128 - MMU modify page select
129 - MMU modify bank select
130 - MMU data
132 - MMU active map select (same as out 7)
136 - Revision ROM address
137 - Revision ROM data
144 - turbo
148 - LED control
149 - Green LEDs
150 - 7seg right
151 - 7seg left
152 - Red LEDs 7:0
153 - Red LEDs 9:8
158 - FGCTL
159 - FG 16K page select
160 - GPIO pin read 7:0
161 - GPIO pin read 15:8
162 - GPIO pin read 23:16
163 - GPIO pin read 31:24
164 - GPIO pin read 35:32
165 - GPIO output data 7:0
166 - GPIO output data 15:8
167 - GPIO output data 23:16
168 - GPIO output data 31:24
169 - GPIO output data 35:32
170 - GPIO control (0 = input, 1 = output) 7:0
171 - GPIO control (0 = input, 1 = output) 15:8
172 - GPIO control (0 = input, 1 = output) 23:16
173 - GPIO control (0 = input, 1 = output) 31:24
174 - GPIO control (0 = input, 1 = output) 35:32
175 - GPIO set a single bit:
      bits 5:0 = GPIO number (0-35)
      bit  6   = GPIO control
      bit  7   = GPIO output data