From dfb6dfb828b927ebe511ef9b068b16208bd12b44 Mon Sep 17 00:00:00 2001
From: Octocontrabass <joe.derpa@gmail.com>
Date: Sat, 19 Oct 2024 13:08:55 -0700
Subject: Add Linksys PAP2 again (#12854)

New machines marked as NOT_WORKING
----------------------------------
Linksys PAP2 [unknown]
---
 src/mame/mame.lst          |   3 ++
 src/mame/skeleton/pap2.cpp | 103 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+)
 create mode 100644 src/mame/skeleton/pap2.cpp

diff --git a/src/mame/mame.lst b/src/mame/mame.lst
index 33326326a5c..7e8318bead9 100644
--- a/src/mame/mame.lst
+++ b/src/mame/mame.lst
@@ -42500,6 +42500,9 @@ p8000_16                        //
 @source:skeleton/palestra.cpp
 palestra
 
+@source:skeleton/pap2.cpp
+pap2
+
 @source:skeleton/pcksurfer.cpp
 pcksurfer                       // (c) 2006 Datawind
 
diff --git a/src/mame/skeleton/pap2.cpp b/src/mame/skeleton/pap2.cpp
new file mode 100644
index 00000000000..8d5b2a4513b
--- /dev/null
+++ b/src/mame/skeleton/pap2.cpp
@@ -0,0 +1,103 @@
+// license:BSD-3-Clause
+// copyright-holders:Joseph Khilfeh
+
+/*
+
+Linksys PAP2 two-port analog telephone adapter
+
+ESS Visba 3 ES3890F @ 27MHz (CPU/MCU)
+Realtek RTL8019AS (NIC)
+ICSI IC41LV16100S-50KG (2MB RAM)
+SST39VF080-70-4C-EI (1MB flash ROM)
+2x Silicon Labs Si3210-KT (line interfaces)
+
+Four of the five LEDs are controlled by ES3890F GPIOs
+Power LEDs are connected to AUX1[4] and AUX1[5] (pin 112 and 113)
+Phone 1 LED is connected to AUX1[6] (pin 114)
+Phone 2 LED is connected to AUX1[7] (pin 115)
+Ethernet LED is connected to RTL8019AS somehow
+
+RTL8019AS pin 65 is tied to VDD to disable PnP
+RTL8019AS pin 96 is tied to ground to share the flash ROM's 8-bit data bus
+RTL8019AS registers are selected when ES3890F pin 19 (/CS1) is low
+It looks like the RTL8019AS EEPROM pins are connected to ES3890F AUX2[0-3]?
+
+
+There are several ATAs based on essentially the same hardware:
+
+Sipura SPA-2000
+Sipura SPA-1000
+Sipura SPA-3000 (ES3890F, RTL8019AS, 2MB RAM, 1MB flash, unknown line interfaces)
+Sipura SPA-1001 (ES3890F, RTL8019AS, 2MB RAM, 1MB flash, 1x Si3210)
+Sipura SPA-2100 (Sipura SIP316F @ 27MHz, 2x RTL8019AS, 8MB RAM, 2MB flash, unknown line interfaces)
+Sipura SPA-2002
+Linksys PAP2T (ES3890F, RTL8019AS, 2MB RAM, 1MB flash, 2x Si3215)
+Linksys SPA2102?
+
+There are also ATAs with similar names but probably very different hardware:
+
+Linksys PAP2 V2
+Cisco SPA112
+Cisco SPA122
+
+*/
+
+#include "emu.h"
+
+#include "cpu/mipsx/mipsx.h"
+
+
+namespace {
+
+class pap2_state : public driver_device
+
+{
+public:
+	pap2_state(machine_config const &mconfig, device_type type, char const *tag) :
+		driver_device(mconfig, type, tag),
+		m_maincpu(*this, "maincpu")
+	{
+	}
+
+	void pap2(machine_config &config) ATTR_COLD;
+
+protected:
+	virtual void machine_reset() override ATTR_COLD;
+
+private:
+	required_device<mipsx_cpu_device> m_maincpu;
+
+	void mem(address_map &map) ATTR_COLD;
+};
+
+
+void pap2_state::machine_reset()
+{
+	m_maincpu->set_state_int(STATE_GENPC, 0x1cffff80); // might actually be 0x7fffff80 with a ROM mirror
+}
+
+void pap2_state::mem(address_map &map)
+{
+	map(0x00000000, 0x001fffff).ram();
+	map(0x1c000000, 0x1c0fffff).mirror(0x00f00000).rom().region("maincpu", 0);
+	// ES3890F registers at 0x20000000-0x2000ffff, ES6008 datasheet could be helpful
+}
+
+void pap2_state::pap2(machine_config &config)
+{
+	MIPSX(config, m_maincpu, 27_MHz_XTAL * 3); // guessing 3x from ES3880 datasheet
+	m_maincpu->set_addrmap(AS_PROGRAM, &pap2_state::mem);
+}
+
+INPUT_PORTS_START(pap2)
+INPUT_PORTS_END
+
+ROM_START(pap2)
+	ROM_REGION32_BE(0x100000, "maincpu", 0 )
+	ROM_LOAD("linksys-pap2-2.0.12-ls.u51", 0x000000, 0x100000, BAD_DUMP CRC(4d0f1e5d) SHA1(73b163b00a3709a14f7419283c8515dd91009598) )
+	// Original ROM label is unknown, if it had one. S/N FH900DC35989, MAC 00:12:17:FB:70:DC
+ROM_END
+
+}
+
+SYST( 200?, pap2, 0, 0, pap2, pap2, pap2_state, empty_init, "Linksys (Cisco)", "PAP2", MACHINE_IS_SKELETON )
-- 
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