diff --git a/README.md b/README.md
index b3a00141e52b97e5442550ddd9e2eefc929a24b4..5b4c1b7da2b7f9bd108cf116b51244459e7da1e3 100644
--- a/README.md
+++ b/README.md
@@ -37,11 +37,11 @@ Depending on your chip, you'll need to find a programmer (device, i.e. the Atmel
 
 While microcontrollers *include* tiny processors, they interface with the world with auxilliary circuits called **peripherals**. We can think of these like little bundled ASICs (application specific integrated circuits) that offload time-sensitive work from the processor. These also perform level shifting and current carrying capability.
 
-![die](XC2C32A_die.jpg)
+![die](images/XC2C32A_die.jpg)
 
 Here's the diagram for an XMEGA
 
-![xmega](xmega-blocks.png)
+![xmega](images/xmega-blocks.png)
 
 Some common peripherals:
  - [PORT / PIN for digital logic (high, low, input)](https://www.instructables.com/id/ATTiny-Port-Manipulation/)
@@ -54,7 +54,7 @@ Some common peripherals:
 
 If we imagine peripherals to be little machines that the processor operates, we can think of registers as *memory locations whose bits are switches* for those machines. This is a bit odd, but I find it a useful metaphor. When we write into register locations, we are switching these bits on and off.
 
-![handles](register.png)
+![handles](images/register.png)
 
 So! Figuring out which registers to read / write to is where we come to the datasheet. These provide extensive information on which registers do what, what order they need to be configured in, etc. 
 
@@ -66,9 +66,26 @@ So! Figuring out which registers to read / write to is where we come to the data
 
 Is a PITA, but hugely enabling. Here are two guides: [one](https://www.egr.msu.edu/classes/ece480/capstone/read_datasheet.pdf) and [two](https://www.sparkfun.com/tutorials/223). 
 
+## CBA Examples 
+
+ - [XMEGA: friendly, powerful](https://gitlab.cba.mit.edu/pub/hello-world/xmega)
+ - [NRF52: native wireless, fast ARM-core](https://gitlab.cba.mit.edu/pub/hello-world/nrf52)
+ - [ATSAMD51: 120MHz ARM M4, Adafruit Love](https://gitlab.cba.mit.edu/pub/hello-world/atsamd51)
+ - [ATSAMS70: 300MHz ARM M7](https://gitlab.cba.mit.edu/pub/hello-world/atsams70)
+
 ## Other Architectures
 
- - PSOC
- - FPGAs 
+### PSOCs
+
+Programmable Systems On a Chip are somewhere between FPGAs and Microcontrollers. They typically contain a microcontroller core with adaptable / configurable sets of peripherals. Very cool. Graphical language mixed with c code.
+
+![psoc](images/psoc.png)
+
+### FPGAs 
+
+FPGAs are reconfigurable everything-s. 
+
+![fpga](images/fpga-architecture.png)
 
- https://gitlab.cba.mit.edu/jakeread/coclocking
\ No newline at end of file
+[tinyfpga](https://tinyfpga.com/)
+[fpga4fun](https://www.fpga4fun.com/)
\ No newline at end of file
diff --git a/images/fpga-architecture.png b/images/fpga-architecture.png
new file mode 100644
index 0000000000000000000000000000000000000000..107d07a6769577d486e7334679fbe1f70decd92a
Binary files /dev/null and b/images/fpga-architecture.png differ
diff --git a/images/psoc.png b/images/psoc.png
new file mode 100644
index 0000000000000000000000000000000000000000..625fd4746ca0af2d7859bd4d332c10073720cf10
Binary files /dev/null and b/images/psoc.png differ