H8-Z80-64K-Duart Rev 4.0 board
Glyn Firth
looking for help with this board.
I have built 2 of theses boards that are fully populated (on board ram,serial ports,clock etc).
They perform great except for booting HDOS 2.0. CP/m 2.2 boots fine. When I try HDOS ( via H17 or Z67)
I get the Boot command that responds to the Enter command from the H19. HDOS boots to the point of asking to input date. at which point it freezes. Tried with disk that does not ask for date, this boots HDOS
to the > prompt. but again does to accept input from the H19. Both boards do the same.
Any ideas?
thanks
Glyn
glenn.f...@gmail.com
HDOS uses interrupt-driven I/O (CP/M doesn’t). the HDOS boot process switches to interrupt-driven operation at the point you describe, so for some reason the console IRQ3 signal isn’t being generated. If you were using an external H-8-4 board then I’d bet $ that the jumper wasn’t installed on IRQ3 for the console, but I presume that’s not your setup? Are you using the DUART serial daughterboard?
Have you checked all the jumper settings vs the configuration guide?
http://koyado.com/Heathkit/H8-Z80-64K-RTC-ORG0-V4_files/Z80_V_4_0_Jumper_Definition_V02.pdf
jumpers J9 and J10 should be inserted for normal console operation via the DUART daughterboard.
may need to see detailed pictures of the board jumper configuration…
- Glenn
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norberto.collado koyado.com
The issue is that he is using the 16C25550. The Interrupts are not compatible with HDOS 2.0/HDOS 3.0 and CPM 2.2.04. It will only works with CPM 2.2.03 as it is non-interrupt driven. He needs to get the DUART board.
Norberto
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