Recent posts

#1

Technical support - Hardware related / Re: CPC 6128 - white screen, b...

Last post by McArti0 - Today at 14:04

I am not sure I do understand what you mean by stopping GA, GA will only stop if you stop the clock.

Take a look at the illustration in post no. 100. GA stops itself due to the Lo signal on pin 1 of 244. This freezes the clock generator. I'll never believe you could be as blind as Bryce It's not like you.

#2

I

Programming / Re: My 2D platformer in BASIC

Last post by IndyUK - Today at 13:58

1000x is the turbo mode 
At least what is written on the right down corner.

Go to the General tab in winape and look towards bottom right and you'll see a tick box labelled Turbo mode. That's what I use. 

#3

Technical support - Hardware related / Re: CPC 6128 - white screen, b...

Last post by McArti0 - Today at 13:58

I'm starting to think that this is some sort of never ending April fools joke..

Then prove to him that his memory is faulty. So far I have found out that the 3rd byte of the Rom has the value 8A instead of 89. If at all he did it well with 3 people. For now, it turns out that z80 writes to frames. And that the ram has the correct contents. Maybe you could stop being mean and start helping.

#4

M

Technical support - Hardware related / Re: CPC 6128 - white screen, b...

Last post by mmldrm - Today at 13:55

Have you often confirmed that pin1 244 is 0?

I just bought some hook probes (now that I know that the are suitable) and evicted my family members from the team.

These should arrive by Friday, and will allow more reliable results.

#5

M

Technical support - Hardware related / Re: CPC 6128 - white screen, b...

Last post by mmldrm - Today at 13:49

I am not sure I do understand what you mean by stopping GA, GA will only stop if you stop the clock. Otherwise it will continue to output catch clock an will send RAS CAS to memory. And that will influence what you see on the right side of LS244.

You may hunt a ghost here esp. with the only tool available being a voltmeter.

Also if you see 1.5V on the left side, you have either not stopped the CPU or something is influencing the D7 line.

And again a Voltmeter is not good to troubleshoot digital logic.

I do have an oscilloscope now (the one that you suggested), if that gives more options to try.

(I might also buy those mini grabber clips, rather than trust the assistance of my kind but inexperienced family members.)

#6

D

General Discussion - Introductions / Re: Interview with James Higgi...

Last post by Dubliner - Today at 13:43

It's been an honor being able to speak to such a nice guy as James. It's one of the longest interview that I ever made but it was absolutely worth it. Thanks everyone for reading and follow him on Twitter if you still use it

#7

M

Technical support - Hardware related / Re: CPC 6128 - white screen, b...

Last post by mmldrm - Today at 13:42

I'm starting to think that this is some sort of never ending April fools joke. The initial failure you showed in the very first post is a classic symptom of a failed RAM and by far the most likely culprit. But instead of just swapping them and getting on with life, you've now spent over a month doing ends tests of questionable usefulness, which don't really tell you anything for certain and some of which were definitely totally pointless.

So I really have to ask. Why don't you just swap the RAMs?

I genuinely apologise if this comes across as trolling or something. It isn't. I'm just trying to follow instructions from whoever is willing to take the time to help me.

As it isn't my 6128, nor my budget, I've been trying to avoid purchasing anything unnecessarily. For example, I'd love to go buy a Dandanator, but I can't justify it for this one-off investigation.

I did buy 64Kb of RAM (and sockets), but I think McArti0 managed to diagnose that the fault lies elsewhere (IC114/IC115 maybe?).

I could replace the RAM. I just hoped that we could get a definite diagnosis of where the fault lies first, rather than risk my soldering skills introducing more doubt.

I did buy a oscilloscope, so if that in any way helps to diagnose at this point then I'm more than willing to justify the purchase by using it.

#8

Programming / Re: My 2D platformer in BASIC

Last post by VincentGR - Today at 13:41

1000x is the turbo mode 
At least what is written on the right down corner.

#9

General Discussion - Introductions / Re: CPCRadio module

Last post by Bryce - Today at 13:40

I suppose it's cool because it hasn't been done before.

A radio for the CPC has been done already around 2017, it is called SE-One and produced by Hans/TMTLogic. There was both an MSX and a CPC version, I still have the latter one:

You cannot view this attachment.

Beside playing FM radio...

https://www.youtube.com/watch?v=vvlGBS3nNiY
...it was fully compatible to the old MP3MSX hardware (like the SF3 etc.) and so was able to play MP3s as well.

Indeed TMTLogic produced a DAB radio later as well. Unfortunately his website is a little bit limited now, but there are links to a huge Google Docs repository.

There are players for both the FM and the DAB radio hardware in SymbOS, developed by EdoZ:
http://www.symbos.de/appinfo.htm?00053
http://www.symbos.de/appinfo.htm?00052





But I guess it's not compatible to this new hardware.

Wow, that's a massive amount of components just for a radio! Did it have a whole list of further features?

Bryce.

#10

Technical support - Hardware related / Re: cable DDI-1 for CPC 6128

Last post by Bryce - Today at 13:38

Yup, because Amstrad messed up the pin numbering too!

Bryce.