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+The SQ50 consists of the following components:
+
+### BOM
+
+* Top side:
+  * LED: status (green: application mode: orange: bootloader mode)
+  * MicroUSB-connector (to the host computer)
+  * 5-pin 2.54mm pin header, for probe IO
+  * Xilinx Spartan XC3S50AN TQG144AGQ1917 D5886160A 4C (QFP-144) ([datasheet with pinout](https://www.xilinx.com/support/documentation/data_sheets/ds557.pdf), [internal flash memory docs](https://www.xilinx.com/support/documentation/user_guides/ug333.pdf))
+  * ISSI IS61WV25616EDBLL-10TLI EAB217P5 1950 (RAM used for storing samples)
+  * FTDI HWJFS.00 FT240XQ 1741-D (USB interface) ([product info](https://ftdichip.com/products/ft240xq/), [datasheet](https://ftdichip.com/wp-content/uploads/2020/08/DS_FT240X.pdf), [proprietary drivers used by ScanaStudio](https://www.ftdichip.com/Drivers/D2XX/Linux/libftd2xx-x86_64-1.4.8.gz))
+  * TI OPA 4354A 912Q (quad opamp, [product info](https://www.ti.com/product/OPA4354))
+  * A number of analog components
+* Bottom side:
+  * 8-pin 2mm pin header/connector (JTAG)
+  * 3 empty slots/solder pads for more ISSI chips (probably used in the SQ100/SQ200 variants)
+  * Empty solder pads for a SOIC-8 chip for unknown purpose
+  * 147776 TP949 6EAL (QFN-16, unknown purpose)
+  * A crystal oscillator, frequency/markings are impossibly tiny to read
+
+### Photos
+
+Outer shell:
+
+![](https://cloud.lain.faith/apps/files_sharing/publicpreview/keFQb8DaK8m66QP?fileId=21068&file=/sq501.jpeg&x=1920&y=1080&a=true)
+
+Top side of the PCB:
+
+![](https://cloud.lain.faith/apps/files_sharing/publicpreview/keFQb8DaK8m66QP?fileId=21069&file=/sq503.jpeg&x=1920&y=1080&a=true)
+
+Bottom side of the PCB:
+
+![](https://cloud.lain.faith/apps/files_sharing/publicpreview/keFQb8DaK8m66QP?fileId=21070&file=/sq502.jpeg&x=1920&y=1080&a=true)
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