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#26 2017-01-28 23:16:57

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 931
Website

Re: Cloning the Daystar PDS Adapters for the IIsi and SE/30 - Take 2

Sure, send me what you. Red and I can put it up. Have you ever used Dropbox? Could be handy here.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#27 2017-01-29 02:38:33

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,376

Re: Cloning the Daystar PDS Adapters for the IIsi and SE/30 - Take 2

I'm almost positive  .  . .  make that positive that Dropbox will be filtered out at work, it's this one:

http://dec8.info/Apple/How_the_Macintos … Byte88.pdf

Many thanks for that great PowerCache card! I was wondering why they made one that only ran at 16MHz. roll

Have your heard from herr braun?

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#28 2017-01-30 02:03:31

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,376

Re: Cloning the Daystar PDS Adapters for the IIsi and SE/30 - Take 2

joethezombie wrote:
joethezombie wrote:

... The Artmix card has some pretty high resolution pictures of it online, so I was able to see the part number for that example, GAL16V8D-15LP (data sheet).

Pin 1 - CLK
Pins 2-9 Input
Pin 10 GND
Pin 11 /OE
Pins 12-19 I/O
Pin 20 - VCC

Easiest thing to check first is if Pin1 on that PAL is connected to PDS 38A or 38C.  That would at least confirm the timing source.

So I was thinking about this again, and here are some more thoughts:

So if you look closely at the photos posted on Flickr, we can make out the traces of the active component.

The top right pin looks to go through a resistor, then to the PDS connector A38, which is the CPUCLK signal.  My guess the signal is too "hot" to go directly to the active chip, so it passes through a resistor firstly.  But more importantly, it lets us know the orientation of the chip, so that pin 1 is the top right (on the solder side) of that picture.

I took a look and then did a double take at that card. I looks for all the world to me that he reverse engineered the DayStar TwinSlot Adapter for the IIsi, maybe not, dunno, but that's the direction I've already been heading:
post-902-0-97963600-1484239555.jpg
post-902-0-32793300-1485740398.jpg
I haven't gotten very far with that card because nobody has volunteered to take pictures of theirs, much less offered to buzz connections when I've begged.

When I get the Macs II and IIx adapter boards depopulated and scanned we'll be in business. Developing a block diagram/schematic from the traces should be easy enough. I'm especially curious about the Macintosh II adapter with its discrete communication lines to the well documented CPU and PMMU from Motorola. It's sooooo much better than trying to make sense out of schematics developed from Apple's blasted ASICs! big_smile

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#29 2017-01-30 03:25:31

joethezombie
Member
From: Idaho
Registered: 2015-08-20
Posts: 18

Re: Cloning the Daystar PDS Adapters for the IIsi and SE/30 - Take 2

jt wrote:

I took a look and then did a double take at that card. I looks for all the world to me that he reverse engineered the DayStar TwinSlot Adapter for the IIsi, maybe not, dunno, but that's the direction I've already been heading:

Trash, take a look at this post over at 68kmla:
https://68kmla.org/forums/index.php?/to … s-finding/

Particularly at image #2, it shows the Diimo version of the cache adapter.  The Artmix card is clearly a duplicate of the Diimo version.


Apple: ][+, //c, IIgs, 128K, SE, SE/30, IIfx, IIsi, Q700, MacTV, 6100 DOS, 8100/110, G3 AiO, ANS700/200,G4 DP500
Commodore: 64, 128D, Amiga 3000

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#30 2017-01-30 14:32:03

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,376

Re: Cloning the Daystar PDS Adapters for the IIsi and SE/30 - Take 2

Ha! Methinks my emphasis on taking a "clean room" approach to the ARTMIX adapter just went by the wayside. wink I don't want to know anything about the chip's contents, but the traces are definitely fair game. smile

That's a great component side pic of the traces on both adapters!

post-5199-0-44767300-1445534749.jpg

< runs off to play in Illustrator >

Last edited by jt (2017-01-30 14:38:21)

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#31 2017-01-30 15:21:12

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,376

Re: Cloning the Daystar PDS Adapters for the IIsi and SE/30 - Take 2

First impression of the ARTMIX board under close scrutiny appears to show one of the "adapted" lines heading to and from the Addressing Section of the Accelerator Slot and the Control Line section of the PDS Passthru.

Pullup resistors just hit my radar screen big time.

Could flipping a single bit in the addressing setup take Cache Operations out of conflict with the SE/30's memory mapping of its PseudoSlot $E Video Subsystem? HRMMM????? neutral


Many thanks, jz, you've been most helpful in this Quixotic Quest.





edit: come to think of it, just how much of the memory space dedicated to Slot $E could a 342 x 512 1-bit Compact Mac Video Subsystem possibly address? Given that the 128K managed to do it, not very much at all! A one bit bump might do the trick easily. smile

Last edited by jt (2017-01-30 15:55:40)

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#32 2017-01-31 17:49:02

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,376

Re: Cloning the Daystar PDS Adapters for the IIsi and SE/30 - Take 2

post-902-0-53097100-1485883247.jpg

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#33 2017-02-01 02:40:09

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,376

Re: Cloning the Daystar PDS Adapters for the IIsi and SE/30 - Take 2

Major upgrade of TwinSlot IIsi project over at the MLA:

https://68kmla.org/forums/index.php?/to … g-project/

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#34 2017-02-12 23:24:44

MacOS Plus
Member
Registered: 2015-12-09
Posts: 89

Re: Cloning the Daystar PDS Adapters for the IIsi and SE/30 - Take 2

Wondering if you had all the information from this book just listed on eBay:

1988 Macintosh Family Hardware Reference 128K Mac II Mac Plus Mac SE Schematics

Seems like a neat thing to have anyway.

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#35 2017-02-13 00:28:51

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,376

Re: Cloning the Daystar PDS Adapters for the IIsi and SE/30 - Take 2

It is! But don't buy that one eBay. It would seem some folks buy Macintosh Tomes from the used book channels I shop to mark 'em up quite a bit listing them on eBay.

If it really had the schematics listed, I'd definitely want it, they're missing from my copy. I'll be generous and say the seller mistook the schematics of bits and pieces of those systems as something of far greater value.

If you'd like to get started with Macintosh Family research, start where I did  .  .  .   well, maybe not ordering it at Barne's and Noble on Sixth back in the Nineties after I could no longer peruse it on the shelves., but search for "Guide to the Macintosh Family Hardware." The Second Edition was my intro to all things officially MacTechnical and is fairly commonly referred to as GttMFH2e.***

When the book in the auction was current, I was devouring the pages in Computer Shopper learning everything I could about CatMac projects which later became known as the Hackintosh. Back in the day it was quite an achievement in hardware hacking to build a Hackintosh. Now the use of that once proud title has sunk to the level of referring to some software flippancy or other that was a real achievement only for the first one to do any given model and then share it with the rest of the unwashed masses.

big_smile Me loves soapboxes!




***His Coryness detests my naming conventions, but they ofttimes stick, HEH!

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