Author Topic: Changing CRTC  (Read 6053 times)

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Offline protek

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Re: Changing CRTC
« Reply #25 on: 22:04, 07 January 13 »
Yup, I've ordered some memory before for my RTG card and those worked.

Offline Bryce

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Re: Changing CRTC
« Reply #26 on: 22:08, 07 January 13 »
I'd certainly order there again and probably will in the near future. I've just checked my orders and I've tonnes of stuff from them:

AD724
µP765
SED9420
FDC9266
27C160
27V160
WDC1770
WDC1772

And a few hundred 74LSxx ICs as well. Not a single fake among them. If you are ordering big numbers of parts I'd recommend doing it from their site and getting a quote, rather than ordering through ebay.

Bryce.

Offline TFM

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Re: Changing CRTC
« Reply #27 on: 22:15, 07 January 13 »
Just out of curiosity: Would it be possible to solder different CRTCs over each other and only activate the Chip-select signal of one of them. So a switch could select one of them. Or do I miss something?
 
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Offline Bryce

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Re: Changing CRTC
« Reply #28 on: 22:28, 07 January 13 »
No. As mentioned earlier (can't remember who, it wasn't me :( ), the CRTC is always outputting a signal and reading RAM, the CE is actually a CS, so it only enables / disables the address input lines, not the entire IC.

Bryce.

Offline protek

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Re: Changing CRTC
« Reply #29 on: 22:32, 07 January 13 »
Bryce, do you remember what kind of delivery times Utsource has had? Mine was shipped yesterday from Hong Kong. I did the transaction already before Christmas, though.

Offline Bryce

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Re: Changing CRTC
« Reply #30 on: 22:40, 07 January 13 »
Around Christmas is never going to be a good time. I think most of my stuff arrived between 15 to 30 days from the order date.

Bryce.

Offline TFM

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Re: Changing CRTC
« Reply #31 on: 22:46, 07 January 13 »
No. As mentioned earlier (can't remember who, it wasn't me :( ), the CRTC is always outputting a signal and reading RAM, the CE is actually a CS, so it only enables / disables the address input lines, not the entire IC.

Bryce.
May be there any other pin usable? Vpp?
TFM of FutureSoft
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Offline Bryce

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Re: Changing CRTC
« Reply #32 on: 22:55, 07 January 13 »
Maybe, you'd need to test it. You also couldn't put many in parallel, the analogue outputs will all have resistors to ground, so each extra CRTC effects the image a little, even if it's not powered.

Bryce.

Offline TFM

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Re: Changing CRTC
« Reply #33 on: 22:58, 07 January 13 »
Ok, so back to the text tool socket.
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Offline Bryce

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Re: Changing CRTC
« Reply #34 on: 23:02, 07 January 13 »
Would a ZIF Socket fit in there? They are pretty high, would it not hit the keyboard?

Bryce.

Offline TFM

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Re: Changing CRTC
« Reply #35 on: 23:05, 07 January 13 »
Good question, rather not. But I haven't been completely serious.  ;)  The best way is probably to just switch the keyboard instead of the CRTC. Ok, so you need at least three CPC6128 keyboards.  :laugh:
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Offline db6128

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Re: Changing CRTC
« Reply #36 on: 00:47, 08 January 13 »
I’ll stick with a normal socket and just use a screwdriver if I need to. :P
[The owner of one of the few existing cartridges of Chase HQ 2] mentioned to me that unless someone could find a way to guarantee the code wouldn't be duplicated to anyone else, he wouldn't be interested.
Did he also say things like "My treasureeeeee" and is he a little grey guy?

Offline TFM

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Re: Changing CRTC
« Reply #37 on: 04:03, 08 January 13 »
That could be more often the case when watching demos...
« Last Edit: 04:05, 08 January 13 by TFM/FS »
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Offline protek

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Re: Changing CRTC
« Reply #38 on: 08:55, 15 January 13 »
Just received notification that the new CRTC had arrived in Oulu. Stay tuned....  ;)

Offline protek

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Re: Changing CRTC
« Reply #39 on: 23:07, 15 January 13 »
Received the new CRTC chip today from UtSoucre. It is a HD6845SP, which is type 0, if I remember correctly.


Since I had the socket already in place, it was a simply a matter of plugging the new chip in and we were set.



Phew! Safely in Locomotive Basic! :D

Now the moment of truth. Are we able to run the Batman Forever demo, which wouldn't run on the original type 2 CRTC?


So far so good...

And here we go! :D




Was it worth the trouble? Definitely. I've been hoping to see Batman Forever demo on real hw for some time.

If someone has the type 2 by Motorola in their Amstrad and wishes to upgrade, UtSource has the type 0 by Hitachi for sale at eBay.

Offline db6128

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Re: Changing CRTC
« Reply #40 on: 23:41, 15 January 13 »
Good to know that the SP works just as well as the S, which is the one quoted in all the tables online.
 
I bought a type 1 (UM6845R) and have a type 0 (UM6845) in my ailing 464, so I will replace the type 2 in my 6128 eventually. But the socket I ordered hasn’t arrived. :|
[The owner of one of the few existing cartridges of Chase HQ 2] mentioned to me that unless someone could find a way to guarantee the code wouldn't be duplicated to anyone else, he wouldn't be interested.
Did he also say things like "My treasureeeeee" and is he a little grey guy?

Offline TFM

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Re: Changing CRTC
« Reply #41 on: 22:57, 16 January 13 »
Patience is a virtue  ;)   Code a 16 KB ROM game meanwhile  ;)
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Offline Syncmaster319

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Re: Changing CRTC
« Reply #42 on: 01:03, 09 March 19 »
Hi all,

Sorry to resurrect this old thread but search brought me here and wondered if the advice was any different.

I have a newly acquired near mint 6128 which was an eBay impulse purchase.  No regrets!

Unfortunately it has a CRTC 2 so a lot of the good demos don't run.  Is it still the case I can swap the CRTC out? 

If so which CRTC would you recommend and where can I purchase both a socket and a compatible chip?

Thanks in advance!
Mark

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Re: Changing CRTC
« Reply #43 on: 01:30, 09 March 19 »
May be someone programming demo will enjoy to exchange a mainboard for your CRTC2 version instead?
Else, I should provide you a socket and a CRTC 1 if you want the good one to run most demos.



Hi all,

Sorry to resurrect this old thread but search brought me here and wondered if the advice was any different.

I have a newly acquired near mint 6128 which was an eBay impulse purchase.  No regrets!

Unfortunately it has a CRTC 2 so a lot of the good demos don't run.  Is it still the case I can swap the CRTC out? 

If so which CRTC would you recommend and where can I purchase both a socket and a compatible chip?

Thanks in advance!
Mark
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