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Is there a way to get Program Counter (PC) on Z80?

by DarkSchneider on 22-02-2023, 16:31
Score: 191.79 %, Type: Forum topic , Comments: 8 comments
and has some part like this: if content of some address != 0 then call it, if not continue. As ... in a fixed memory location: somewhere_hook: jp 0x0000 Somewhere_hook is a fixed location and followed ... instructions `pop hl : jp (hl)` to VRAM at fixed address like 0x4000, and `call 0x4000` will load HL ...

SC bitmap file format header?

by DarkSchneider on 21-02-2023, 10:22
Score: 191.74 %, Type: Forum topic , Comments: 8 comments
What I have found is that are 7 bits, but not the content. Has someone the content of the header for SC bitmap files? Also, the BLTVD subROM function, expects only NX and NY, or the full SC header? For descriptions I have found, it only says that NX ...

How much exact time consumes a DOS2 inter-segment call?

by DarkSchneider on 14-02-2023, 16:20
Score: 191.26 %, Type: Forum topic , Comments: 2 comments
Hi, as title says, someone knows the exact extra time/instruction/cycles used by doing a DOS2 inter-segment call compared to a direct call? If you really want to know If you really want to know that kind of details, see ...

Save some settings?

by DarkSchneider on 10-02-2023, 18:10
Score: 190.82 %, Type: Forum topic , Comments: 18 comments
change the value of bit #7 at address 002Bh in the BIOS and set it to 0. Cf. ... in the Bios/Basic rom, modify address 0x002b from 0x91 to 0x11. This doesn't change anything, it's just for identification. Then modify address 0x7bd7 from 0x02 to 0x00. This is the VDP patch routine that sets up PAL. The ...

openMSX 17.0 for Apple Silicon broken

by DarkSchneider on 02-06-2022, 15:41
Score: 181.59 %, Type: Forum topic , Comments: 15 comments
http://msx.ebsoft.fr/openmsx-18.0-mac-aarch64-bin.dmg.zip Are the the GUI and debugger Are the the GUI and debugger also available? I use ... for on the download section of the website, for 18.0. Edit: yes, confirmed. That one worked on Sandy's M1 ...

Disk read disables interrupts?

by DarkSchneider on 12-04-2020, 12:20
Score: 160.94 %, Type: Forum topic , Comments: 3 comments
I opened the disk ROM and found is plenty of #F3 (DI), so I suppose that indeed it disables interrupts, but prefer to ask to be sure. Yes.. It disables Yes.. It disables interrupts... OK for FDD I suppose that's OK for FDD I ...

Linux openMSX debugger binaries here

by DarkSchneider on 10-04-2020, 17:43
Score: 160.46 %, Type: Forum topic , Comments: 0 comments
Hello, for those who use Linux and want to use the debugger, here the binaries: deb: https://1drv.ms/u/s!AhQqCoPY5hXqjuEX8ofT6ztasIFBOQ?e=EBJtN9 rpm: https://1drv.ms/u/s!AhQqCoPY5hXqjuEWN0ETJZqHlxYkyA?e=KwIXUu The RPM was generated using alien, so it could warn about not signed rpm. Don't worry just ignore and follow. ...

Can MP3 cards play music in background?

by DarkSchneider on 04-12-2019, 11:32
Score: 158.14 %, Type: Forum topic , Comments: 11 comments
I wonder if MSX MP3 card devices can play MP3 music in background by its own working as co-processor. I know about the MP3 card and that the GR8NET can be flashed as one. Don't have any so maybe someone could solve my question. At least ...

Improving MSX-DOS2 ISR

by DarkSchneider on 02-10-2019, 13:04
Score: 157 %, Type: Forum topic , Comments: 0 comments
I was thinking about that on computers plenty of RAM the ISR and its BIOS accesses could be improved. The "driver" process would be like: - Reserve a segment as system. - Clone BIOS into that segment. - Modify MSX-DOS2 38H called ...

OTIR strange behavior, does not allow to modify HL

by DarkSchneider on 16-09-2019, 12:20
Score: 156.73 %, Type: Forum topic , Comments: 1 comment
Well, I want to make a copy in a row from different sources, if I do this: set HL, DE, C values ld b, SIZE otir add hl, de <- THIS ONE IS IGNORED, EVEN IF I DO LD HL, 0 ld b, SIZE otir But if I do: set HL, DE, C values ld b, SIZE - 1 <- NOTICE DIFFERENCE otir outi add hl, de ...
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