_t mode = 0;
+	if (pipe.fpga.zero == SPI_CONFIG)
+		mode = SPI_CONFIG;
 	spi_select(mode);
+	_memcopy(&spi.csize, &pipe.fpga.csize, 6);
+	spi.cmd = pipe.fpga.cmd;
 	spi.wdata = flash_buffer;
-	uint8_t n = 32;
-	if (pipe.fpga.count)
-		pipe.fpga.count--;
-	else {
-		uint8_t nn = pipe.fpga.size;
-		if (nn < n)
-			n = nn;
-		pipe.fpga.size -= n;
-	}
-	spi.wsize = n<<1;
-	if (n)
-		spi_start();
-	return n;
-}
-
-uint8_t fpga_start_read()
-{
-	/************************************************************
-	 * Send `counts` commands to the FPGA.
-	 * Read `size` Words from each command.
-	 * Fill the `flash_buffer` with 32 Words.
-	 * AS_CONT:
-	 *     Continue reading Words after the buffer was used.
-	 * User resets spi.fpga.val when done.
-	 * Return the number of Words to be read now.
-	 ***********************************************************/
-
-	if (spi_select(0))
-		return 0;
-	if (fpga_status() != as_configured)
-		return 0;
-	if (!pipe.fpga.val)
-		memset(flash_buffer, 0, 64);
-	uint8_t n = 64 - pipe.fpga.val;
+	spi.rdata = flash_buffer;
+	uint8_t n = 64;
+	if (n > pipe.fpga.size)
+		n = pipe.fpga.size;
+	pipe.fpga.size -= n;
 	if (!n)
-		return n;
-	spi.rdata = flash_buffer + pipe.fpga.val;
-	n >>= 1;
-	if (~pipe.fpga.status & AS_CONT) {
-		if (!pipe.fpga.count)
-			return 0;
-		pipe.fpga.count--;
-		spi.cmd = pipe_fpga_cmd.cmd;
-		_memcopy((void*)&spi.csize, (void*)&pipe_fpga_cmd, 6);
-		pipe.fpga.pos = 0;
-		pipe.fpga.status |= AS_CONT;
-	}
-	uint8_t nn = pipe.fpga.size - pipe.fpga.pos;
-	if (nn && nn < n)
-		n = nn;
-	pipe.fpga.pos += n;
-	if (pipe.fpga.pos == pipe.fpga.size)
-		pipe.fpga.status &=~ AS_CONT;
-	spi.rsize = n << 1;
-	pipe.fpga.val += spi.rsize;
-	spi_start();
-	return n;
-}
-
-uint8_t fpga_pipe_ready()
-{
-	/************************************************************
-	 * Return the number of valid Words read in to the buffer,
-	 * when
-	 *   - the FPGA is alive, and
-	 *   - the buffer is full, or
-	 *   - there is nothing more to read.
-	 * Reset pipe.fpga.val, when returning nonzero,
-	 * assuming those Words will be used now.
-	 ***********************************************************/
-
-	uint8_t r  = pipe.fpga.val;
-	if (fpga_status() != as_configured)
-		return 0;
-	if (r >= 64 || !pipe.fpga.count && ~pipe.fpga.status & AS_CONT)
-		pipe.fpga.val = 0;
+		return;
+	if (write)
+		spi.wsize = n;
 	else
-		r = 0;
-	return r;
-}
-
-const struct pipe pipe_config_fpga_config = {
-	.source = pipe_flash,
-	.dest = pipe_fpga,
-	.fpga = {
-		.status = AS_CONFIG,
-	},
-};
-
-void fpga_config(uint16_t page, uint16_t count)
-{
-	fpga_reset();
-	pipe = pipe_config_fpga_config;
-	pipe.fpga.count = count;
-	flash_start_stream(page, count>>8, FS_Read|FS_528);
+		spi.rsize = n;
+	spi_start();
 }
diff --git a/src/fpga.h b/src/fpga.h
index 7576d36..109d992 100644
--- a/src/fpga.h
+++ b/src/fpga.h
@@ -13,8 +13,7 @@ enum fpga_flags {
 	fpga_aborted   = 0x10,
 	fpga_busy      = 0x20,
 	fpga_submitted = 0x40,
-	fpga_configure = 0x80,
-	fpga_dead      = 0x80,
+	fpga_config    = 0x80,
 
 	fpga_wait_nonzero = 0x01,
 };
@@ -22,21 +21,8 @@ enum fpga_flags {
 void fpga_reset();
 uint8_t fpga_reset_poll();
 void fpga_cmd(struct fpga_cmd *c);
-uint8_t fpga_start_read();
-uint8_t fpga_start_write();
-uint8_t fpga_pipe_ready();
-void fpga_config(uint16_t page, uint16_t count);
+void fpga_start(uint8_t write);
 
