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rfka01 #105968 06/08/16 04:15 PM
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And of course I forgot one label on my chart above:

VIDOUT = video output from DC011 video ASIC


"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
rfka01 #105982 06/10/16 02:34 AM
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CP/M finally.


This only works if the index pulse irq is suppressed when the fdc is busy. I'd like to know if there are any other examples of currently working machines/software when enables the index pulse irq before submitting to make sure it doesn't break anything.

rfka01 #105985 06/10/16 07:24 AM
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*opens virtual bottle of beer*

Cheers!

Great news ... but the case of the missing irq is strange indeed ... maybe something with the esoteric RX50 drives?


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
rfka01 #105986 06/10/16 07:55 AM
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That actually makes some sense that the index pulses wouldn't be passed on while the FDC was busy, but yeah it definitely needs a lot of regression testing.

rfka01 #105994 06/10/16 07:00 PM
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I can't find any other software which even enables the index pulse irq much less is regressed with this change. There are just so many machines with fd197x fdcs though, I can't test them all.

rfka01 #105995 06/10/16 08:21 PM
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board config option maybe, with default as the old way?


Because I can
rfka01 #106007 06/11/16 03:12 PM
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The old fd197x emulation had many per-machine hacks. Don't really want to go there again.

rfka01 #106049 06/16/16 07:16 PM
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Hello,

have tracked down a weird CPU bug: if i do a soft reboot from within SETUP with CTRL-SETUP (a key combination from the the manual) the Z80 corrupts the 808x address space with stack data.

What i found out:

* BIOS begins an extensive memory test (BITTEST_AX) -

https://github.com/shattered/retro-bios/...-022e5-00#L3931

* problem gets visible at this location:

https://github.com/shattered/retro-bios/...-022e5-00#L4175

- BX is current address
- AL contains XOR result of correct and actual value

Z80 writes to $07f0/$07f1 (reflected at 808x offset $87f0/$87f1).

RESULT: ERROR 19 Main Board RAM (0-64K)

Why does the Z80 interfere with the memory test?

There is a reasonable suspicion the ZFLIP flag is set or handled wrongly. I just cant find where...

P.S.: floppy test on the DIAG.DISK (from 'indiviual tests') now aborts with a 'Z80 response error'. Coincidence?

Any ideas? :-)

Screenshot of Z80 caught in the act:

https://dl.dropboxusercontent.com/u/37819653/BANNISTER/Z80_writes_to_8088_memory.jpg

Last edited by Bavarese; 06/16/16 08:04 PM.
rfka01 #106050 06/16/16 08:23 PM
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are the flags reset to their appropriate values in device_reset? if anything is only set in device_init and not _reset, and/or is not reset properly by whatever the ctrl-setup reset function does (does it somehow activate one of the reset lines on the board itself thru an i/o port, sort of like how the RESET opcode on the 68000 causes the reset pin to output 5v?)

LN


"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
rfka01 #106051 06/16/16 08:37 PM
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(Unrelated to Bavarese's problem):
If you run the rainbow driver compiled from latest git, you get

Code:
Fatal error: install_ram_generic: In range ed000-ed0ff mirror 1f00, mirror touches a set address bit, did you mean f00 ?


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
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