REV H1 information and interest

Post by **exxos** » Sun Feb 24, 2019 11:34 am

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 viewtopic.php?f=73&t=1475

I will update this thread with more info, I may have forgot to add things....

CHANGES:

All the changes and fixes from the Alpha which generated the REV G design viewtopic.php?f=19&t=1230

DMA / 1772 BUFFER ISOLATOR viewtopic.php?f=73&t=1437
CPU EXPANSION HEADER viewtopic.php?f=73&t=1452
POWER CONNECTORS viewtopic.php?f=73&t=1440
MONO SWITCH (similar to UBE switch) viewtopic.php?f=73&t=1448
SMT CAPACITORS viewtopic.php?f=73&t=1443
RGB DRIVERS REPLACED WITH FALCON DAC viewtopic.php?f=73&t=1442 AND viewtopic.php?f=19&t=1235&start=260#p14851
DMA HEADERS ADDED viewtopic.php?f=73&t=1447 AND viewtopic.php?f=19&t=1289
FMCII RTC ADDED viewtopic.php?f=73&t=1458
RESET CIRCUIT UPDATED viewtopic.php?f=73&t=1441 AND viewtopic.php?f=19&t=1234
LS INVERTERS REMOVED viewtopic.php?f=73&t=1438 ***
RW ADDED TO CARTRIDGE PORT viewtopic.php?f=19&t=1261
DE JUMPERED TO BREAK GLUE TO MMU CONNECTION
ADD 72 PIN SIMM SOCKET viewtopic.php?f=73&t=1453

***A lot of TTL logic was removed in favour for smaller tiny logic gates.

PLANNED / WIP:

AB SWITCH viewtopic.php?f=19&t=1267
IDE viewtopic.php?f=73&t=371

TO DO:
Fix and add various holes into the MB.
Locate and figure out how to mount US internally - (idea abandoned to speed up development).
Still not fixed the reset switch lib.

PEOPLE INTERESTED IN SUPPORTING the REV H1 BUILD

PaulJ X2
kodak80 X4
Icky X2
denni505 X1
chlu600 X2
IngoQ X1
tin X2
Xyla X2
JezC X1
redhawk668 X1
exxos X2
Rubber_jonnie X1
PhilC X3
DoG X1
poobah X1
alienkidmj12 X1
wietze X1
btl (aka Beetle) X1
derkom X1

( Post below if anyone else is interested, might have missed some people already sorry!)

kodak80 · Post by **kodak80** » Sun Feb 24, 2019 12:00 pm

Please update me to x4 for the boards.

PaulJ · Post by **PaulJ** » Sun Feb 24, 2019 3:00 pm

Exxos, what is the minimum number of boards to pull the trigger on this thing? Is it still 40 @ 20 boards? You did miss denni505 on the prior thread. If its still a 20 board minimum we could divid it up and be done with it. Since there's 4 parties listed that's 5 a piece worst case. I'm sure there's others will be interested... RubberJ's always there for a challenge.. not to mention a few others.

Second question, you sent out the video dac cards... was that v2 or v3.. i didn't build it because the output was flawless but will if it will prove anything and move us on. Please advise.

Post by **exxos** » Sun Feb 24, 2019 4:31 pm

I don't remember what versions I sent out... some did the V2 but there was patches, so I did the v3 which is the design I built into the rev H1.. So it needs testing really in case something is wrong.. Otherwise there might be no video output on the H1.

OK to overly simplify all this...

As for "MOQ" , there isn't one. As said with the alpha.. Price gets stupid under 10. So do people want to pay £100 a board, or less.. Quantity goes up and price goes down for everyone. So 10-20 is what I think is a more reasonable cost .

Though as more boards are done, postage goes up, and then import taxes goes go etc so there comes a point where more boards doesn't give further discounts. Its like 20% saving in PCB cost for more done, then 20% import taxes.

I will try and get some prices soon and see what the best value run is.

PaulJ · Post by **PaulJ** » Sun Feb 24, 2019 4:40 pm

exxos wrote: ↑
Sun Feb 24, 2019 4:31 pm
I don't remember what versions I sent out... some did the V2 but there was patches, so I did the v3 which is the design I built into the rev H1.. So it needs testing really in case something is wrong.. Otherwise there might be no video output on the H1.

Exxos, is there a post that talks to the changes between v2 and v3?

denni505 · Post by **denni505** » Sun Feb 24, 2019 4:43 pm

Thanks for the link looks interesting only one board for me thanks

Post by **exxos** » Sun Feb 24, 2019 4:45 pm

PaulJ wrote: ↑
Sun Feb 24, 2019 4:40 pm
Exxos, is there a post that talks to the changes between v2 and v3?

viewtopic.php?f=19&t=1235&start=50#p14107

viewtopic.php?f=19&t=1235&start=250#p14781

chlu600 · Post by **chlu600** » Sun Feb 24, 2019 8:41 pm

Hi,
I'll gladly support another run.
As last time I don't want the actual board.

Have I missed the price?
But I'll support two boards

Post by **IngoQ** » Mon Feb 25, 2019 3:09 pm

Although I am sure my wife will kill me, I am in this time for one board as well

tin · Post by **tin** » Tue Feb 26, 2019 6:10 pm

I’ll chime in and support this run with two boards (waited to long the last time, doh). Also I’d take two component kits (in case there will be any).

Also: big thanks to all the people who helped to make/debug the remake board btw.

REV H1 information and interest

REV H1 information and interest

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