 static inline uint8_t fpga_power() { return !!(PEN_VPORT.IN & (1<<PEN_PIN)); }
 static inline void fpga_power_on() { PEN_VPORT.OUT |= 1<<PEN_PIN; }
 static inline void fpga_power_off() { PEN_VPORT.OUT &=~ (1<<PEN_PIN); }
-
-enum fpga_status_values {
-	as_off  = 0,
-	as_on   = 1,
-	as_reset = as_on | 1<<CRCERR_PIN,
-	as_configured  = as_on | 1<<nCONFIG_PIN | 1<<nSTATUS_PIN,
-	as_crcerror = as_configured | 1<<CRCERR_PIN,
-};
-
-uint8_t fpga_status();
diff --git a/src/pipe.c b/src/pipe.c
index edd4c60..4643230 100644
--- a/src/pipe.c
+++ b/src/pipe.c
@@ -11,120 +11,51 @@
 
 section_status(pipe) struct pipe pipe;
 
-__attribute__((noinline))
-uint8_t pipe_busy()
-{
-	// Return true if anything is due to irq
-	// call this with cli() before sei();sleep()
-	if (spi_busy_p()) return 1;
-	if (flash_poll(0) & FS_Busy) return 1;
-	if (adc_poll(0)) return 1;
-	return 0;
-}
-
 uint8_t pipe_poll()
 {
-	/************************************************************
-	 * Drive data in `flash_buffer` from `source` to `dest`
-	 * `pipe_cmd`:
-	 *     data comes and goes via cmd("B…")
-	 *     `pipe.valid` controls if a buffer was fully transfered
-	 * `pipe_flash`:
-	 *     read or write pages from,to flash
-	 *     `PS_528`: use all 528 bytes
-	 *     `PS_BCH`: compute or check the BCH codes
-	 * `pipe_adc`: (source)
-	 *      Fill the buffer with ADC readings and further status
-	 * `pipe_fpga`:
-	 *      Configure the FPGA
-	 *      Write to the FPGA
-	 *      Read from the FPGA, with commands
-	 ***********************************************************/
-
-	// Return, if
-	//    any hardware is busy,
-	//    an FS_Error occured, or
-	//    the data goes nowhere.
 	uint8_t r = pipe.status;
-	uint8_t dest = pipe.dest;
-
-	if (pipe_busy() || !dest)
-		return r;
+	uint8_t fl = flash_poll(0);
+	if (spi_busy_p() || fl & FS_Busy || adc_poll(0))
+		goto done;
 #ifdef HAVE_FPGA
-	// we need to wait at least until the FPGA raises nCONFIG
-	if (dest & pipe_fpga && fpga_reset_poll())
-		return r;
+	if (fpga_reset_poll())
+		goto done;
 #endif
-
-	uint8_t valid = pipe.valid;
-
 	if (r & PS_OUT) {
-		// Sending the buffer to `dest`.
-		// Return if we are not done sending to all destinations.
-
-		if (dest & pipe_cmd && valid & 0x1f)
+		if (pipe.dest & pipe_cmd && pipe.valid & 0x1f)
 			// cmd did not drain the buffer, yet
 			goto done;
-		if (dest & pipe_flash && ~fs.status & FS_Ready)
-			// flash did not finish yet, successfully
+		if (pipe.dest & pipe_flash && !(fl & FS_Ready))
+			// flash did not finish successfully
+			goto done;
+		if (pipe.source & pipe_adc && !adc_poll(pipe.adc))
 			goto done;
 
 		// fpga is OUT when the spi is ready.
 		// We are done with this buffer
-
-		r &=~ PS_OUT;
-
-		// Return if next ADC reading is not yet due.
-		// Come back here, until is is.
-
-		if (pipe.source & pipe_adc && !adc_poll(pipe.adc))
-			goto done;
-
-		// Continue the flash stream.
-		// PS_BLK is the 64-Bytes buffer number in the page
-
-		valid = 0;
-		if (pipe.source & pipe_flash) {
-			r &= ~ PS_BLK;
-			r |= flash_current_block() & PS_BLK;
+		pipe.valid = 0;
+		if (pipe.source & pipe_flash)
 			flash_poll(1);
-		}
 #ifdef HAVE_FPGA
-		// Continue the FPGA stream.
-
-		else if (pipe.source & pipe_fpga) {
-			if (~fpga_start_read())
-				pipe.source &=~ pipe_fpga;
-		}
+		else if (pipe.source & pipe_fpga)
+			fpga_start(0);
 #endif
+		r &=~ (PS_OUT|4);
+		r++;
 		goto done;
 	}
 
