C64 Reloaded

Disk drives, Monitors, SuperCPU etc.
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eslapion
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Re: C64 Reloaded

Post by eslapion »

dudz wrote:its just an ordinary drive RAM expansion, what there to "design" anyway? next to parallel cables that must be the one thing everyone build themselves :)
It's always simple when you're ignorant...

Recently I created a small 32k RAM expansion board for a standard 1541 and its more complex than it seems because the ROMs are mirrored all over the upper half of the address range and the built-in 2k RAM and VIAs are mirrored all over the lower half. You have to create an architecture which fools the 1541 board into receiving a fake address when the CPU addresses the RAM.


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Re: C64 Reloaded

Post by ckoba »

eslapion wrote:Now that is VERY interesting, by all means please tell me more!!

Drew clearly showed he is a hardware nincompoop in the Atmel PLA thread... you know where...

I know of the RAMBOards from Chip Level Design but I didn't know people at SSI were involved in similar stuff.
Not much to tell, and my memory is a bit spotty on thirty-year-old events. SSI was the reseller/publisher in the Pacific Northwest for a lot of companies; they definitely sold the RAMBO because I purchased a few at their shop in (Vancouver? Longview? Somewhere very near Portland, anyway).

The bad blood between the PNW Commodore community and Drew went back much, much further than people think. Megasoft was a post-office box in Battleground, WA (not a long way from SSI, actually). They resold/published crap software and books, and it was not unknown for shipping delays of one year plus.

When deprotection "parameters" (actually small BASIC programs that removed protection checks from copies) started to be a thing, SSI would sell disks containing about ten or so for a few dollars in their store. Many of these parameters later found their way into Megasoft/UU products -- rearranged so that they would look different, but the same deprotection scheme.

Drew claimed that he spent a lot of time at SSI and they learned everything about deprotecting from him. Hogwash, according to the SSI guy I dealt with back in the day (and I wish I could remember his name).

There was also a rumor going around that Drew was not a mere Megasoft employee, but in fact had a significant chunk of equity in the place ... and that equity followed when they rebranded to UU and moved to Lake Havasu to avoid a lawsuit or three. I don't know if that was actually the case, but that's what was being said -- that Drew *was* Megasoft.

That's about it, I think. I dropped out of the Commodore scene about the same time that Drew started his Amiga vaporware projects, so I don't know much past that.
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Re: C64 Reloaded

Post by Gonzo »

eslapion wrote:
dudz wrote:its just an ordinary drive RAM expansion, what there to "design" anyway? next to parallel cables that must be the one thing everyone build themselves :)
It's always simple when you're ignorant...

Recently I created a small 32k RAM expansion board for a standard 1541 and its more complex than it seems because the ROMs are mirrored all over the upper half of the address range and the built-in 2k RAM and VIAs are mirrored all over the lower half. You have to create an architecture which fools the 1541 board into receiving a fake address when the CPU addresses the RAM.
I missed the part where he said anything about 32 KB - 8 KB was the norm. DIY expansions didn't have to be user-friendly either. Look here: http://www.baltissen.org/newhtm/ram1541.htm - you can easily adjust that for 8 KB. If you don't mind RAM mirroring you can skip some steps.
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Re: C64 Reloaded

Post by eslapion »

Gonzo wrote:I missed the part where he said anything about 32 KB - 8 KB was the norm.
He didn't... Did he have to?

Making a RAM expansion for a 1541 is pretty much the same amount of trouble with 8k or 32k... I just disagree with his (Dudz) point of view and I happend to have made such an expansion so I think I know what I am talking about.
DIY expansions didn't have to be user-friendly either. Look here: http://www.baltissen.org/newhtm/ram1541.htm - you can easily adjust that for 8 KB. If you don't mind RAM mirroring you can skip some steps.
1. It's not that simple

2. This explanation doesn't include any schematics or photos - not exactly user-friendly

Are you saying you agree with...
its just an ordinary drive RAM expansion, what there to "design" anyway? next to parallel cables that must be the one thing everyone build themselves
Cuz I don't...
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Re: C64 Reloaded

Post by zap »

I've never built a drive RAM expansion but then i am not just anyone. :) A C64 reloaded on eBay is currently bidding at $660AU....
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Re: C64 Reloaded

Post by dudz »

This explanation doesn't include any schematics or photos - not exactly user-friendly
in the good old days people still could use their brains and didnt need to have everything spoon fed and a youtube tutorial to go with it. and really, wiring up a memory chip to the bus is not hard. no really.
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Re: C64 Reloaded

Post by eslapion »

dudz wrote:in the good old days people still could use their brains and didnt need to have everything spoon fed and a youtube tutorial to go with it. and really, wiring up a memory chip to the bus is not hard. no really.
In the good old days you could make the difference between a half-ass basement hardware hobbyist and a serious company by the quality of the literature available with a product.

Also, the fact you mention wiring up a memory chip to the bus clearly shows you've got no clue what you're talking about - in the 1541 if you do that then there will be a bus conflict between the RAM you've added and the ROM chips which are mirrored all over the addresses above $8000 or with the VIAs which all mirrored every 8k below $7FFF.

Please spare us all the "I know everything but I do nothing" speech.

You must add the logic circuits to create a fake address and I'm sure you've got no clue how to do that. I did it.
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Re: C64 Reloaded

Post by zap »

I know as i read on multiple forums you need to add some glue logic to interface the ram to the bus, however that just gets messy, i guess my UHO glue is to low tech and the salesman at glues'r'us have no clue either, no help at all. Also where does the mirrors go pictures would be great google let me down here. Your dreaming on the price! $8000 seems a bit steep and $7FFF must be some foreign money? i can't seem to find a converter for that anywhere. Depending on the price of the RAM, GLUE and Mirrors $35 maybe get a grip.
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Re: C64 Reloaded

Post by eslapion »

zap wrote:Your dreaming on the price! $8000 seems a bit steep and $7FFF must be some foreign money? i can't seem to find a converter for that anywhere.
Let me help you...

http://www.binaryhexconverter.com/hex-t ... -converter

I have no clue if you're serious or joking but either way your post is funny as hell!!
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Re: C64 Reloaded

Post by Gonzo »

eslapion wrote: Also, the fact you mention wiring up a memory chip to the bus clearly shows you've got no clue what you're talking about - in the 1541 if you do that then there will be a bus conflict between the RAM you've added and the ROM chips which are mirrored all over the addresses above $8000 or with the VIAs which all mirrored every 8k below $7FFF.
Are you saying chip select signals are now part of address bus? WRONG!

Ruud's instructions clearly say
The I/O and original SRAM are selected using a 74LS42. address lines A14 and A13 aren't used in this process and that is what we are going to change by adding a 74LS139.
And that's exactly what people did when they still could think with their own brains. It's not rocket science, but you make it sound like it is.
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