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; ram.s

; Copyright 2012-2013, Sinclair R.F., Inc.

;

; RAM definition for Conway's Game of Life, SSBCC.9x8 implementation

.memory RAM ram

; commanded mode

.variable       cmd_frame_waits         0       ; number of frames between updates

.variable       cmd_stop                0       ; don't propagate the state

.variable       cmd_wrap                0       ; wrap at the top/bottom and left/right boundaries

; internal status

.variable       cnt_frame_waits         0       ; current count against cmd_frame_waits

.variable       sel_rd                  0       ; index for ping pong buffer being displayed

; buffered game state for computing each line of output

.variable       line_prev               0*${N_MEM_WORDS+2}      ; values from previous line

.variable       line_curr               0*${N_MEM_WORDS+2}      ; values from current line

.variable       line_next               0*${N_MEM_WORDS+2}      ; values from next line

;

; Define ROM "nBitsSet".

;

.memory ROM nBitsSet

; Translate the values 0 through 7 inclusive into the number of ones in the value.

.variable       bit_counts              0 1 1 2 1 2 2 3