diff options
author | 2016-06-29 08:34:30 +0200 | |
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committer | 2016-06-29 08:34:30 +0200 | |
commit | 63f9a01f8c5d43b9cfe68c2d401a84647d19c10e (patch) | |
tree | a1f1874aa84850bddbebd2b0e0bfc3e1c77ce8c4 /src/devices/bus/electron | |
parent | 1f6f1bfd6cfb748d9c5e159d6bd014bab8d30944 (diff) |
Cleanup and version bumpmame0175
Diffstat (limited to 'src/devices/bus/electron')
-rw-r--r-- | src/devices/bus/electron/exp.cpp | 2 | ||||
-rw-r--r-- | src/devices/bus/electron/exp.h | 146 |
2 files changed, 74 insertions, 74 deletions
diff --git a/src/devices/bus/electron/exp.cpp b/src/devices/bus/electron/exp.cpp index b13f6534002..ced8056d2eb 100644 --- a/src/devices/bus/electron/exp.cpp +++ b/src/devices/bus/electron/exp.cpp @@ -2,7 +2,7 @@ // copyright-holders:Nigel Barnes /********************************************************************** - Electron Expansion Port emulation + Electron Expansion Port emulation **********************************************************************/ diff --git a/src/devices/bus/electron/exp.h b/src/devices/bus/electron/exp.h index cfcb7478a10..2f59faec38a 100644 --- a/src/devices/bus/electron/exp.h +++ b/src/devices/bus/electron/exp.h @@ -2,84 +2,84 @@ // copyright-holders:Nigel Barnes /********************************************************************** - Electron Expansion Port emulation + Electron Expansion Port emulation ********************************************************************** - Pinout: - - 18V AC 2 1 18V AC - AC RETURN 4 3 AC RETURN - -5V 6 5 -5V - 0V 8 7 0V - +5V 10 9 +5V - 16MHz 12 11 SOUND O/P - PHI OUT 14 13 ÷13 IN - NMI 16 15 RST - R/W 18 17 IRQ - D6 20 19 D7 - D4 22 21 D5 - D2 24 23 D3 - D0 26 25 D1 - NC 28 27 RDY - SLOT 30 29 SLOT - A14 32 31 A15 - A12 34 33 A13 - A10 36 35 A11 - A0 38 37 A9 - A2 40 39 A1 - A4 42 41 A3 - A6 44 43 A5 - A8 46 45 A7 - 0V 48 47 0V - +5V 50 49 +5V - - Signal Definitions: - - 18V AC (pins 1,2) - These lines are connected directly to the output from the Electron mains power + Pinout: + + 18V AC 2 1 18V AC + AC RETURN 4 3 AC RETURN + -5V 6 5 -5V + 0V 8 7 0V + +5V 10 9 +5V + 16MHz 12 11 SOUND O/P + PHI OUT 14 13 13 IN + NMI 16 15 RST + R/W 18 17 IRQ + D6 20 19 D7 + D4 22 21 D5 + D2 24 23 D3 + D0 26 25 D1 + NC 28 27 RDY + SLOT 30 29 SLOT + A14 32 31 A15 + A12 34 33 A13 + A10 36 35 A11 + A0 38 37 A9 + A2 40 39 A1 + A4 42 41 A3 + A6 44 43 A5 + A8 46 45 A7 + 0V 48 47 0V + +5V 50 49 +5V + + Signal Definitions: + + 18V AC (pins 1,2) - These lines are connected directly to the output from the Electron mains power AC RETURNS (pins 3,4) - adaptor. A total of 6W may be drawn from these lines as long as no power is - taken from +5V (pins 9,10,49,50). For safety reasons these lines must never - be used as an AC input to the Electron. - -5V (pins 5,6) - A -5V supply from the Electron. Up to 20mA (total) may safely be drawn - from this line by expansion modules. - 0V (pins 7,8,47,48) - Ground. Expansion modules with their own power supply must have the 0V - lines commoned with the Electron. + taken from +5V (pins 9,10,49,50). For safety reasons these lines must never + be used as an AC input to the Electron. + -5V (pins 5,6) - A -5V supply from the Electron. Up to 20mA (total) may safely be drawn + from this line by expansion modules. + 0V (pins 7,8,47,48) - Ground. Expansion modules with their own power supply must have the 0V + lines commoned with the Electron. +5V (pins 9,10,49,50) - A +5V supply from the Electron. Up to 500mA (total) may safely be drawn - from this line by expansion modules as long as no power is taken from 18V - AC (pins 1,2,3,4). - SOUND O/P (pin 11) - Sound output. A 3V peak to peak source via a 1K series resistor from the - Electron ULA. - 16 MHz (pin 12) - 16 Megahertz from the Electron main oscillator. This output may be used - for clock generation within an expansion module. - /13 IN (pin 13) - 16 Megahertz divided by 13. This output may be used for baud rate - generation. If divided by 1024 it will give approximately 1200Hz. - PHI OUT (pin 14) - The 6502 input clock. The low time is nominally 250ns. The high time may - be 250ns (2MHz operation when