MONGREL EDITION (version 2)

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REV H1 information and interest

Last post by derkom « Thu Jul 25, 2019 4:17 pm
Replies: 67
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...
67 Replies

4372 Views

Last post by derkom
Thu Jul 25, 2019 4:17 pm
Assembled H2 interest ?

Last post by exxos « Sun Jul 21, 2019 10:04 am
Replies: 5
by exxos » Thu Jul 18, 2019 9:20 pm

I have started a new thread for this to see what people's thoughts on this are as I think the post went unnoticed before..

Basically as I will be...

5 Replies

260 Views

Last post by exxos
Sun Jul 21, 2019 10:04 am
Trudie - The Next IDE Board

Last post by exxos « Sun Aug 11, 2019 5:35 pm
Replies: 38
by Icky » Fri Jul 19, 2019 8:20 pm
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Welcome to Trudie the next IDE board.

Apologies Exxos and I seem to have started naming boards (wonder if you have spotted the other names out...
38 Replies

1600 Views

Last post by exxos
Sun Aug 11, 2019 5:35 pm
Flashy Clock - Yet another DEV board

Last post by PaulJ « Mon Aug 05, 2019 3:12 am
Replies: 84
by Icky » Wed Mar 20, 2019 9:36 pm
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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....
84 Replies

3310 Views

Last post by PaulJ
Mon Aug 05, 2019 3:12 am
H2C SCHEMATIC 19-07-2019

Last post by PaulJ « Fri Jul 26, 2019 4:52 pm
Replies: 18
by exxos » Fri Jul 19, 2019 7:42 pm
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Once upon a time.. there was a motherboard.. and it grew a bit...

H2C.jpg

H2C.jpg

600 DPI SCH
h2c.zip
18 Replies

510 Views

Last post by PaulJ
Fri Jul 26, 2019 4:52 pm
MONO SWITCH

Last post by ube « Sun Jul 21, 2019 3:03 pm
Replies: 3
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...

3 Replies

601 Views

Last post by ube
Sun Jul 21, 2019 3:03 pm
ST-IDE-ROM Dev Board v1 - BETA Testers

Last post by Icky « Sat Jul 13, 2019 11:15 am
Replies: 433
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...
433 Replies

15013 Views

Last post by Icky
Sat Jul 13, 2019 11:15 am
Current 16MHz & FPGA plotting

Last post by exxos « Fri Jul 12, 2019 9:40 pm
Replies: 1
by exxos » Fri Jul 12, 2019 9:11 pm

I have removed the 74F04 buffer chip and have started breaking up the clock lines with the intention of creating a new 16MHz mod board which will...

1 Replies

138 Views

Last post by exxos
Fri Jul 12, 2019 9:40 pm
True 16MHz Mode

Last post by Icky « Wed Jul 10, 2019 11:39 pm
Replies: 111
by Icky » Wed May 01, 2019 11:35 pm
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Exxos and I have been discussing boosting the STF Remake. In his grand plan the remake is designed so that we can run the ST in what I like to call...
111 Replies

7185 Views

Last post by Icky
Wed Jul 10, 2019 11:39 pm
ALPHA CPU Extension Board - Yes Another Tower

Last post by Icky « Sat Jun 15, 2019 11:03 am
Replies: 20
by Icky » Tue May 07, 2019 8:12 pm
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To continue the testing and development of the STF Remake Exxos and I have been discussing a CPU extension board to go on the STF to help test...
20 Replies

1268 Views

Last post by Icky
Sat Jun 15, 2019 11:03 am
Clocking

Last post by ijor « Thu Jun 06, 2019 2:53 pm
Replies: 6
by ijor » Wed Jun 05, 2019 8:05 pm

Quoting from a different subforum, but probably better to follow up here:

In terms of clock distribution and division, on the remake board, we...

6 Replies

361 Views

Last post by ijor
Thu Jun 06, 2019 2:53 pm
16MHz Mod PCB install

Last post by Icky « Mon Jun 03, 2019 6:53 pm
Replies: 10
by exxos » Fri May 31, 2019 9:47 pm
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I started a new thread for the install of the Alpha mod PCB..

STEP 1

Cut the DE track as shown below...

Solder a wire approx 4 as shown below....
10 Replies

610 Views

Last post by Icky
Mon Jun 03, 2019 6:53 pm
ALPHA CPU Quattro Board

Last post by exxos « Fri May 24, 2019 1:45 pm
Replies: 13
by Icky » Fri May 10, 2019 10:10 am
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If you have been following exxos' threads on the H2 board and the ALPHA 16MHz Mode you will of noticed that a few boards have been springing up to...
13 Replies

915 Views

Last post by exxos
Fri May 24, 2019 1:45 pm
SMT MMU & GLUE dilemma

Last post by exxos « Thu May 16, 2019 7:03 pm
Replies: 6
by exxos » Thu May 09, 2019 9:22 pm

PLCC vs SMT:

The mongrel board was basically going to have the SMT MMU & GLUE rather than the PLCC chips... I have about 80 of each of those SMT...

6 Replies

434 Views

Last post by exxos
Thu May 16, 2019 7:03 pm
exxos IDE interface (untested)

Last post by displaced « Sun May 12, 2019 8:40 pm
Replies: 115
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...
115 Replies

10248 Views

Last post by displaced
Sun May 12, 2019 8:40 pm
TESTED IDE CF SD CARDS

Last post by PaulJ « Sun Apr 28, 2019 6:20 pm
Replies: 11
by exxos » Fri Mar 08, 2019 9:11 pm
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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...
11 Replies

733 Views

Last post by PaulJ
Sun Apr 28, 2019 6:20 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

289 Views

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

304 Views

Last post by PhilC
Sun Mar 17, 2019 12:39 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

2184 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

1354 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

3335 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

1103 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

1556 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

697 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

1578 Views

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

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MONGREL EDITION (version 2)

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