Search found 231 matches

by czietz
Sun May 24, 2020 11:35 am
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Going Gotek - FlashFloppy How To
Replies: 98
Views: 36687

Re: Going Gotek - FlashFloppy How To

AFAIK, you cannot run the .tos file directly from Gotek, it doesn't work that way, however it is possible to get around. There is pretty much only one way I would do this. It doesn't mean there isn't another way, however I find this way to be easy. I'm aware that this thread is about the FlashFlopp...
by czietz
Fri May 22, 2020 11:35 am
Forum: MEMBER BLOGS
Topic: Learning CPLD and testing GALs
Replies: 16
Views: 205

Re: Learning CPLD and testing GALs

BTW: It seems like the most modern software to still support GALs (Lattice ispLEVER Classic) has paid-for licenses (590 USD per year) only. Didn't this use to be free-of-charge? Does Lattice want to "milk" the customers stuck on legacy devices? This also makes their 5V-tolerant CPLDs (mach 4A) very ...
by czietz
Tue May 19, 2020 11:44 am
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge keys and emulation
Replies: 67
Views: 1280

Re: Steinberg Avalon cartridge

Yeah I'm doing it purely for the challenge. Helping out with archiving for posterity is a bonus. I'll shell out the money if needed. Ok, since I cannot actually do it (for lack of a dongle [1]), here is what I would do. Maybe it can help you. 1. Capture the access pattern to the dongle (input pins,...
by czietz
Tue May 19, 2020 7:09 am
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge keys and emulation
Replies: 67
Views: 1280

Re: Steinberg Avalon cartridge

Just a hickup, but irritating. It does give me some incentive to in addition to emulator support also try to produce either a working GAL16V8 replacement or, if the equations cannot be reversed from the data, some MCU based hw clone. Having already successfully reverse-engineered the equations of a...
by czietz
Sun May 17, 2020 9:56 am
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge keys and emulation
Replies: 67
Views: 1280

Re: Steinberg Avalon cartridge

beel1 : BTW, considering what you wrote in the AF thread... 1. The PAL is clocked by the UDS signal, which toggles even if there is no activity on the cartridge port, inputing address bus data to the PAL [...] But what I found during my experiments with Synthworks dongle almost 2 years ago is that ...
by czietz
Sun May 17, 2020 9:10 am
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge keys and emulation
Replies: 67
Views: 1280

Re: Steinberg Avalon cartridge

A PAL16R8 has no internal (hidden) registers. All registers are observable on the respective output pins if you force /OE to low. So you can know what is fed back into the logic array. Still, it is not straightforward to brute-force by applying all possible inputs, simply because you cannot directly...
by czietz
Sun May 17, 2020 7:59 am
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge keys and emulation
Replies: 67
Views: 1280

Re: Steinberg Avalon cartridge

Not sure I follow. The only inputs to your logic are the 8 input pins and the 8 output pins. All of them are visible/known. Yes, the outputs are visible (fortunately). But you cannot directly control them. To reverse-engineer the logic equations by minimization you need to exercise all input terms....
by czietz
Sat May 16, 2020 9:55 pm
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge keys and emulation
Replies: 67
Views: 1280

Re: Steinberg Avalon cartridge

Having reverse-engineered (and subsequently bug-fixed) the PAL in an Atari SH204 host adapter, obviously I would start with "brute force", too. If it was a combinatorial PAL, the equations could be extracted by applying all possible inputs and minimizing the resulting outputs using something like Es...
by czietz
Wed May 13, 2020 5:14 pm
Forum: ROM UPGRADES
Topic: Setting Up a dual boot rom
Replies: 55
Views: 650

Re: Setting Up a dual boot rom

exxos The TOS 1.04 image I patched for IDE was from a ROM I bought from you When you say you patched it for IDE, did you use https://github.com/czietz/ideboot/? If so, there's no ppera code involved -- at least for the IDE patch. The IDE patch is under the free MIT license and for the rest of TOS, ...
by czietz
Wed May 13, 2020 1:42 pm
Forum: PSU (power supplies)
Topic: How to: recapping the Mega STe power supply
Replies: 68
Views: 12617

Re: How to: recapping the Mega STe power supply

Just digging through my photos and found the cut track board. That saved me opening the machines back up again. It's maybe worth noting that the cut also "only" breaks a loop but doesn't fully disconnect something from something else: psm5341_cut.JPG This connection isn't even there in the first pl...

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