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diff --git a/doc/leo/leo.txt b/doc/leo/leo.txt
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+
+          BACKEND LEO
+
+Across Technologies FS-1130
+(A rebadged LEO Technologies)
+ 000: 06 31 14 01 1f 00 00 00 41 43 52 4f 53 53 20 20    .1......ACROSS  
+ 016: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                    
+ 032: 31 2e 31 36 09 f6 0d b6 01 2c 01 2c 39 36 30 30    1.16.....,.,9600
+
+
+LEO LEOScan S3:
+ 000: 06 31 14 01 1F 00 00 00 4C 45 4F 20 20 20 20 20    .1......LEO
+ 016: 4C 45 4F 53 63 61 6E 2D 53 33 20 20 20 20 20 20    LEOScan-S3
+ 032: 33 2E 30 31 09 F6 0D B6 01 2C 01 2C 39 36 30 30    3.01.....,.,9600
+
+or
+ 000: 06 00 02 02 1f 00 00 00 4c 45 4f 00 00 00 00 00    ........LEO.....
+ 016: 4c 45 4f 53 63 61 6e 2d 53 33 00 00 00 00 00 00    LEOScan-S3......
+ 032: 31 2e 31 30                                        1.10 
+
+Genius FS1130
+ 000: 06 31 14 01 1f 00 00 00 4b 59 45 20 43 4f 52 50    .1......KYE CORP
+ 016: 43 6f 6c 6f 72 50 61 67 65 2d 43 53 20 20 20 20    ColorPage-CS
+ 032: 31 2e 31 34                                        1.14 
+
+/*--------------------------------------------------------------------------*/
+
+SCSI commands supported by the FS-1130
+
+
+TEST UNIT READY
+00 00 00 00 00 00
+
+
+INQUIRY
+12 00 00 00 30 00
+   8-15: vendor name
+  16-31: product name
+  32-35: firmware level
+  36-37: scan area width in 1/300th of inches
+  38-39: scan area length in 1/300th of inches
+  40-41: max X resolution in dpi
+  42-43: max Y resolution in dpi
+  44-47: ?
+
+
+SCAN
+1B 00 00 00 00 00
+Start a scan
+
+
+SET WINDOW
+24 00 00 00 00 00 30 00 00 00
+Total length is 48 bytes
+  01 = 0x2E (may be 0x30 - 2, ie total length -2)  
+  07 = length (48-8 = 40 = 0x28)
+  10-11 = X Resolution
+  12-13 = Y resolution
+  14-17 = X top left corner
+  18-21 = Y top left corner
+  22-25 = width  (size in inches * 300)
+  26-29 = length (size in inches * 300)
+  31 = 0x80 ?
+  33 = scan mode
+        0x00 = black & white
+		0x01 = halftone
+        0x02 = grayscale
+        0x05 = color
+  34 = bit depth  
+        1 or 8
+  37 = ? RIF + other
+  43 = ? 0x01
+
+
+READ
+28 00 00 00 00 00 00 0B 28 00
+
+
+SEND
+2A 00 03 00 00 01 00 03 00 00 
+2A 00 02 00 00 0F 00 01 00 00
+  2 = data type code
+    0x02 = halftone pattern
+    0x03 = gamma - 3 colors with 256 bytes each
+
+
+GET DATA BUFFER STATUS
+34 00 00 00 00 00 00 00 10 00
+  7-8 allocation length
+
+  returned buffer is 0x10 bytes long.
+  00 00 0D 00 00 00 03 D3 60 00 00 00 01 48 00 EE 
+  
+    0-2 = additional length (0x10-3 = 0x0D)
+    6-8 = (?) total scan length
+   9-11 = filled data buffer
+  12-13 = number of lines left (decrease during a scan)
+  14-15 = bytes per line (constant during a scan)  
+
+
+/*--------------------------------------------------------------------------*/
+
+Command sequence for the FS-1130
+
+Setup the scan:
+  TUR
+  SET WINDOWS
+  SEND gamma
+  SEND haltone pattern (if halftone scan)
+  SCAN
+  TUR until scanner ready
+  GET DATA BUFFER STATUS
+
+loop until all data read:
+  GET DATA BUFFER STATUS
+  READ
+
+park the CCD:
+  SET WINDOWS
+  TUR
+  SCAN
+  
+/*--------------------------------------------------------------------------*/
+
+Command sequence for the S3
+
+It seems similar to the FS-1130 except that no gamma nor halftone pattern is sent.
+
+Setup the scan:
+  TUR
+  SET WINDOWS
+  SCAN
+  TUR until scanner ready
+
+loop until all data read:
+  GET DATA BUFFER STATUS
+  READ
+
+park the CCD:
+  SET WINDOWS
+  SCAN