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

by DarkSchneider on 22-02-2023, 16:31
Score: 200.27 %, 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: 200.22 %, 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: 199.74 %, 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 ...

Disk read disables interrupts?

by DarkSchneider on 12-04-2020, 12:20
Score: 169.43 %, 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 ...

OTIR strange behavior, does not allow to modify HL

by DarkSchneider on 16-09-2019, 12:20
Score: 165.22 %, 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 ...

VDP access preventing interrupt triggering?

by DarkSchneider on 16-09-2019, 09:07
Score: 165.33 %, Type: Forum topic , Comments: 4 comments
interrupt request from VDP will canceled when the register status 0 or 1 will be read. DarkSchneider ... DIs), it only stops when VDP status register 0 is read (for vblank int) or status register 1 (for hblank ...

Konami Gradius saga not synced by VBLANK

by DarkSchneider on 05-08-2019, 11:17
Score: 164.54 %, Type: Forum topic , Comments: 1 comment
Testing some games with the Turbo option, I noticed that Konami's Gradius saga runs too fast. Seems like they "synced" the games adding NOPs for the Z80A and go straight. Tested some other Konami games like Galious or Usas and they run ...

TCP/IP UNAPI on GR8NET?

by DarkSchneider on 21-10-2018, 10:41
Score: 160.03 %, Type: Forum topic , Comments: 8 comments
Hello, I'd noticed that GR8NET was updated to support UNAPI 1.0. Has someone tested if TCP/IP UNAPI or Internestor Lite (if not executed by hardware) works on GR8NET currently?. It works perfectly. It works perfectly. Nice. It implements its own Nice. It implements ...

All MSX has PCM sound

by DarkSchneider on 20-05-2018, 10:07
Score: 157.85 %, Type: Forum topic , Comments: 23 comments
data in periods and not continuosly. https://youtu.be/dmI2XZ0PBzQ Edit: OK the Atari ST has ... to calibrate a 16-bit wait counter, if the period of the calibration sample is 1/60s that means just 0 ... to calibrate a 16-bit wait counter, if the period of the calibration sample is 1/60s that means just 0 ...

Some way to put ASCII text code on SC4 patterns table?

by DarkSchneider on 10-04-2018, 15:54
Score: 157.12 %, Type: Forum topic , Comments: 2 comments
The BASIC does it by itself when you use SCREEN command. But not using BASIC, I'd like to set the pattern table to the ASCII code for writing text in a tool. Don't know if there is some BIOS function to do it. What does the ASCII code ...
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