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-rw-r--r--src/devices/machine/spchrom.cpp139
1 files changed, 0 insertions, 139 deletions
diff --git a/src/devices/machine/spchrom.cpp b/src/devices/machine/spchrom.cpp
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index 3cd95b87c2e..00000000000
--- a/src/devices/machine/spchrom.cpp
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-// license:BSD-3-Clause
-// copyright-holders:Frank Palazzolo, Aaron Giles, Jonathan Gevaryahu, Raphael Nabet, Couriersud, Michael Zapf
-/*
- spchroms.c - This is an emulator for "typical" speech ROMs from TI, as used by TI99/4(a).
-
- In order to support its speech processor, TI designed some ROMs with a 1-bit data bus
- and 4-bit address bus (multiplexed 5 times to provide a 18-bit address).
- A fairly complete description of such a ROM (tms6100) is found in the tms5220 datasheet.
-
- One notable thing is that the address is a byte address (*NOT* a bit address).
-
- This file is designed to be interfaced with the tms5220 core.
- Interfacing it with the tms5110 would make sense, too.
-
- TODO:
- Create separate devices for TMS6100 & TMS6125
- Implement the serial protocol
-*/
-
-#include "emu.h"
-#include "spchrom.h"
-
-#define TMS5220_ADDRESS_MASK 0x3FFFFUL /* 18-bit mask for tms5220 address */
-
-// device type definition
-DEFINE_DEVICE_TYPE(SPEECHROM, speechrom_device, "speechrom", "TI Speech ROM")
-
-speechrom_device::speechrom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
- : device_t(mconfig, SPEECHROM, tag, owner, clock), m_speechrom_data(nullptr), m_speechROMlen(0),
- m_speechROMaddr(0),
- m_load_pointer(0),
- m_ROM_bits_count(0),
- m_reverse(false)
-{
-}
-
-/*
- Read 'count' bits serially from speech ROM
-
- Actually, the ROM is expected to have reversed bit order, but there are
- many dumps with normal bit order.
-
- compatibility mode: 01234567 01234567 01234567 ...
- correct mode: 76543210 76543210 76543210 ...
-*/
-int speechrom_device::read(int count)
-{
- int val;
- int spchbyte;
- int pos;
-
- if (m_load_pointer)
- { /* first read after load address is ignored */
- m_load_pointer = 0;
- count--;
- }
-
- if (m_speechROMaddr < m_speechROMlen)
- {
- val = 0;
- pos = 8 - m_ROM_bits_count;
-
- spchbyte = (m_reverse? (m_speechrom_data[m_speechROMaddr] >> pos) : (m_speechrom_data[m_speechROMaddr] << pos)) & 0xff;
-
- while (count > 0)
- {
- val = val << 1;
- if ((spchbyte & (m_reverse? 0x01:0x80))!=0) val |= 1;
- spchbyte = m_reverse? (spchbyte >> 1) : (spchbyte << 1);
- count--;
- if (pos == 7)
- {
- pos = 0;
- m_speechROMaddr = (m_speechROMaddr + 1) & TMS5220_ADDRESS_MASK;
- if (m_speechROMaddr >= m_speechROMlen)
- count = 0;
- else
- spchbyte = m_speechrom_data[m_speechROMaddr];
- }
- else pos++;
- }
- m_ROM_bits_count = 8 - pos;
- }
- else
- {
- val = 0;
- }
-
- return val;
-}
-
-/*
- Write an address nibble to speech ROM
-*/
-void speechrom_device::load_address(int data)
-{
- /* tms5220 data sheet says that if we load only one 4-bit nibble, it won't work.
- This code does not care about this. */
- m_speechROMaddr = ( (m_speechROMaddr & ~(0xf << m_load_pointer))
- | (((unsigned long) (data & 0xf)) << m_load_pointer) ) & TMS5220_ADDRESS_MASK;
- m_load_pointer += 4;
- m_ROM_bits_count = 8;
-}
-
-/*
- Perform a read and branch command
-*/
-void speechrom_device::read_and_branch()
-{
- /* tms5220 data sheet says that if more than one speech ROM (tms6100) is present,
- there is a bus contention. This code does not care about this. */
- if (m_speechROMaddr < m_speechROMlen-1)
- m_speechROMaddr = (m_speechROMaddr & 0x3c000UL)
- | (((((unsigned long) m_speechrom_data[m_speechROMaddr]) << 8)
- | m_speechrom_data[m_speechROMaddr+1]) & 0x3fffUL);
- else if (m_speechROMaddr == m_speechROMlen-1)
- m_speechROMaddr = (m_speechROMaddr & 0x3c000UL)
- | ((((unsigned long) m_speechrom_data[m_speechROMaddr]) << 8) & 0x3fffUL);
- else
- m_speechROMaddr = (m_speechROMaddr & 0x3c000UL);
-
- m_ROM_bits_count = 8;
-}
-
-void speechrom_device::device_start()
-{
- memory_region *region = memregion(tag());
- if (region == nullptr)
- {
- throw emu_fatalerror("No region for device '%s'\n", tag());
- }
-
- m_speechrom_data = region->base();
- m_speechROMlen = region->bytes();
-
- save_item(NAME(m_speechROMaddr));
- save_item(NAME(m_load_pointer));
- save_item(NAME(m_ROM_bits_count));
-}