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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Texas Instruments SN74S262N Row Output Character Generator emulation
**********************************************************************/
#include "emu.h"
#include "sn74s262.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(SN74S262, sn74s262_device, "sn74s262", "SN74S262N Row Output Character Generator")
DEFINE_DEVICE_TYPE(SN74S263, sn74s263_device, "sn74s263", "SN74S263N Row Output Character Generator")
//-------------------------------------------------
// gfx_layout charlayout
//-------------------------------------------------
const gfx_layout sn74s262_device::charlayout =
{
6, 10,
128,
1,
{ 0 },
{ 0, 1, 2, 3, 4, 5 },
{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8 },
10*8
};
//-------------------------------------------------
// GFXDECODE( sn74s262 )
//-------------------------------------------------
GFXDECODE_MEMBER( sn74s262_device::gfxinfo )
GFXDECODE_DEVICE("chargen", 0, charlayout, 0, 1 ) // normal characters
GFXDECODE_DEVICE("chargen", 0x500, charlayout, 0, 1 ) // graphics characters
GFXDECODE_END
//-------------------------------------------------
// ROM( sn74s262 )
//-------------------------------------------------
ROM_START( sn74s262 )
ROM_REGION( 0xa00, "chargen", 0 )
ROM_LOAD( "sn74s262", 0x000, 0x500, BAD_DUMP CRC(6896d319) SHA1(1234558418a5c7a9823d54a93d0c7f63bd8a490a) ) // created by hand
ROM_END
//-------------------------------------------------
// ROM( sn74s263 )
//-------------------------------------------------
ROM_START( sn74s263 )
ROM_REGION( 0xa00, "chargen", 0 )
ROM_LOAD( "sn74s263", 0x000, 0xa00, BAD_DUMP CRC(9e064e91) SHA1(354783c8f2865f73dc55918c9810c66f3aca751f) ) // created by hand
ROM_END
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
const tiny_rom_entry *sn74s262_device::device_rom_region() const
{
return ROM_NAME( sn74s262 );
}
const tiny_rom_entry *sn74s263_device::device_rom_region() const
{
return ROM_NAME( sn74s263 );
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void sn74s262_device::device_start()
{
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// sn74s262_device - constructor
//-------------------------------------------------
sn74s262_device::sn74s262_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, type, tag, owner, clock),
device_gfx_interface(mconfig, *this, gfxinfo),
m_char_rom(*this, "chargen")
{
}
sn74s262_device::sn74s262_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
sn74s262_device(mconfig, SN74S262, tag, owner, clock)
{
}
sn74s263_device::sn74s263_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
sn74s262_device(mconfig, SN74S263, tag, owner, clock)
{
}
//-------------------------------------------------
// read -
//-------------------------------------------------
u8 sn74s262_device::read(u8 character, u8 row)
{
if ((row & 0xf) > 8)
{
return 0;
}
return m_char_rom[((character & 0x7f) * 10) + (row & 0xf)];
}
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