I just got the SID. Thanks!
Posts by davidpgil
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Don't Panic. Please wash hands.
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Thanks for your time. I really appreciate it. I know my post is a bit on the edge of relating to the C64R MKII ... I nonetheless appreciate the effort you have put in and feel inspired by your information. I hope this post gets other people excited about tinkering with the C64R MKII in a similar way.
Cheers!
David
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OK so my plan is to build a portable C64R MKII with attached mini monitor that has its own rechargeable battery, and attach another 25000mah battery pack that has two usb power outputs, one for charging the monitor battery and the other to connect to via USB to DC... I am also interested in adding solar charging as well using a battery pack that has a solar panel on it... I know my idea is a bit exhuberant, but I want to try even if its pricey and probably ridiculous looking. My hope is to make a C64R MKII that can be used as a "laptop" experience. I will probably need some type of device also attached to clean up the SVideo output on an LCD as well, but I will deal with that later
Would you like to see my potential parts list?
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Im not sure what a guest order is, but I managed to add the SID chip to an order I made today and I was not stopped. So I guess I'm going to be allowed to get it? The C64R MKII I ordered I already got months ago, so there is no shipping to combine.
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I want to try modding my C64 case to make it more portable, installing a mini monitor, etc. I am wondering if there are any issues with running the C64R MKII off of a battery. I am thinking USB to Step-Up converter to 12V DC. I am not 100% sure what is the best way to go about this. Here is an image of the device I am considering:
Please advise. -
If I already purchased C64R MKII and I would like to buy a your New Old Stock SID chip. Can I do this, please? I didn't realize you had this option when I ordered.
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OK - so the one that was CIA1 before (and is CIA2 now) is the faulty one, you should replace it (and expect other problems if you dont do it)
as to the WHY - the CIAs are the C64s I/O chips, they are connected to various peripherials, for the most part the keyboard, the joysticks and the IEC bus (drives). you can look up the details here: CIA1 Port A CIA1 Port B CIA2 Port A CIA1 Port B.
now, to find out what kind of odd side effects you might expect, look at the keyboard matrix. the left shift key is in the 7th row (bit1 of port a) and the first column (bit 7 of port b). first of all you want to find out which of these is actually defective - for that try all keys of the respective row or column - all of them should show the odd behaviour you have observed with shift. (if that is not the case, try the row/column that has the ? key in it). once you found that out you can look up what these bits are connected to by looking at the tables above - maybe you are lucky and its one of the lines that goes to the userport (rs232), then you could keep using the broken CIA as CIA2 (if you are not using the userport that is). in all other cases you will see misbehaviour, either problems with the IEC bus, or graphics corruption in some programs.
Thank you! I think it would probably best to just use different CIA. I have one spare of the 6XXX CIA. Can I drop that one in with my 8XXX CIA?
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i have used my MK2 quite a bit and i can assure you there is no general problem with the shift keys
Haha, I meant no offense!
OK, so swapping the CIA chips fixed the problem! I would love to know WHY though. But for now, I just want to say THANK YOU! This issue was quite annoying.
I wonder what odd behavior I can expect next from the semi-faulty CIA I have...
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and no other keys are affected? is it only the questionmark that behaves odd with shift? i'd expect any other key showing the same problem (and i still think its a contact problem)
Did you swap the CIAs against each other to check if the problem persists?
I have noticed the Cursor Keys and both affected this way as well. I have yet to try the CIA swap yet. I will update when I do.
Have you/someone on your team tested my issue on their own C64R MKII ?
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what makes you so sure? if you hit ? a few times, do some of them appear?
I am certain because 100% of the time "?" does not appear under the conditions I described. Again, once I type other characters, then type "?", 100% of the time it appears.
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Please also see if the shift-lock key works as expected. It is hard-wired to the left shift key.
I confirmed that the Shift Lock key has the same behavior I described.
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Reading again what you typed -- you said this! Sorry to make you type it all out! Thank you.
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no, the user manual is correct. but inserting that line 25 into the program (which i assume you did) will result in the values from the previous loop iteration being shown on screen. using the same line but as 45 - after the pokes - will show the right numbers (which will then also match the table from the manual). it is a simple bug in the program
I see no line 45 in the code I posted. Would you clarify for me?
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dirty contacts in the keyboard?
Nope. This is consistent for me.
If I type:
... I am unable to type "?" with the Left Shift key. However if I type:
...The Left Shift key works fine.
Would you help me confirm this?
... I wonder if its an obscure problem with one of my chips.
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Pretty sure the colors are right - there is no way the MK2 board could even produce different ones (the VICII produces them).
Which color do you think is wrong?
edit: instead of adding that line 25, add the same as line 45 (and remove line 25) - else the numbers printed on screen will be from the previous iteration of the loop
Line 45? Where? Are you saying the C64 User Manual is wrong?
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On page 61 and 62 of the C64 User's guide has some example code that is supposed to show the user about changing border and background colors. The numbers and visuals are supposed to relate to the the following key:
The following code does not produce colors that match this key. So, I am wondering if the C64R MKII is not accurate enough? Is there a bug in the manual? Did I miss something?
Please advise.
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I have been noticing that the Left Shift key does not Function as expected in all cases. Often when started a line of BASIC code I want to press Left "Shift + /" to get a "?" but instead nothing happens. After typing other characteers then attempting athe same key combination works fine. I have noticed this as well with the cursor keys but, lets just start with the first example I gave.
My Right Shift key works fine with this combination perfectly. Why could this be happening?
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OK -- Apparently I've outsmarted myself. This morning I tried my MKII on another LCD screen that had component connections and managed to get the picture to show... I then recalled that my computer monitor NOW has an HDMI splitter that I've grown accustomed to auto switching to whichever HDMI input is powered on. For whatever reason it doesn't auto switch the S-Video to HDMI with this converter box I am using.
To fix my "Black Screen" all I neeeded was to manually select the correct input... So, my issue is fixed now.
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no - this only indicates that one or more ICs could not be detected (which is quite expected when you removed them :=))
Haha.
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Another valuable source of information is the remote control menu. Read all about it in the WIki article:
I managed to get into the remote control menu as you have indicated. I haven't found it useful for identifying which chip may be having issues though. I have the black screen again now and am trying to troubleshoot it.
