RMX1.0 Memory Watch

local cumsum = 0
local prev_counter = 0
local tic = 0
local flag_color = "yellow"
local counter_color = "yellow"
while true do
    pad=joypad.get(1);
    --print(pad)
    counter = mainmemory.read_s8(0x001F9D)
    flag = mainmemory.read_s8(0x001F9B)
    if pad.X then
        prev_counter = counter
        tic = counter
        cumsum = 0
    end
    if prev_counter > counter then
        cumsum = cumsum + 256
    end
    for i = 3, 16, 1 do
        gui.drawText(18*(i-3),  0, string.format("%02X", 0x90+i),"white", null, 12, "Courier New")
        gui.drawText(18*(i-3), 12, string.format("%02X", mainmemory.read_u8(0x001F90+i)), "yellow", null, 12, "Courier New")
    end

    gui.drawText(0, 24, "Count: ", counter_color, null, 12, "Courier New")
    if counter < 0 then
        counter_color = "red"
    else
        counter_color = "yellow"
    end
    gui.drawText(45, 24, counter, counter_color, null, 12, "Courier New")

    gui.drawText(0, 36, "Flag: ", flag_color, null, 12, "Courier New")
    if flag == 0 then
        flag_color = "red"
    else
        flag_color = "yellow"
    end
    gui.drawText(45, 36, flag, flag_color, null, 12, "Courier New")
    gui.drawText(0, 48, "Last: " .. cumsum + counter - tic, "white", null, 12, "Courier New")

    prev_counter = counter
    emu.frameadvance()
end