Closed LumaTOLB - LumaFix with TOLB combo
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Deleted member 14264
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Unfortunately, IDT/ICS has announced they will discontinue the 525-01R clock multiplier/divider. The circuit is presently listed as 'last time buy' at various distributors so I purchased 100 of them before they vanish.
Both TOLB and LumaTOLB are based on this IC so they are both on 'life support' at this point. I have 34 boards left for LumaTOLB and 69 boards left for TOLB. I will be making boards in small batches after these sell out to cover the matching inventory of 525-01R ICs.
There won't be a LumaTOLB for the C128 unfortunately.
Both TOLB and LumaTOLB are based on this IC so they are both on 'life support' at this point. I have 34 boards left for LumaTOLB and 69 boards left for TOLB. I will be making boards in small batches after these sell out to cover the matching inventory of 525-01R ICs.
There won't be a LumaTOLB for the C128 unfortunately.
Retrofan
Member
Then I want to order a Tolb one for my C128. Do you have them? (I'm declaring interest if you can't make the 128 LumaTolb).
Edit: What about Ebay? https://www.ebay.es/itm/ICS525-01R-...321810?hash=item2ec89e6e92:g:U7kAAOxykVNRu49a
Edit: What about Ebay? https://www.ebay.es/itm/ICS525-01R-...321810?hash=item2ec89e6e92:g:U7kAAOxykVNRu49a
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D
Deleted member 14264
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TOLB is still available. See: https://www.amibay.com/showthread.php?89128-8701-replacement-meet-TOLB
The link for the listing you provided for 525-01R ICs offers them at a very high price for units that are not lead-free. The photo indicates these were made in the 36th week of 2000, that's 18 year old chips.
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D
Deleted member 14264
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The VIC-II video chip of the C64 requires 2 independent but synchronous clock signals to work properly - they are called the dot clock and the color clock. On early C64 boards, these 2 signals were generated with a crystal and a cluster of logic ICs along with a PLL analog IC.
Starting with board 250425, the cluster of ICs and PLL were replaced with a single custom IC named 7701 and later 8701. They both do the same job and are fully pin compatible but the 8701 uses more modern HMOS technology while the 7701 uses older NMOS and uses more power.
The 8701 ended up being used on boards 250425, 250466, 250469 (the 64c) and all versions of the C128.
Since this is a custom IC from MOS/CSG, nobody makes a drop-in replacement.
TOLB is a drop-in replacement made using only new components but unlike the real 8701, it has its own oscillator and is independent of the crystal installed on the C64 board or jumper setting and uses minutes amount of power. This makes it easy to convert a PAL C64 into an NTSC one or inversely. The downside is, TOLB itself cannot be converted; if you buy the NTSC flavor, it will always give you NTSC frequencies and the same for the PAL flavor.
The exact frequencies are:
- NTSC color clock is 14.31818 MHz
- NTSC dot clock is 8.18182 MHz (4/7 times the color clock derived from the same source as the color clock)
- PAL color clock is 17.734475 MHz
- PAL dot clock is 7.8812 MHz (4/9 times the color clock derived from the same source as the color clock)
The PAL/NTSC jumper on the C64/C128 board is used to tell the 8701 if the conversion ratio is 4/7 or 4/9. This jumper is disregarded by TOLB.
Since older C64 boards 326298, KU14194 and 250407 do not use the 8701, LumaTOLB is a board inserted under the VIC-II and is the only replacement solution in case the clock generating IC cluster malfunctions or the owner wishes to convert from PAL to NTSC or inversely. Just like TOLB, LumaTOLB has a built-in oscillator and cannot be changed from/to PAL/NTSC - you must specify the type you want.
BTW, the forum tried to destroy my post...
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Oh thanks so much for that explanation! Since you can only buy a TOLB of one frequency, this does not do exactly what I'd like for the one machine I am working on right now
Do you still have LumaFix without this?
And for this model, do you need to remove the internal crystal if you install it on a PAL C64C?
How do you do the Luma fixing btw? I saw other solutions that had potentiometers but I see none here.
Thanks!
Do you still have LumaFix without this?
And for this model, do you need to remove the internal crystal if you install it on a PAL C64C?
How do you do the Luma fixing btw? I saw other solutions that had potentiometers but I see none here.
Thanks!
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D
Deleted member 14264
Guest
What is it exactly you'd like to do?
I never did and I still don't
Answered above
unlike the real 8701, (TOLB or LumaTOLB) has its own oscillator and is independent of the crystal installed on the C64 board or jumper setting
The photos on the very 1st post of this thread show 2 footprints for pots identified Phi0 and AEC.
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The problem is this machine I want to swap between NTSC and PAL so if the unit ignores the internal crystal and uses what's on board, it'd mean I'd need two boards, and that's not what I want.
So is this actually a kit? The pics in the first page show a semi populated board. Sorry, confused again.
Thanks for your answers!
D
Deleted member 14264
Guest
You will also need 2 different VIC-II circuits because they too are fixed for PAL or NTSC. You will have to swap the VIC-II every time you want to swap between PAL and NTSC
No, it's not a kit. The footprint simply indicates where I solder the potentiometers and they are exactly the same as those used on LumaFix.
D
Deleted member 14264
Guest
Still available in both NTSC and PAL flavors!
D
Deleted member 14264
Guest
Received AU dollars!
Please note I pay the Paypal fees and never ask my customers to send the funds as 'payment to family or friends' or to add extra funds to cover these fees.
Considering the volume of sales I have, I don't cheat on Paypal as I don't want problems with them. These fees are already included in the amount I charge.
SnakeGrunger
Conjurer of Solder
Could you replace the IC with one of these that are not immediatly discontinued ?
Edit : https://www.digikey.ca/products/en/...ity=0&ColumnSort=0&page=1&stock=1&pageSize=25
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D
Deleted member 14264
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In the list of ICs in your search, only 2 are 525-01R and both have the same warning message...
All the other ones are 525-02, a different IC which is both considerably more expensive and requires a different design. The least expensive member of this family is also on 'Last Time Buy' status.
D
Deleted member 14264
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PM sent!I'm very interested in picking up one of each (NTSC and PAL), how do I go about purchasing from you?
PM sent!I'm very interested in picking up one of each (NTSC and PAL), how do I go about purchasing from you?
Many thanks, sir!
[Edited remainder of this post in hopes that eslapion honors his end of the deal, he said that if I remove this post then he might continue to do LumaTOLB runs... I owe it to everyone to do so in hopes he does the thing.]
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D
Deleted member 14264
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Unfortunately, I already posted there wouldn't be any and I clearly indicated why...Looking forward to your 128 variant as the units I have need a lumafix like none other!
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