Update boot test to check registers on completion of boot

gbdb_boot_test

@@ -31,8 +31,6 @@ runto 0xc
 assert $pc == 0xc
 assert $hl == 0x7fff
 
-# TODO: There is a bug in GBDB where breakpoints fire at the start of an
-# instruction and "step" stops at the end of an instruction
 step; step
 assert $pc == 0xf
 assert $hl == 0xff26
@@ -208,10 +206,22 @@ assert $pc == 0xe0
 runto 0xf4
 assert $pc == 0xf4
 
+#
+# Based on http://bgb.bircd.org/pandocs.htm#powerupsequence these are the values
+# the registers should hold after the boot process is done
+#
+
 runto 0x100
 assert $pc == 0x100
-echo Test passed!
+assert $af == 0x01b0
+assert $bc == 0x0013
+assert $de == 0x00d8
+assert $hl == 0x014d
+
+#
+runto 0x2213
+
 regs
 stat
 
-exit
+# exit