-	// Waiting for the buffer to fill
-
-	// For 528 bytes pages, the last buffer must be 80 Bytes,
-	// i.e., five cmd_buffers á 16 Bytes
 	uint8_t bflgs = 0x0f;
 	if ((r & PS_5) == PS_5)
 		bflgs = 0x1f;
 
-	// Data from the ADC is in named .bss segments. We send
-	// 16, 32, or 64 Bytes from the .bss segement for ead ADC reading.
-	// The first named .bss segment is `magic`.  Observe the link order
-	// in the Makefile.
-	//
-	// Fun with assembly.
-	// `n` is the number of bytes, [16, 32, 64]
-	// `o` is the addr in the flash_buffer
-	// `v` are the currently valid cmd_buffer flags
-	// `f` are the fresh valid cmd_buffer flags
 	if (pipe.source & pipe_adc) {
 		uint8_t n = pipe.adc & 0x70;
 		if (!n)
 			goto adc_done;
 		uint8_t f = n-1;
 		uint8_t o = -16;
-		uint8_t v = valid;
+		uint8_t v = pipe.valid;
 #if 0
 		uint8_t c;
 		do {
@@ -153,101 +84,49 @@ uint8_t pipe_poll()
 			f = 0xff;
 			n = 64-o;
 		}
-		valid |= f>>4;
+		pipe.valid |= f>>4;
 		_memcopy(flash_buffer+o, (void*)&magic, n);
 	}
 adc_done:
 
-	// When the flash is done, flag the buffer valid,
-	// including BCH Bytes.
-	if (pipe.source & pipe_flash && fs.status & FS_Ready)
-		valid = bflgs;
+	if (pipe.source & pipe_flash && fl & FS_Ready)
+		pipe.valid = bflgs;
 #ifdef HAVE_FPGA
-	// The FPGA delivers 64 Bytes.
-	else if (pipe.source & pipe_fpga && fpga_pipe_ready())
-		valid = 0x0f;
+	else if (pipe.source & pipe_fpga)
+		pipe.valid = 0x0f;
 #endif
-	// The buffer is not here, yet.  Nothing we can do now.
-	if (~valid & 0x0f)
+	if (~pipe.valid & 0x0f)
 		goto done;
-
-	// The buffer shall include BCH Bytes.
 	if (r & PS_BCH) {
-		// First buffer of a page, clear the parity
-		if (!(r & PS_BLK))
+		if (!(r&3))
 			bch4369_init(config.bch_salt);
-		// Add the current buffer to the parity
 		uint8_t *bend = bch4369_stri(flash_buffer, 64);
-		// Last buffer of the page:
-		if (!(~r & PS_BLK)) {
-			bch4369_fini();
-			valid = 0x01f;
-			// When the Flash is not the source,
-			// copy the computed parity into the buffer.
-			if (~pipe.source & pipe_flash)
-				_memcopyyz(bend, bch_parity, 16);
-			// When the page as read from flash has invalid parity,
-			// stop writing to the FPGA.
-			else if (_memcmpyz(bch_parity, bend, 16)) {
-				dest &=~ pipe_fpga;
-				r |= PS_ERR;
-			}
+		if (!(~r & 3)) {
+			// reuse Y=bend
+			_memcopyyz(bend, bch_parity, 16);
+			pipe.valid = 0x01f;
 		}
 	}
-	// We still do not have all data we need
-	if (~valid & bflgs)
+	if (~pipe.valid & bflgs)
 		goto done;
 
-	// The buffer is full, send it.
-	r |= PS_OUT;
-
 #ifdef HAVE_FPGA
-	// Resume the FPGA stream
-	if (dest & pipe_fpga & ~fpga_start_write())
-		dest &=~ pipe_fpga;
-	else
+	if (pipe.dest & pipe_fpga)
+		fpga_start(1);
 #endif
-	// Resume the flash stream
-	if (dest & pipe_flash) {
-		r &= ~ PS_BLK;
-		r |= flash_current_block() & PS_BLK;
-		flash_poll(1);
-		if (flash_stream_done())
-			dest &=~ pipe_flash;
-	}
 
+	r |= PS_OUT;
 done:
-	pipe.dest = dest;
-	pipe.valid = valid;
 	pipe.status = r;
 	return r;
 }
 
