spg format + [tsconf_betadisc_flop.xml] updated games/demos [holub, tslabs]

src/mame/sinclair/spec128.cpp

@@ -238,6 +238,13 @@ void spectrum_128_state::spectrum_128_port_7ffd_w(offs_t offset, uint8_t data)
 	m_exp->iorq_w(offset | 1, data);
 }
 
+void spectrum_128_state::bank3_set_page(u8 page)
+{
+	m_port_7ffd_data &= 0xf8;
+	m_port_7ffd_data |= page & 0x07;
+	spectrum_128_update_memory();
+}
+
 void spectrum_128_state::spectrum_128_update_memory()
 {
 	m_bank_rom[0]->set_entry(BIT(m_port_7ffd_data, 4));

src/mame/sinclair/spec128.h

@@ -33,6 +33,7 @@ class spectrum_128_state : public spectrum_state
 	virtual void machine_start() override;
 	virtual void machine_reset() override;
 
+	virtual void bank3_set_page(u8 page) override;
 	virtual void spectrum_128_update_memory() override;
 	virtual rectangle get_screen_area() override;