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Use improved IO to clean up dispi port weirdness

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copy 2013-11-25 20:02:55 +01:00
parent 81fe7ad9ca
commit e91cffe136
1 changed files with 9 additions and 16 deletions
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25
src/vga.js
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@ -920,32 +920,25 @@ function VGAScreen(dev, adapter)
// Bochs VBE Extensions
// http://wiki.osdev.org/Bochs_VBE_Extensions
var dispi_index = -1,
dispi_value = -1,
read_index = true;
dispi_value = -1;
function port1CE_write(value)
{
dispi_index = value;
read_index = true;
}
io.register_write(0x1CE, port1CE_write);
function port1CF_write(value)
function port1CF_write(value, low_port)
{
if(read_index)
if(low_port === 0x1CE)
{
dispi_index |= value << 8;
read_index = false
return;
dispi_index = dispi_index & 0xFF | value << 8;
}
read_index = true;
dispi_value = value;
switch(dispi_index)
else
{
default:
dbg_log("1CF / dispi write low " + h(dispi_index) + ": " + h(value), LOG_VGA);
dispi_value = value;
dbg_log("1CF / dispi write low " + h(dispi_index) + ": " + h(value), LOG_VGA);
}
}
io.register_write(0x1CF, port1CF_write);
@ -953,7 +946,7 @@ function VGAScreen(dev, adapter)
function port1D0_write(value)
{
dbg_log("1D0 / dispi write high " + h(dispi_index) + ": " + h(value), LOG_VGA);
dispi_value |= value << 8;
dispi_value = dispi_value & 0xFF | value << 8;
switch(dispi_index)
{