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Code Issues Releases Wiki Activity

C64: [C1541] Unconnected VIA ports are 1

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This commit is contained in:
Gyorgy Szombathelyi
2020-04-13 21:13:10 +02:00
parent 81b0dac3d0
commit 82dfa12c09
1 changed files with 12 additions and 11 deletions
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23
cores/c64/rtl/c1541/c1541_logic.vhd
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@@ -170,14 +170,15 @@ begin
uc1_ca1_i <= not sb_atn_in;
-- PA
uc1_pa_i(0) <= tr00_sense_n;
uc1_pa_i(7 downto 1) <= (others => '0'); -- NC
uc1_pa_i(7 downto 1) <= (others => '1'); -- NC
-- PB
uc1_pb_i(0) <= not (sb_data_in and sb_data_oe);
sb_data_oe <= not (uc1_pb_o(1) or uc1_pb_oe_n(1)) and not atn;
uc1_pb_i(1) <= '1';
sb_data_oe <= not (uc1_pb_o(1) or uc1_pb_oe_n(1)) and not atn;
uc1_pb_i(2) <= not (sb_clk_in and sb_clk_oe);
sb_clk_oe <= not (uc1_pb_o(3) or uc1_pb_oe_n(3));
sb_clk_oe <= not (uc1_pb_o(3) or uc1_pb_oe_n(3));
uc1_pb_i(4 downto 3) <= "11"; -- NC
atna <= uc1_pb_o(4) or uc1_pb_oe_n(4);
uc1_pb_i(6 downto 5) <= DEVICE_SELECT xor ds; -- allows override
uc1_pb_i(7) <= not sb_atn_in;
@@ -314,10 +315,10 @@ begin
port_b_i => uc1_pb_i,
ca1_i => uc1_ca1_i,
ca2_i => '0',
ca2_i => '1',
cb1_i => '0',
cb2_i => '0',
cb1_i => '1',
cb2_i => '1',
irq => uc1_irq
);
@@ -353,13 +354,13 @@ begin
ca1_i => uc3_ca1_i,
ca2_o => uc3_ca2_o,
ca2_i => '0',
ca2_i => '1',
ca2_t => uc3_ca2_oe,
cb1_i => '0',
cb1_i => '1',
cb2_o => uc3_cb2_o,
cb2_i => '0',
cb2_i => '1',
cb2_t => uc3_cb2_oe,
irq => uc3_irq