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

by DarkSchneider on 22-02-2023, 16:31
Score: 193.87 %, 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: 193.82 %, 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: 193.34 %, 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: 192.9 %, 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 ...
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