Notes

From Spartan Blue CPU

The UART is hard coded to 57600/8/N/1

You can access it via memory or use it when in load mode to load words (high byte first, then low byte)

Memory map:

FF0 - Switch register (read/write)
FF1 - Actual switches (low 8 bit) + enter key (top bit) (read only)
FFE - UART Status (xmit buf empty, xmit shift empty, frame err, overflow, available, + 11 0 bits)
FFF - Uart character (read/write) on receive, bit 15 is character available flag

Front panel Switches:

0 - Reset
1 - Select (cycles LEDs from 0 to 5)
2 - Action (see below)
3 - Enter (see below) [ closest to slide switches]

LEDs:

7 - Q output
6 - Running 
5 - Run/Stop entry mode
4 - Step mode
3 - Deposit 
2 - Examine 
1 - Load PC 
0 - Register Select 

Meaning of the two rightmost buttons depends on state

State (from LED) Action Enter

5			Run/Stop	Enter
4			Step		Enter
3			Deposit		Enter
2			Examine		Enter
1			Load PC		Enter
0			Select register	Enter

When enter is held down, the switch register is shown in all modes

Decimal points on display (#4 is leftmost):

 4 - IR 
 3 - SW (stored during deposit)
 2 - AC (loaded during examine)
 1 - PC 

Flags

0=overflow
1=zero
2=carry (set on add and shift)