MONGREL EDITION (version 2)

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REV H1 information and interest

Last post by PaulJ « Wed Apr 03, 2019 9:00 pm
Replies: 21
by exxos » Sun Feb 24, 2019 11:34 am
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The H1 is the current board which I am looking to get made later in the year if there is enough interest..

The H1 schematic is here

I will update...
21 Replies

565 Views

Last post by PaulJ
Wed Apr 03, 2019 9:00 pm
exxos IDE interface (untested)

Last post by exxos « Sun Apr 21, 2019 10:44 pm
Replies: 112
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...
112 Replies

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Last post by exxos
Sun Apr 21, 2019 10:44 pm
ST-IDE-ROM Dev Board v1 - BETA Testers

Last post by rubber_jonnie « Thu Apr 18, 2019 8:45 am
Replies: 277
by Icky » Thu Feb 28, 2019 7:49 am
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IMG_3616.jpg

As discussed in the other thread exxos - IDE interface (untested)

We are looking for a few BETA testers to help run these DEV...
277 Replies

3556 Views

Last post by rubber_jonnie
Thu Apr 18, 2019 8:45 am
Flashy Clock - Yet another DEV board

Last post by Icky « Fri Apr 12, 2019 7:50 pm
Replies: 9
by Icky » Wed Mar 20, 2019 9:36 pm

Exxos and I had been discussing repurposing the IDE DEV board design into a new DEV board that we can test Flash ROM and Exxos' Falcon RTC module....

9 Replies

227 Views

Last post by Icky
Fri Apr 12, 2019 7:50 pm
3V <> 5 V thoughts

Last post by exxos « Sat Mar 23, 2019 8:26 pm

by exxos » Sat Mar 23, 2019 8:26 pm

I was half thinking if the CPU bus pullups were on 3.3V rail then the CPU would actually still run on 5V, but all the IO's would be on 3.3V. So it...

0 Replies

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Last post by exxos
Sat Mar 23, 2019 8:26 pm
16MHz mod & current thoughts

Last post by PhilC « Sun Mar 17, 2019 12:39 pm
Replies: 1
by exxos » Sun Mar 17, 2019 12:28 pm

While the Alpha needs testing with the 16MHz mod, The problem is its really needing the later SMT M MU & GLUE as they should stand better for...

1 Replies

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Last post by PhilC
Sun Mar 17, 2019 12:39 pm
TESTED IDE CF SD CARDS

Last post by exxos « Fri Mar 08, 2019 9:11 pm

by exxos » Fri Mar 08, 2019 9:11 pm

My tested cards on the IDE interface in testing...

cf.jpg

Also tried IDE to SD adapter with sandisk ultra.

sd.jpg

Also tried a brick...

0 Replies

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Last post by exxos
Fri Mar 08, 2019 9:11 pm
Declaring interest in REV G board ( abandoned see REV H1)

Last post by exxos « Sun Feb 24, 2019 11:16 am
Replies: 25
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...
25 Replies

1131 Views

Last post by exxos
Sun Feb 24, 2019 11:16 am
RAM change to simm ?

Last post by exxos « Sun Feb 24, 2019 1:40 am
Replies: 14
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...
14 Replies

658 Views

Last post by exxos
Sun Feb 24, 2019 1:40 am
DMA HEADER REV H1

Last post by exxos « Mon Dec 24, 2018 3:10 pm
Replies: 27
by exxos » Thu Dec 13, 2018 4:37 pm
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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...
27 Replies

2144 Views

Last post by exxos
Mon Dec 24, 2018 3:10 pm
H1 SCHEMATIC 20/12/2018

Last post by PaulJ « Fri Dec 21, 2018 5:57 pm
Replies: 7
by exxos » Thu Dec 20, 2018 8:58 pm

H1.png

Zipped..
H1.zip

This is the current revision of the schematic.

Things to add yet is the 1772 GAL (for AB switch & 16MHz floppy...

7 Replies

683 Views

Last post by PaulJ
Fri Dec 21, 2018 5:57 pm
RTC thoughts

Last post by rubber_jonnie « Tue Dec 18, 2018 5:29 pm
Replies: 14
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...
14 Replies

902 Views

Last post by rubber_jonnie
Tue Dec 18, 2018 5:29 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

360 Views

Last post by IngoQ
Fri Dec 14, 2018 3:32 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

828 Views

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

284 Views

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

280 Views

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

283 Views

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

256 Views

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

Last post by PhilC « 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

203 Views

Last post by PhilC
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

237 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

209 Views

Last post by exxos
Tue Dec 11, 2018 5:00 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

682 Views

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

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MONGREL EDITION (version 2)

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