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bbc_autocue: Corrected RAM page register.

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This commit is contained in:
Nigel Barnes 2020-08-24 21:28:49 +01:00
parent d44d242c69
commit acfb16f189
1 changed files with 7 additions and 5 deletions
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12
src/devices/bus/bbc/exp/autocue.cpp
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@ -61,6 +61,10 @@ void bbc_autocue_device::device_start()
/* ram disk - board with 8 x HM62256LFP-12 - 256K expandable to 512K */
m_ram = make_unique_clear<uint8_t[]>(0x40000);
m_nvram->set_base(m_ram.get(), 0x40000);
/* register for save states */
save_item(NAME(m_ram_page));
save_pointer(NAME(m_ram), 0x40000);
}
@ -72,10 +76,9 @@ void bbc_autocue_device::fred_w(offs_t offset, uint8_t data)
{
switch (offset)
{
case 0xff: m_ram_page = (m_ram_page & 0x00ff) | (data << 8); break;
case 0xfe: m_ram_page = (m_ram_page & 0xff00) | (data << 0); break;
case 0xfe: m_ram_page = (m_ram_page & 0x00ff) | (data << 8); break;
case 0xff: m_ram_page = (m_ram_page & 0xff00) | (data << 0); break;
}
//logerror("Write ram_page=%04x\n", m_ram_page);
}
uint8_t bbc_autocue_device::jim_r(offs_t offset)
@ -86,13 +89,12 @@ uint8_t bbc_autocue_device::jim_r(offs_t offset)
{
data = m_ram[(m_ram_page << 8) | offset];
}
//logerror("Read %04x -> %02x\n", offset | 0xfd00, data);
return data;
}
void bbc_autocue_device::jim_w(offs_t offset, uint8_t data)
{
//logerror("Write %04x <- %02x\n", offset | 0xfd00, data);
if (m_ram_page < 0x400)
{
m_ram[(m_ram_page << 8) | offset] = data;