MONGREL EDITION (version 2)

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RTC thoughts

Last post by exxos « Tue Dec 18, 2018 3:59 pm
Replies: 13
by exxos » Sun Dec 16, 2018 11:39 am
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I've had it in mind for a while to use my RTC modules ( falcon) on the next board. The problem is it will need a pld to take care of the address...
13 Replies

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Last post by exxos
Tue Dec 18, 2018 3:59 pm
EXPANSION HEADERS REV H1

Last post by IngoQ « Fri Dec 14, 2018 3:32 pm
Replies: 6
by exxos » Fri Dec 14, 2018 11:06 am

As mentioned before, the first expansion header will be the return of the DIP 68000 socket. The board can use either a PLCC CPU or DIP CPU.

The...

6 Replies

46 Views

Last post by IngoQ
Fri Dec 14, 2018 3:32 pm
RAM change to simm ?

Last post by PaulJ « Fri Dec 14, 2018 2:24 pm
Replies: 13
by exxos » Fri Dec 14, 2018 11:12 am
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As mentioned *somewhere* I talked about ditching the Falcon RAM boards in place for a 72pin simm socket instead. I am personally leaning towards that...
13 Replies

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Last post by PaulJ
Fri Dec 14, 2018 2:24 pm
POWER CONNECTORS

Last post by tzok « Thu Dec 13, 2018 9:44 pm
Replies: 17
by exxos » Tue Dec 11, 2018 9:48 pm
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What format do people want these ? There is the PSU connector pinout, or the floppy header pinout... Assume just more floppy power pinouts is what...
17 Replies

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Last post by tzok
Thu Dec 13, 2018 9:44 pm
MONO SWITCH

Last post by exxos « Thu Dec 13, 2018 7:38 pm

by exxos » Thu Dec 13, 2018 7:38 pm

What this basically does is switch the RGB digital shifter outputs with the shifter MONO output via a multiplexer chips. Basically a simple UBE...

0 Replies

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Last post by exxos
Thu Dec 13, 2018 7:38 pm
DMA HEADER REV H1

Last post by exxos « Thu Dec 13, 2018 4:37 pm

by exxos » Thu Dec 13, 2018 4:37 pm

Added the internal DMA header.. As to if Atari's pin numbering matches the numbering in my schematic is another matter! Will try and verify on a real...

0 Replies

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Last post by exxos
Thu Dec 13, 2018 4:37 pm
SMT capacitors

Last post by exxos « Wed Dec 12, 2018 3:24 pm

by exxos » Wed Dec 12, 2018 3:24 pm

As long as it doesn't annoy people to much.. I plan the replace the decoupling caps (leaded) with SMT ones..

Reason is mostly to declutter the...

0 Replies

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Last post by exxos
Wed Dec 12, 2018 3:24 pm
RGB DAC ADDED

Last post by exxos « Tue Dec 11, 2018 10:43 pm

by exxos » Tue Dec 11, 2018 10:43 pm

Before...

sh1.JPG

After...

vd.JPG

I guess something to ponder next is if to add a multiplexer to switch MONO to the RGB buffers...

0 Replies

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Last post by exxos
Tue Dec 11, 2018 10:43 pm
RESET CIRCUIT

Last post by exxos « Tue Dec 11, 2018 10:19 pm

by exxos » Tue Dec 11, 2018 10:19 pm

Before..

11.jpg

After :)

22.jpg

Pondering that the /MR should have a pull up on there as well...

EDIT:

pdf says 63K internal pull up.. I...

0 Replies

43 Views

Last post by exxos
Tue Dec 11, 2018 10:19 pm
ROM LS11 CHANGED REV H1

Last post by Forgottenmyname « Tue Dec 11, 2018 9:41 pm
Replies: 1
by exxos » Tue Dec 11, 2018 9:29 pm

I have removed the DIP LS11. The only need one gate here, so I change this for a single gate chip. It is a small SMT single gate one. It will save...

1 Replies

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Last post by Forgottenmyname
Tue Dec 11, 2018 9:41 pm
INVERTER REMOVAL REV H1

Last post by exxos « Tue Dec 11, 2018 9:12 pm

by exxos » Tue Dec 11, 2018 9:12 pm

Image doesn't need high res here, just to show that the inverters at the bottom of the image are ones which have now been removed. Which saves a...

0 Replies

34 Views

Last post by exxos
Tue Dec 11, 2018 9:12 pm
REV H DMA / 1772 mods

Last post by exxos « Tue Dec 11, 2018 5:00 pm
Replies: 1
by exxos » Tue Dec 11, 2018 4:46 pm

I started a new schematic , so we on REV H now.

I've added in the 1772 buffers... Though I actually realise we should probably have pullups both...

1 Replies

33 Views

Last post by exxos
Tue Dec 11, 2018 5:00 pm
exxos IDE interface (untested)

Last post by exxos « Sun Dec 09, 2018 9:57 pm
Replies: 21
by exxos » Sun Nov 19, 2017 9:54 pm
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I keep getting asked about adding IDE to my boosters.. well.. This is one circuit I designed months ago.. I just don't have time to build it and test...
21 Replies

1273 Views

Last post by exxos
Sun Dec 09, 2018 9:57 pm
Declaring interest in REV G board.

Last post by IngoQ « Sat Dec 08, 2018 12:55 pm
Replies: 12
by exxos » Fri Dec 07, 2018 7:05 pm
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As mentioned in the other thread some people want to spend of the boards done with all the current fixes. This basically is the REV G board.

Though...
12 Replies

226 Views

Last post by IngoQ
Sat Dec 08, 2018 12:55 pm
The plan... 2018

Last post by IngoQ « Sat Dec 08, 2018 12:46 pm
Replies: 12
by exxos » Fri Dec 07, 2018 11:18 am
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The mongrel edition board is the planned version 2 of the remake board. Now before anyone gets excited, this is probably going to be more like...
12 Replies

212 Views

Last post by IngoQ
Sat Dec 08, 2018 12:46 pm

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MONGREL EDITION (version 2)

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