diff --git a/arch/ibm/decoder.cc b/arch/ibm/decoder.cc
index 245c27fc..138a9341 100644
--- a/arch/ibm/decoder.cc
+++ b/arch/ibm/decoder.cc
@@ -138,7 +138,7 @@ void IbmDecoder::decodeSectorRecord()
     br.read_8(); /* skip ID byte */
     _sector->logicalTrack = br.read_8();
     _sector->logicalSide = br.read_8();
-    _sector->logicalSector = br.read_8() - _config.sector_base();
+    _sector->logicalSector = br.read_8() - _config.sector_id_base();
     _currentSectorSize = 1 << (br.read_8() + 7);
     uint16_t wantCrc = br.read_be16();
     uint16_t gotCrc = crc16(CCITT_POLY, bytes.slice(0, _currentHeaderLength + 5));
diff --git a/arch/ibm/ibm.proto b/arch/ibm/ibm.proto
index b218f53f..12bce43a 100644
--- a/arch/ibm/ibm.proto
+++ b/arch/ibm/ibm.proto
@@ -3,9 +3,12 @@ syntax = "proto2";
 import "lib/common.proto";
 
 message IBMInputProto {
-	optional int32 sector_base = 1 [default=0];
-	optional bool ignore_side_byte = 2 [default=false];
-	optional RangeProto required_sectors = 3;
+	optional int32 sector_id_base = 1 [default = 1,
+		(help) = "ID of first sector"];
+	optional bool ignore_side_byte = 2 [default = false,
+		(help) = "ignore side byte in sector header"];
+	optional RangeProto required_sectors = 3 [
+		(help) = "require these sectors to exist for a good read"];
 }
 
 message IBMOutputProto {
diff --git a/mkninja.sh b/mkninja.sh
index b61ff5de..7384d5c6 100644
--- a/mkninja.sh
+++ b/mkninja.sh
@@ -346,6 +346,7 @@ READABLES="\
     acornadfs \
     acorndfs \
     aeslanier \
+    ampro \
     amiga \
     brother \
     c64 \
diff --git a/src/fe-readampro.cc b/src/fe-readampro.cc
deleted file mode 100644
index d818e10d..00000000
--- a/src/fe-readampro.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-#include "globals.h"
-#include "reader.h"
-#include "ibm/ibm.h"
-#include "fmt/format.h"
-#include "readibm.h"
-
-int mainReadAmpro(int argc, const char* argv[])
-{
-	setReaderDefaultSource(":t=0-79:s=0");
-	setReaderDefaultOutput("ampro.adf");
-    setReaderRevolutions(2);
-	sectorIdBase.setDefaultValue(17);
-	return mainReadIBM(argc, argv);
-}
-
diff --git a/src/readables/acornadfs.textpb b/src/readables/acornadfs.textpb
index f1269d1f..e379fe1b 100644
--- a/src/readables/acornadfs.textpb
+++ b/src/readables/acornadfs.textpb
@@ -13,7 +13,7 @@ output {
 
 decoder {
 	ibm {
-		sector_base: 0
+		sector_id_base: 0
 	}
 }
 
diff --git a/src/readables/acorndfs.textpb b/src/readables/acorndfs.textpb
index 30706c2c..e3da75ce 100644
--- a/src/readables/acorndfs.textpb
+++ b/src/readables/acorndfs.textpb
@@ -13,7 +13,7 @@ output {
 
 decoder {
 	ibm {
-		sector_base: 0
+		sector_id_base: 0
 	}
 }
 
diff --git a/src/readables/ampro.textpb b/src/readables/ampro.textpb
new file mode 100644
index 00000000..a0a6b1b8
--- /dev/null
+++ b/src/readables/ampro.textpb
@@ -0,0 +1,30 @@
+input {
+	disk {
+		drive {}
+	}
+}
+
+output {
+	file {
+		filename: "ampro.img"
+		img {}
+	}
+}
+
+decoder {
+	ibm {
+		sector_id_base: 17
+	}
+}
+
+cylinders {
+	start: 0
+	end: 79
+}
+
+heads {
+	start: 0
+	end: 0
+}
+
+