Search found 55 matches

by Maziac
Fri Dec 14, 2018 3:02 pm
Forum: ZX Spectrum Next
Topic: Games & SD Card
Replies: 11
Views: 1561

Re: Games & SD Card

OK, I understand.

That minimum OS what is this exactly?
by Maziac
Fri Dec 14, 2018 6:47 am
Forum: ZX Spectrum Next
Topic: Games & SD Card
Replies: 11
Views: 1561

Games & SD Card

Hi, I don't got any ZX Next HW yet, so maybe this question is a little dumb. Please forgive. There are some games out (like Dungeonette) and physically sold. I guess those come on an SD card. How is the SD Card handling if such a game is started? The ZX Next has one SD Card slot as far as I can see....
by Maziac
Sat Nov 17, 2018 4:58 pm
Forum: Software
Topic: Bank switch to Next OS
Replies: 6
Views: 1578

Re: Bank switch to Next OS

Thanks for the info but I still haven't been able to switch to the original 48k ROM. Could you maybe tell me exactly what bits I have to set in 0x7FFD and 0x1FFD. My situation is that I start a sna file from the browser. Then when my program got control I disable the interrupts, setup a stack and th...
by Maziac
Mon Nov 12, 2018 3:54 pm
Forum: Software
Topic: Bank switch to Next OS
Replies: 6
Views: 1578

Re: Bank switch to Next OS

- Ahh, I see. My writing of 0xFF to mmu0 and mmu1 may not have worked because I need to disable writing in port 0x123B first.
- To switch to esxdos/ROM3: what do I have to do? Is it writing 0x04 to port 0x1FFD and 0x10 to port 0x7FFD?
by Maziac
Sat Nov 10, 2018 5:52 pm
Forum: Software
Topic: Bank switch to Next OS
Replies: 6
Views: 1578

Bank switch to Next OS

Hi, I have a problem with the bank switching. I would like to use some Next OS/esxdos function (load/save) then switch in the original Spectrum ROM and later when I need load/save again then switch back to Next OS. However I can't find a way to do this. So what register do I have to fill to switch t...
by Maziac
Wed Oct 24, 2018 3:34 pm
Forum: Software
Topic: Copper
Replies: 5
Views: 1321

Re: Copper

Many thanks for the comprehensive answer. What is the supposed way to read the current raster line? There are 2 bytes for high and low byte at register 30 and 31. I.e. it has to be read one byte at a time. If the raster line changes just in between the 2 byte accesses the result would be completely ...
by Maziac
Tue Oct 23, 2018 5:18 pm
Forum: Software
Topic: Copper
Replies: 5
Views: 1321

Copper

Hi all, I have a few questions regarding the Copper implementation. Writing the index to the "Copper control bytes": is this the index at which the program should start or is it the index for the next write to the "Copper data" register? If I write more than 2k data (1k instructions) to the "Copper ...
by Maziac
Fri Sep 14, 2018 10:26 am
Forum: Software
Topic: SETAE
Replies: 6
Views: 1043

Re: SETAE

Yes, I'm using it in a completely different context.
It is still usable. I just work the other way round now.
by Maziac
Thu Sep 13, 2018 7:53 pm
Forum: Software
Topic: SETAE
Replies: 6
Views: 1043

Re: SETAE

Thansk for the info, I hadn't expected that.
by Maziac
Thu Sep 13, 2018 4:56 pm
Forum: Software
Topic: SETAE
Replies: 6
Views: 1043

SETAE

Hello,
the specification is a little vague about this instruction:
will it just set the bit and leave the other bits alone or will it zero out A before setting the bit.

E.g. What is the result of this:
LD A,10000000b
LD E,2
SETAE

Will it be
A=00000100b
or
A=10000100b
?