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by eslapion
Fri Jan 19, 2018 2:04 pm
Forum: Other Systems
Topic: Strange-looking C64
Replies: 4
Views: 86

Re: Strange-looking C64

mrr19121970 wrote:I have one like this. 20 quid new back then. Now they are considered rare & collectable.

I guess there aren't that many of them. I saw one for the 1st time a month ago in Toronto.

Only saw photos of these cases before.
by eslapion
Fri Jan 19, 2018 1:22 am
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 144
Views: 2715

Re: 6561 Die Shot Reversing Explorations

Radical Brad wrote:Perhaps that nice old 6567 would rather not die, and instead become part of my large collection of ancient ceramic chips?
... just checkin!

Brad

I would really like to reserve this specific unit to become a documented IC. I want to make sure I 'open it up' correctly.
by eslapion
Thu Jan 18, 2018 4:51 pm
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 144
Views: 2715

Re: 6561 Die Shot Reversing Explorations

Well, sounds more like you should steady your Dremel before you start. A better option is to use a CNC mill: https://openbuilds.com/builds/openbuilds-minimill.5087/ I did steady my Dremel. I cut lots of other stuff with it but I guess if you hit either the ceramic or the black cover just a little b...
by eslapion
Thu Jan 18, 2018 12:20 pm
Forum: General Topics
Topic: My new product
Replies: 8
Views: 148

Re: My new product

Floopy wrote:Why would you want to eat a computer?
Or your favorite logo?
:lol:

It's just a different interpretation of the expression 'vertical integration'... 8)
by eslapion
Thu Jan 18, 2018 11:24 am
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 144
Views: 2715

Re: 6561 Die Shot Reversing Explorations

Hot air gun. The cover is soldered in place. Brad I do have a very good hot air gun which will liquify tin-lead solder. Its not tin-lead, that would not work on ceramic packages. Most often its an Indium alloy (In-Sn or In-Ag). Indium tend to wet most things (unlike Tin), so you probably end up cov...
by eslapion
Thu Jan 18, 2018 9:13 am
Forum: General Topics
Topic: My new product
Replies: 8
Views: 148

Re: My new product

Not very sophisticated but it seems a nice complement to a good meal. :D
by eslapion
Wed Jan 17, 2018 8:28 pm
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 144
Views: 2715

Re: 6561 Die Shot Reversing Explorations

Hot air gun. The cover is soldered in place. Brad Can somebody tell me what is required to make a clean cut through which won't damage the die ? And preferably not destroy my cutting tool... I do have a very good hot air gun which will liquify tin-lead solder. WIll this trick also work with this: h...
by eslapion
Wed Jan 17, 2018 3:12 pm
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 144
Views: 2715

Re: 6561 Die Shot Reversing Explorations

I need a bit of help here. Since this thread started, I was worried only the 6561 would be explored. Then Kakemoms came along and has posted electron microscope images of the 6560 as well as optical microscope images. Now, if you look at the die shots catalog on Visual6502.org there are a few versio...
by eslapion
Wed Jan 17, 2018 12:00 pm
Forum: Hardware and Tech
Topic: 40 80 column cards
Replies: 16
Views: 274

Re: 40 80 column cards

sjgray wrote:BTW, Nice meeting you at World of Commodore 2017!

Nice meeting you too! :wink:
by eslapion
Tue Jan 16, 2018 7:46 pm
Forum: Hardware and Tech
Topic: VIC - why 22 Columns?
Replies: 13
Views: 198

Re: VIC - why 22 Columns?

I think I got it now :) I wasn't aware that the VIC I was that old (1977). So knowing its birth date and the timing issues posted above everything makes perfect sense to me now. Thank you! Best regards, Schnurri BTW, the 6567 (from NTSC C64) has exactly double the resolution of the 6560 not because...
by eslapion
Tue Jan 16, 2018 11:08 am
Forum: Hardware and Tech
Topic: VIC - why 22 Columns?
Replies: 13
Views: 198

Re: VIC - why 22 Columns?

Finally the C64 came in 1982 with the 6567/6569 that ran from SDRAM which was cheaper. The 6567/69 ran from Dynamic RAM (DRAM). Synchronous Dynamic RAM (SDRAM) did not exist then. Today, the situation has more or less reversed. Static RAM is easier to use and very cheap for small systems. The C64 R...
by eslapion
Mon Jan 15, 2018 1:24 pm
Forum: Hardware and Tech
Topic: 40 80 column cards
Replies: 16
Views: 274

Re: 40 80 column cards

It looks lke Eslapion's ram expander uses one 32K chip and a single LS'08... Yes. The Ultimate Expander used a 62256 SRAM IC or equivalent and a 74LS08. Since the BLK 1,2,3 and 5 areas represent 8kBytes each, it is required to re-encode these signals for compatibility with a single 32kBytes memory ...
by eslapion
Sat Jan 13, 2018 4:42 pm
Forum: Hardware and Tech
Topic: 40 80 column cards
Replies: 16
Views: 274

Re: 40 80 column cards

Eslapion, I sorry but I cannot understand if this is really actually easy to replicate or if It's a long and tedious job to make the circuit board :) Imagine when teachers punished naughty school kids with having to rewrite the same sentence 200 times. It's not 'complicated'. It's long and tedious....
by eslapion
Fri Jan 12, 2018 4:09 pm
Forum: Hardware and Tech
Topic: 40 80 column cards
Replies: 16
Views: 274

Re: 40 80 column cards

I always wondered why it was never cloned. IMO, there would be a fair amount of people who'd be interested in this. Including myself, of course :) For one thing, the ROMs have an inverted chip select pin. Until I figured that one out, I wasn't able to dump their content. Now that I have them, this ...
by eslapion
Fri Jan 12, 2018 3:01 pm
Forum: Hardware and Tech
Topic: 40 80 column cards
Replies: 16
Views: 274

Re: 40 80 column cards

cobracon wrote:Has anyone made a modern 40 80 card? Imagine bbs's in 80 column mode. or irc ,rss. Makes me foam at the mouth ;)

No, but I have the Protecto 80. I would know how to clone it but it was a better investment in time to make PLAnktons and TOLBs.

The Protecto 80 is actually easy to replicate.

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