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Diffstat (limited to 'src/mame/drivers/cd2650.cpp')
-rw-r--r--src/mame/drivers/cd2650.cpp9
1 files changed, 8 insertions, 1 deletions
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)