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bus/bbc/rom: Added support for the Acornsoft Trilogy Emulator board.

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This commit is contained in:
Nigel Barnes 2022-12-11 20:12:15 +00:00
parent 9d6567ba44
commit d363f6336a
3 changed files with 43 additions and 0 deletions
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26
src/devices/bus/bbc/rom/pal.cpp
View File

@ -34,6 +34,12 @@
Not a PALPROM carrier board but a larger ROM carrier containing 4x32K
and TTL circuits to enable and page each ROM into 16K banks.
Acornsoft Trilogy Emulator (PAL20R4)
An unreleased product that combines the View family of ROMs into a
single banked 64K ROM, using a PAL to perform 16K bank switches upon
reads from the last 4 bytes of ROM space &BFFC to &BFFF. Only known
example loaned by Stuart Swales.
***************************************************************************/
#include "emu.h"
@ -53,6 +59,7 @@ DEFINE_DEVICE_TYPE(BBC_PALTED, bbc_palted_device, "bbc_palted", "Watford Electro
DEFINE_DEVICE_TYPE(BBC_PALABEP, bbc_palabep_device, "bbc_palabep", "P.R.E.S. 32K ROM Carrier (ABE+)")
DEFINE_DEVICE_TYPE(BBC_PALABE, bbc_palabe_device, "bbc_palabe", "P.R.E.S. 32K ROM Carrier (ABE)")
DEFINE_DEVICE_TYPE(BBC_PALMO2, bbc_palmo2_device, "bbc_palmo2", "Instant Mini Office 2 ROM Carrier")
DEFINE_DEVICE_TYPE(BBC_TRILOGY, bbc_trilogy_device, "bbc_trilogy", "Acornsoft Trilogy Emulator")
//**************************************************************************
@ -115,6 +122,11 @@ bbc_palmo2_device::bbc_palmo2_device(const machine_config &mconfig, const char *
{
}
bbc_trilogy_device::bbc_trilogy_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: bbc_pal_device(mconfig, BBC_TRILOGY, tag, owner, clock)
{
}
//-------------------------------------------------
// device_start - device-specific startup
@ -310,3 +322,17 @@ uint8_t bbc_palmo2_device::read(offs_t offset)
return get_rom_base()[(offset & 0x3fff) | (m_bank << 13)];
}
uint8_t bbc_trilogy_device::read(offs_t offset)
{
if (!machine().side_effects_disabled())
{
/* switching zones for Acornsoft Trilogy Emulator */
switch (offset & 0x3ff8)
{
case 0x3ff8: m_bank = offset & 0x03; break;
}
}
return get_rom_base()[(offset & 0x3fff) | (m_bank << 14)];
}

14
src/devices/bus/bbc/rom/pal.h
View File

@ -151,6 +151,19 @@ protected:
virtual uint8_t read(offs_t offset) override;
};
// ======================> bbc_trilogy_device
class bbc_trilogy_device : public bbc_pal_device
{
public:
// construction/destruction
bbc_trilogy_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
// device_bbc_rom_interface overrides
virtual uint8_t read(offs_t offset) override;
};
// device type definition
DECLARE_DEVICE_TYPE(BBC_CCIWORD, bbc_cciword_device)
@ -162,6 +175,7 @@ DECLARE_DEVICE_TYPE(BBC_PALTED, bbc_palted_device)
DECLARE_DEVICE_TYPE(BBC_PALABEP, bbc_palabep_device)
DECLARE_DEVICE_TYPE(BBC_PALABE, bbc_palabe_device)
DECLARE_DEVICE_TYPE(BBC_PALMO2, bbc_palmo2_device)
DECLARE_DEVICE_TYPE(BBC_TRILOGY, bbc_trilogy_device)
#endif // MAME_BUS_BBC_ROM_PAL_H

3
src/devices/bus/bbc/rom/slot.cpp
View File

@ -213,6 +213,7 @@ void bbc_romslot_device::write(offs_t offset, uint8_t data)
#include "datagem.h"
#include "dfs.h"
#include "genie.h"
//#include "gommc.h"
#include "pal.h"
//#include "ramagic.h"
#include "rtc.h"
@ -234,8 +235,10 @@ void bbc_rom_devices(device_slot_interface &device)
device.option_add_internal("palmo2", BBC_PALMO2);
device.option_add_internal("datagem", BBC_DATAGEM);
device.option_add_internal("genie", BBC_PMSGENIE);
//device.option_add_internal("gommc", BBC_GOMMC);
device.option_add_internal("dfse00", BBC_DFSE00);
//device.option_add_internal("ramagic", BBC_RAMAGIC);
device.option_add_internal("stlrtc", BBC_STLRTC);
device.option_add_internal("pmsrtc", BBC_PMSRTC);
device.option_add_internal("trilogy", BBC_TRILOGY);
}