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ti99: Fixed RS232 line mapping

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This commit is contained in:
Michael Zapf 2016-08-04 13:43:13 +02:00
parent 3c47e78419
commit 267701595b
1 changed files with 36 additions and 34 deletions
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70
src/devices/bus/ti99_peb/ti_rs232.cpp
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@ -483,42 +483,45 @@ void ti_rs232_pio_device::transmit_data(int uartind, UINT8 value)
}
/*
Map the DCE-like wiring to a DTE-like wiring (and vice versa), V1
Map the DCE-like wiring to a DTE-like wiring and vice versa (mapping==0)
No handshake
Emulated PC serial
TI RS232 interface
XOUT 2 -----------( 3) ---> TXD
RIN 3 -----------( 2) <--- RXD
nc 4 -----------( 5) <--- CTS (cable)
CRU 5 -| |-( 8) <--- DCD
DSR+CTS 20 -----------( 6) <--- DSR
+12V 6 -----------(20) ---> DTR
RTS 8 -----------( 4) ---> RTS
Emulated PC serial
TI RS232 interface
XOUT 2 TXD ----->-----( 3) ---> TXD
RIN 3 RXD -----<-----( 2) <--- RXD
CRU 5 CTS -| |-( 8) <--- DCD (cable)
+12V 6 DSR ----->-----(20) ---> DTR
RTS 8 DCD ----->-----( 4) ---> RTS
DSR+CTS 20 DTR -----<-----( 6) <--- DSR
|-( 5) <--- CTS
Alternative mapping: (mapping==1)
RTS/CTS handshake
Alternative mapping for the PORT terminal emulator: (V2)
Emulated PC serial
TI RS232 interface
XOUT 2 TXD ----->-----( 3) ---> TXD
RIN 3 RXD -----<-----( 2) <--- RXD
CRU 5 CTS ----->-----( 4) ---> RTS
+12V 6 DSR -| |-( 6) <--- DSR
RTS 8 DCD ----->-----(20) ---> DTR
DSR+CTS 20 DTR -----<-----( 8) <--- DCD
|-( 5) <--- CTS
Emulated PC serial
TI RS232 interface
XOUT 2 -----------( 3) ---> TXD
RIN 3 -----------( 2) <--- RXD
DSR+CTS 20 -----------( 5) <--- CTS (cable)
RTS 8 -----------(20) ---> DTR
CRU 5 -----------( 4) ---> RTS
+12V 6 -| |-( 6) <--- DSR
nc 4 -----------( 8) <--- DCD
Yet another mapping: (mapping==2)
CRU-based handshake
Yet another mapping for the PORT terminal emulator: (V3)
Emulated PC serial
TI RS232 interface
XOUT 2 TXD ----->-----( 3) ---> TXD
RIN 3 RXD -----<-----( 2) <--- RXD
CRU 5 CTS ----->-----(20) ---> DTR
+12V 6 DSR -| |-( 6) <--- DSR
RTS 8 DCD ----->-----( 4) ---> RTS
DSR+CTS 20 DTR -----<-----( 5) <--- CTS (cable)
|-( 8) <--- DCD
Emulated PC serial
TI RS232 interface
XOUT 2 -----------( 3) ---> TXD
RIN 3 -----------( 2) <--- RXD
DSR+CTS 20 -----------( 5) <--- CTS (cable)
CRU 5 -----------(20) ---> DTR
RTS 8 -----------( 4) ---> RTS
+12V 6 -| |-( 6) <--- DSR
nc 4 -----------( 8) <--- DCD
*/
UINT8 ti_rs232_pio_device::map_lines_out(int uartind, UINT8 value)
{
@ -628,8 +631,7 @@ UINT8 ti_rs232_pio_device::map_lines_in(int uartind, UINT8 value)
{
if (mapping==1)
{
// V2 (PORT application)
if (value & CTS)
if (value & DCD)
{
ret |= DTR;
if (TRACE_MAP) logerror("(RS232/%d) Setting DTR line\n", uartind+1);
@ -638,9 +640,9 @@ UINT8 ti_rs232_pio_device::map_lines_in(int uartind, UINT8 value)
{
if (TRACE_MAP) logerror("(RS232/%d) Cannot map DSR line, ignoring\n", uartind+1);
}
if (value & DCD)
if (value & CTS)
{
if (TRACE_MAP) logerror("(RS232/%d) Cannot map DCD line, ignoring\n", uartind+1);
if (TRACE_MAP) logerror("(RS232/%d) Cannot map CTS line, ignoring\n", uartind+1);
}
}
else