26 lines
1.1 KiB
Diff
26 lines
1.1 KiB
Diff
--- a/src/devices/machine/z80scc.cpp
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+++ b/src/devices/machine/z80scc.cpp
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@@ -1045,7 +1045,7 @@
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m_uart->m_wr0_ptrbits = 0;
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- m_rx_fifo_sz = (m_uart->m_variant & z80scc_device::SET_ESCC) ? 8 : 3;
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+ m_rx_fifo_sz = 512; // RetroNet patch: see z80scc.h - emulation-side depth for polled receivers
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m_tx_fifo_sz = (m_uart->m_variant & z80scc_device::SET_ESCC) ? 4 : 1;
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--- a/src/devices/machine/z80scc.h
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+++ b/src/devices/machine/z80scc.h
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@@ -256,8 +256,10 @@
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unsigned int m_delayed_tx_brg_change;
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// receiver state
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- uint8_t m_rx_data_fifo[8]; // receive data FIFO
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- uint8_t m_rx_error_fifo[8]; // receive error FIFO
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+ // RetroNet patch: widened from 8 so a POLLED receiver (no RX interrupt) survives its deaf
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+ // windows under emulation; real silicon depth is 3/8 and real clients need interrupt RX.
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+ uint8_t m_rx_data_fifo[512]; // receive data FIFO
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+ uint8_t m_rx_error_fifo[512]; // receive error FIFO
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uint8_t m_rx_error; // current receive error
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//int m_rx_fifo // receive FIFO pointer
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int m_rx_fifo_rp; // receive FIFO read pointer
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