As mentioned in other threads we have been experimenting with an FPGA board for the H4 to replace the three original MMU, GLUE and BLITTER chips. As part of this all three PLCC sockets on the H4 would need to be replaced with headers to be able to plug the board in, see locations of chips in red that would need replacing.
To enable the H4 to go back to stock we have first designed a plug in board that would have sockets for the original three chips. The board currently looks like this.
I am currently working not the H4 FPGA board and will update on this thread soon.
H4 FPGA Board
Re: H4 FPGA Board
The Three Amigos arrived today. This board is really if you want to use your H4 as a DEV / Test board for the FPGA board. It will enable you to put back in place the original BLITTER, GLUE & MMU. Once you go down this route your PSU won't sit nicely in its intended location.
Possibly now is the time to build my second H4 specifically for this purpose.
Possibly now is the time to build my second H4 specifically for this purpose.
Re: H4 FPGA Board
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: H4 FPGA Board
Also looks like it might foul on a Falcon RAM card if one were installed...?
Re: H4 FPGA Board
Good job I got those extra Simms then
Does look good @Icky , will he looking forward to seeing it in action.
Does look good @Icky , will he looking forward to seeing it in action.
If it ain't broke, test it to Destruction.
- rubber_jonnie
- Site Admin
- Posts: 10467
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: H4 FPGA Board
Awesome, looking forward to seeing more progress
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Re: H4 FPGA Board
@Icky Fair enough - at least that helps me decide how I want to populate my second H4...though fortunately the part-built one has the SIMM and PLCC sockets for those custom chips already
Re: H4 FPGA Board
Board has been built. Now I need to build the H4 to go round it.
Re: H4 FPGA Board
Looking good . cool name as always
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.