exxos IDE interface (untested)

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Re: exxos IDE interface (untested)

Post by exxos » Sun Dec 02, 2018 10:46 pm

Forgottenmyname wrote:
Sun Dec 02, 2018 10:38 pm
Which atmel pld are you planning to use? I really should start looking at stuff like that, fpgas etc.
ATF1508 mostly. ATF1504 is a bit cheaper but less gates.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: exxos IDE interface (untested)

Post by PhilC » Sun Dec 02, 2018 11:00 pm

Would definitely need an LA if I started with PLDs then.

Will keep that one on the back burner for now but got the programmers etc already.
If it ain't broke, test it to Destruction.

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Re: exxos IDE interface (untested)

Post by exxos » Mon Dec 03, 2018 12:09 am

ATF15xx series needs its own special programmer.

The good thing about them is they 5v, and the software is suioer simple. Its almost like notepad with a compiler :lol: none of this 30gb bloatware rubbish. I like the altera software, but takes more getting used to. I've only used itnoince and that was like a year ago. But at least its not to bad to get going with. Really just want to stick to simple chips until I have need to go bigger. Hard to keep everything in my head all at once :roll:
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: exxos IDE interface (untested)

Post by tuxie » Mon Dec 03, 2018 11:59 am

but 2 pairs of bus drivers on it, one pair in byte swapped mode and one pair in non swapped mode. Then you can switch between this both pair depend on what happens on the bus. If its a command access then use the non swapped pair and if its a data transfer then swap it (works in thunder and soon in lightning ST too)

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Re: exxos IDE interface (untested)

Post by exxos » Mon Dec 03, 2018 12:04 pm

Yeah, could route it all though a larger PLD as well I guess, or like you say, bus drivers.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: exxos IDE interface (untested)

Post by tuxie » Mon Dec 03, 2018 12:36 pm

We use a xilinx cpld and rout all data lines through this but you need a large one. Maybe you can use a simple AND or a OR gate to compine Addresslines to save in/outputs of the cpld!

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Re: exxos IDE interface (untested)

Post by exxos » Tue Dec 04, 2018 9:39 pm

tuxie wrote:
Mon Dec 03, 2018 12:36 pm
We use a xilinx cpld and rout all data lines through this but you need a large one. Maybe you can use a simple AND or a OR gate to compine Addresslines to save in/outputs of the cpld!
Possible I guess.. I already have the address bus routed to the SEC PLD, the control lines should fit.. not sure about the databus... I will probably just use a second PLD for the whole IDE circuit.. makes life a bit easier as the PLD on the booster is pretty cramped already. Saying that its only the databus inversion which is the issue really. As you say, 2 pairs of bus drivers is all it really needs.. Bit early days yet anyway.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: exxos IDE interface (untested)

Post by Icky » Sun Dec 09, 2018 2:39 pm

A few steps forward over the last few days. Working with Exxos have reverted to using some GALs to reduce the many logic chips.

Cartridge Port Breakout board is read to work with breadboard. This helps to get most of the data lines and address lines out.

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Re: exxos IDE interface (untested)

Post by exxos » Sun Dec 09, 2018 3:23 pm

:bravo: one step closer :thumbup:
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: exxos IDE interface (untested)

Post by Icky » Sun Dec 09, 2018 8:28 pm

A few more steps forward.

Still a bit more to do
  • Tying several pins down to ground
  • Adding in all the extra lines back to the ST
  • Checking everything out
A big mess-o-wires

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