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-rw-r--r--trunk/src/emu/machine/pls100.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/pls100.c b/trunk/src/emu/machine/pls100.c
new file mode 100644
index 00000000000..2f3a0ba2d85
--- /dev/null
+++ b/trunk/src/emu/machine/pls100.c
@@ -0,0 +1,136 @@
+/**********************************************************************
+
+ PLS100 16x48x8 Programmable Logic Array emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************/
+
+#include "emu.h"
+#include "pls100.h"
+
+
+
+//**************************************************************************
+// DEVICE TYPE DEFINITION
+//**************************************************************************
+
+const device_type PLS100 = &device_creator<pls100_device>;
+
+
+
+//**************************************************************************
+// INLINE HELPERS
+//**************************************************************************
+
+//-------------------------------------------------
+// parse_fusemap -
+//-------------------------------------------------
+
+inline void pls100_device::parse_fusemap()
+{
+ jed_data jed;
+ jedbin_parse(machine().root_device().memregion(tag())->base(), machine().root_device().memregion(tag())->bytes(), &jed);
+ UINT32 fusenum = 0;
+ m_xor = 0;
+
+ for (int term = 0; term < PAL_TERMS; term++)
+ {
+ m_and_comp[term] = 0;
+ m_and_true[term] = 0;
+ m_or[term] = 0;
+
+ for (int i = 0; i < PAL_INPUTS; i++)
+ {
+ m_and_comp[term] |= jed_get_fuse(&jed, fusenum++) << i;
+ m_and_true[term] |= jed_get_fuse(&jed, fusenum++) << i;
+ }
+
+ for (int f = 0; f < PAL_OUTPUTS; f++)
+ {
+ m_or[term] |= !jed_get_fuse(&jed, fusenum++) << f;
+ }
+ }
+
+ for (int f = 0; f < PAL_OUTPUTS; f++)
+ {
+ m_xor |= jed_get_fuse(&jed, fusenum++) << f;
+ }
+}
+
+
+//-------------------------------------------------
+// get_product -
+//-------------------------------------------------
+
+inline int pls100_device::get_product(int term)
+{
+ UINT16 input_true = m_and_true[term] | m_i;
+ UINT16 input_comp = m_and_comp[term] | (m_i ^ 0xffff);
+
+ return (input_true & input_comp) == 0xffff;
+}
+
+
+//-------------------------------------------------
+// update_outputs -
+//-------------------------------------------------
+
+inline void pls100_device::update_outputs()
+{
+ m_s = 0;
+
+ for (int term = 0; term < PAL_TERMS; term++)
+ {
+ if (get_product(term))
+ {
+ m_s |= m_or[term];
+ }
+ }
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// pls100_device - constructor
+//-------------------------------------------------
+
+pls100_device::pls100_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, PLS100, "PLS100", tag, owner, clock)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void pls100_device::device_start()
+{
+ // parse fusemap
+ assert(machine().root_device().memregion(tag()) != NULL);
+ parse_fusemap();
+
+ // register for state saving
+ save_item(NAME(m_i));
+ save_item(NAME(m_s));
+}
+
+
+//-------------------------------------------------
+// read -
+//-------------------------------------------------
+
+UINT8 pls100_device::read(UINT16 input)
+{
+ m_i = input;
+
+ update_outputs();
+
+ return m_s ^ m_xor;
+}