reading ROMs) or 750ns or 1250ns - (stretched clock for a 1MHz access, the length depending on the phase of the - 2MHz clock) or up to 40us (if in modes 0-3) - RST (pin 15) - Reset (active low). This is an OUTPUT ONLY for the system reset line. It - may be used to initialise expansion modules on power up and when the - BREAK key is pressed. - NMI (pin 16) - Non-Maskable Interrupt (negative edge triggered). This is the system NMI - line which is open collector (wire-OR) and may be asserted by an expansion - module. The pull-up resistor on this line inside the ULA is 3k3. Care must - be taken to avoid masking other interrupts by holding the line low. Using - NMI on the Electron requires knowledge of operating system protocols. - IRQ (pin 17) - Interrupt Request (active low). This is the system IRQ line which is open - collector (wire-OR) and may be asserted by an expansion module. The pull- - up resistor on this line inside the ULA is 3k3. It is essential for the correct - operation of the machine that interrupts to not occur until the software is - capable of dealing with them. Interrupts on the Electron expansion bus should - therefore be disabled on power-up and reset. Significant use of interrupt - service time may affect other machine functions, eg the real time clock. - R/W (pin 18) - The system read/write line from the 6502. - D7-D0 (pins 19-26) - Bi-directional data bus. The direction of data is determined by R/W. - RDY (pin 27) - 6502 ready line (active low). May be asserted by an expansion module to - stop the processor when reading slow memory. This line works on read only - (R/W=1). - (pin 28) - No connection - (pins 29,30) - Polarising key connector. - A0-A15 (pins 31-46) - 6502 address bus. + from this line by expansion modules as long as no power is taken from 18V + AC (pins 1,2,3,4). + SOUND O/P (pin 11) - Sound output. A 3V peak to peak source via a 1K series resistor from the + Electron ULA. + 16 MHz (pin 12) - 16 Megahertz from the Electron main oscillator. This output may be used + for clock generation within an expansion module. + /13 IN (pin 13) - 16 Megahertz divided by 13. This output may be used for baud rate + generation. If divided by 1024 it will give approximately 1200Hz. + PHI OUT (pin 14) - The 6502 input clock. The low time is nominally 250ns. The high time may + be 250ns (2MHz operation when reading ROMs) or 750ns or 1250ns + (stretched clock for a 1MHz access, the length depending on the phase of the + 2MHz clock) or up to 40us (if in modes 0-3) + RST (pin 15) - Reset (active low). This is an OUTPUT ONLY for the system reset line. It + may be used to initialise expansion modules on power up and when the + BREAK key is pressed. + NMI (pin 16) - Non-Maskable Interrupt (negative edge triggered). This is the system NMI + line which is open collector (wire-OR) and may be asserted by an expansion + module. The pull-up resistor on this line inside the ULA is 3k3. Care must + be taken to avoid masking other interrupts by holding the line low. Using + NMI on the Electron requires knowledge of operating system protocols. + IRQ (pin 17) - Interrupt Request (active low). This is the system IRQ line which is open + collector (wire-OR) and may be asserted by an expansion module. The pull- + up resistor on this line inside the ULA is 3k3. It is essential for the correct + operation of the machine that interrupts to not occur until the software is + capable of dealing with them. Interrupts on the Electron expansion bus should + therefore be disabled on power-up and reset. Significant use of interrupt + service time may affect other machine functions, eg the real time clock. + R/W (pin 18) - The system read/write line from the 6502. + D7-D0 (pins 19-26) - Bi-directional data bus. The direction of data is determined by R/W. + RDY (pin 27) - 6502 ready line (active low). May be asserted by an expansion module to + stop the processor when reading slow memory. This line works on read only + (R/W=1). + (pin 28) - No connection + (pins 29,30) - Polarising key connector. + A0-A15 (pins 31-46) - 6502 address bus. **********************************************************************/ |