From 58e7ffe252df2eded79050eae636c799bd9157ef Mon Sep 17 00:00:00 2001 From: AJR Date: Sun, 5 Nov 2017 15:55:25 -0500 Subject: cd2650: Miscellaneous notes and corrections (nw) --- src/mame/drivers/cd2650.cpp | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/src/mame/drivers/cd2650.cpp b/src/mame/drivers/cd2650.cpp index 7755e7a0db8..95ffe911d2c 100644 --- a/src/mame/drivers/cd2650.cpp +++ b/src/mame/drivers/cd2650.cpp @@ -10,6 +10,8 @@ No info available on this computer apart from a few newsletters and magazine articles. The computer was described in a series of articles published between April and June 1977 in Radio-Electronics, which include supposedly complete schematics and fairly detailed subsystem descriptions. +There is supposed to be a “Computer System Manual” with definitive revised +schematics, but this has not been found yet. All signals to and from the 2650 board (including the built-in 300 baud Kansas City standard cassette tape interface) are passed through six ribbon @@ -90,6 +92,8 @@ private: WRITE_LINE_MEMBER(cd2650_state::tape_deck_on_w) { + // output polarity not verified + logerror("Cassette tape deck turned %s\n", state ? "on" : "off"); } WRITE_LINE_MEMBER(cd2650_state::cass_w) @@ -285,8 +289,11 @@ static MACHINE_CONFIG_START( cd2650 ) MCFG_DEVICE_ADD("outlatch", F9334, 0) // IC26 MCFG_ADDRESSABLE_LATCH_Q0_OUT_CB(WRITELINE(cd2650_state, tape_deck_on_w)) // TD ON - MCFG_ADDRESSABLE_LATCH_Q1_OUT_CB(DEVWRITELINE("beeper", beep_device, set_state)) // which is this? + MCFG_ADDRESSABLE_LATCH_Q7_OUT_CB(DEVWRITELINE("beeper", beep_device, set_state)) // OUT6 // Q1-Q7 = OUT 0-6, not defined in RE + // The connection of OUT6 to a 700-1200 Hz noise generator is suggested + // in Central Data 2650 Newsletter, Volume 1, Issue 3 for use with the + // "Morse Code" program by Mike Durham. /* video hardware */ MCFG_SCREEN_ADD("screen", RASTER) -- cgit v1.2.3