-void pipe_config(const struct pipe_config *c, const struct pipe_fpga_cmd *a)
+void pipe_config(const struct pipe_config *c)
 {
-	/************************************************************
-	 * cmd("B0!", «fpga-cmd»)  optionally configure an FPGA cmd
-	 * cmd("P0:, «pipe-cfg»)    with `AS_CMD` in `.status`
-	 ***********************************************************/
-
-	if (c->pipe.dest) {
-		pipe = c->pipe;
-		if ((pipe.source | pipe.dest) & pipe_flash)
-			flash_start_stream(c->page, c->npages, c->flash);
-	}
-	else {
-		// new source (NOT flash)
-		pipe.source = c->pipe.source;
-	}
+	pipe = c->pipe;
+	if ((pipe.source | pipe.dest) & pipe_flash)
+		flash_start_stream(c->page, c->npages, c->flash);
 	if (pipe.source & pipe_adc)
 		adc_start_stream(pipe.adc);
-#ifdef HAVE_FPGA
-	if (pipe.source & pipe_fpga) {
-		if (a && pipe.fpga.status & AS_CMD)
-			_memcopyzy((void*)&pipe_fpga_cmd, (void*)a, sizeof(*a));
-		else
-			memset(&pipe_fpga_cmd, 0, sizeof(*a));
-		fpga_start_read();
-	}
-#endif
 }
+
diff --git a/src/pipe.h b/src/pipe.h
index 9d9c3f7..bb23d65 100644
--- a/src/pipe.h
+++ b/src/pipe.h
@@ -8,15 +8,10 @@ enum pipe_ports {
 	pipe_fpga  = 8,
 
 	PS_OUT =  0x80,
-	PS_ERR =  0x40,
-	PS_BCH =  0x20,
-	PS_528 =  0x10,
-	PS_BLK =  0x07,
+	PS_BCH =  0x10,
+	PS_528 =  0x08,
+	PS_BLK =  0x03,
 	PS_5   =  PS_BLK | PS_528, // need 16 bytes more
-
-	AS_CONT = 1,
-	AS_CONFIG = SPI_CONFIG, // = 2
-	AS_CMD =  4,
 };
 
 extern
@@ -28,11 +23,14 @@ struct pipe {
 	uint8_t adc;
 #ifdef HAVE_FPGA
 	struct {
-		uint8_t status; // AS_…
-		uint16_t count; // number of cmds(read), 64 Bytes(write)
-		uint8_t size; // Words per cmd (read), extra Words (write), 0==256
-		uint8_t val; // Valid Bytes in Buffer (read)
-		uint8_t pos; // Words read from current cmd (read)
+		uint16_t size;
+		uint8_t cmd[4];
+		uint8_t csize;
+		uint8_t zsize;
+		uint8_t isize;
+		uint8_t zero;
+		uint8_t wait;
+		uint8_t mask;
 	} fpga;
 #endif
 } pipe;
@@ -44,18 +42,6 @@ struct pipe_config {
 	uint8_t  flash;
 };
 
-extern
-struct pipe_fpga_cmd {
-	uint8_t csize;
-	uint8_t zsize;
-	uint8_t isize;
-	uint8_t zero;
-	uint8_t wait;
-	uint8_t mask;
-	uint8_t cmd[10];
-} pipe_fpga_cmd;
-
-uint8_t pipe_busy();
 uint8_t pipe_poll();
 void pipe_cron();
-void pipe_config(const struct pipe_config *c, const struct pipe_fpga_cmd *a);
+void pipe_config(const struct pipe_config *c);
diff --git a/src/spi.c b/src/spi.c
index 85cf3fa..b1425ac 100644
--- a/src/spi.c
+++ b/src/spi.c
@@ -31,11 +31,6 @@ ISR(SPI0_INT_vect)
 			d = spi.zero;
 		}
 		else if (spi.wsize) {
-			// TODO:
-			// spi.csize = spi.wsize;
-			// spi.wsize = 0;
-			// spi.cmd = spi.wdata;
-			// goto repeat;
 			spi.wsize--;
 			d = *spi.wdata++;
 		}
diff --git a/src/thhor.c b/src/thhor.c
index e6a2869..32f291a 100644
--- a/src/thhor.c
+++ b/src/thhor.c
@@ -40,17 +40,8 @@ int main()
 	send_hex_byte_eol(magic.reset_source);
 
 	while (1) {
-		// The pipe may become idle before we reach sleep.
-		// Make sure we have nothing to do before we sleep.
-		// The sleep command will execute even when an irq
-		// is pending.  It will wake us immediately.
-		cli();
-		if (!command_pending() && (!pipe.dest || pipe_busy())) {
-			sei();
-			sleep_cpu();
-		}
 		sei();
+		sleep_cpu();
 		command();
-		pipe_poll();
 	}
 }
diff --git a/src/uart.h b/src/uart.h
index f06a422..6438874 100644
--- a/src/uart.h
+++ b/src/uart.h
@@ -26,10 +26,3 @@ void send_hex_long(uint32_t b)
 
 extern uint8_t uart_rx_err;
 extern uint8_t uart_rx_errors;
-extern volatile uint8_t uart_rx_mes;
-
-static inline
-uint8_t command_pending()
-{
-	return uart_rx_mes;
-}