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#1
Technical support - Hardware related / Re: CPC 6128 - white screen, b...
Last post by McArti0 - Today at 12:28Quote from: Bryce on Today at 11:54it can't be said with certainty that the CPU acted correctly from that point onwardsThis diagram is not mine. It is borrowed from Bread80.
and the entire system was in an unknown state there after.
https://bread80.com/2021/06/03/understanding-the-amstrad-cpc-video-ram-and-gate-array-subsystem/
Fig.5
I understand what you are talking about, but for now it is not important to us because even if I have disturbed the program code, for now we want GA to stop with READY Lo and RAMRD Hi or Lo. And that's exactly what's happening. even the address is correct. You can statically check whether 373 is open and output responds to input and 373 save state. The next test will be to catch 373 in latch. i.e. the first RAM reading, READY Lo, RAMRD Lo without steps, using an external OR gate made on the 74LS02. the reading should be 00h.
#2
Technical support - Hardware related / Re: CPC 6128 - white screen, b...
Last post by Bryce - Today at 11:54Quote from: McArti0 on Yesterday at 11:01@Bryce.
Notice that the clock inverter gets a heavy zero at the input - it has no chance of ticking even once. The freeze is sure and strong.On the address lines there is &B100 or &B101. I use rectifier diodes so they have a 60ns propagation time, they may not stop at the first LDIR address.
Hi McArti0,
you may have misunderstood what I meant (or I explained it badly?).
Yes, the clock will definitely stop as planned with your setup, that's certain. My query was whether it runs properly before that point
and it seems you've just answered that question yourself with the screenshot. If you take a look at the diagram, the clock glitched
a few cycles earlier. So the clock was unstable and it can't be said with certainty that the CPU acted correctly from that point onwards
and the entire system was in an unknown state there after.
Bryce.
#3
https://archive.org/details/amstrad-cent-pour-cent-25-1990-04acme/page/55/mode/1up?view=theater
Amsdreus a score-writing utility in BASIC. Published in french Amstrad CPC magazine #25-#27
Amsdreus a score-writing utility in BASIC. Published in french Amstrad CPC magazine #25-#27
#4
Technical support - Hardware related / Re: Original CPC Multiface II ...
Last post by kbjunkie - Today at 11:29I've already reflowed the cable on the MF2 side and removed and re-crimped the cable. No difference. It looks like some of the cables in the ribbon are broken somewhere. I think the only way to sort is to replace the cable.
Do you have any parts to build the cable - the ribbon, 50 way connector on the CPC side and the solder crimp connector on the MF2 side?
Thanks,
Mark.
Do you have any parts to build the cable - the ribbon, 50 way connector on the CPC side and the solder crimp connector on the MF2 side?
Thanks,
Mark.
#5
A big Ghost'n Goblins fan, I've been collecting it on all platforms for years. This one looks better than the already great C64 and MSX remakes.
I have only one problem: I don't own a 6128 Plus yet.
I can hardly resist trying to do a 128K upgrade to my GX4000 just for this game. Of course, I don't know if I can do it but this is another story.
I have only one problem: I don't own a 6128 Plus yet.
I can hardly resist trying to do a 128K upgrade to my GX4000 just for this game. Of course, I don't know if I can do it but this is another story.
#6
Funny puzzle !
Well done
Thank you very much for your effort.
Steven
Well done
Thank you very much for your effort.
Steven
#7
Hello,
So, I may be working on a BASIC demo for a possible BASIC demo context in an upcoming demoparty.
Of course, no assembler code is allowed. Which means if I want to play music, I have to do it in BASIC as well.
I think such things exist in some old CPC games, but are there tools to do it? Or am I completely on my own entering endless lists of DATA statements with note frequencies and durations?
So, I may be working on a BASIC demo for a possible BASIC demo context in an upcoming demoparty.
Of course, no assembler code is allowed. Which means if I want to play music, I have to do it in BASIC as well.
I think such things exist in some old CPC games, but are there tools to do it? Or am I completely on my own entering endless lists of DATA statements with note frequencies and durations?
#8
More than great I'd say!
#9
#10
General Discussion - Introductions / Re: Like to do a X-Twitter lis...
Last post by Gryzor - Today at 09:10Quote from: chinnyhill10 on Yesterday at 21:03Twitter, never going back. Poisonous site.Not sure what "very good for the techy people" means. Mastodon's benefits are the same for every interest group. Yes, techy people may overcome its shortcomings, but those shortcomings basically guarantee that it'll never really take off unless something basic changes in the way it works. I consider myself to be one of those 'techy people' perhaps but I'm not willing to put up with its idiosyncrasies. For me the best social medium is the group me and a few pals have on Signal. Does this mean it's a good medium overall? Probably not.
I don't think Mastodon hit critical mass at any point and is currently withering away. Not very good for anyone.
Twitter? Yeah fuck that, I almost never visit it nowadays sadly. It's still good if you use a third party client, but Musk's stupidity and utter lack of acumen destroyed all good ones.