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Herbymon (herby monitor?) MSX machine language monitor

by RvS on 31-05-2020, 14:27
Score: 176.31 %, Type: Forum topic , Comments: 4 comments
In the late '80s I started learning machine learning with this book: Machinetaal voor MSX computers that I bought at the V&D :D On the MSX I never used an assembler, but always used the monitor that was included in the book: Herbymon. ...

MSX Z80 clock frequency

by RvS on 29-05-2020, 10:28
Score: 175.11 %, Type: Forum topic , Comments: 12 comments
I always thought that the Z80 was clocked at 3.58 MHz. But when I checked the clock frequency of my NMS8245, I noticed it was 3.55 MHz. I attributed that to the fact it is over 30 years old, but today I checked the service manual and noticed it is still spot on: This is approx 0.7% slower. ...

Exact timing of IN A,() and IN A,(C)

by RvS on 16-05-2020, 11:20
Score: 174.98 %, Type: Forum topic , Comments: 3 comments
Dear MSX fans, I am trying to read data via the joystick port at a high sample rate. The IN instructions on the MSX take 12 (IN A,(n)) or 14 cycles (IN r,(C)). I am trying to figure out at what cycle the actual data is read from the bus. ...

RS232 at 57600 bps via joystick port

by RvS on 12-05-2020, 21:24
Score: 178.53 %, Type: Forum topic , Comments: 15 comments
The last months I have been trying to get a stable serial connection between a FT232 module and my MSX (NMS8245). I believe it is working now. It is still a very basic driver: just sending and receiving bytes at 57600 bps. Pin1 is RX (input) and pin6 ...
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