Some small news on the boosters as I have not posted anything for a while. It just to let people know current status. V1 BOOSTER
I am going to keep selling these at the same price as they are for now. I plan to build up a new batch as soon, Though likely once this last batch is done I will discontinue them. This booster is good enough for people who just want a boost in games rather than boosting GEM/TOS. Of course GEM does get a boost in speed anyway, but of course not as much as TOS running at 16mhz. So if anyone wants to grab one of these lower cost boosters then they should do fairly soon. V1.5 BOOSTER
Is 99% completed. The hold up against it going on sale is I have noticed a reset line problem on some motherboards. The V1.5 uses the reset line to clear the flipflop (though not necessary really) though I noticed some random crashes on the V1.5, but turned out it was down to the reset line generated on the motherboard. When I checked this on my scope, one motherboard had about 1V noise, another motherboard had about 2 volt noise. So the signal was randomly floating between 3-5volts. While this is still classed as a logic HI, I suspect when the booster is running in 16mhz speed, it can react to noise on the reset signal and causes the ST to crash. Though I assume at crash point the voltage goes even lower triggering the GAL flipflop to reset and upset the 8/16mhz switching. The booster which GadgetUK had from me, I hard wired the rest line to avoid the problems. Though at this point in time, I need to investigate this reset line problem some more before I start shipping out the boosters. So either the motherboard needs some fix, or I will just avoid using the motherboard reset line. Either way, I need to look into the matter a bit more yet. Aside form the reset line problem the V1.5's are actually ready to ship. Though of course I want to get to the bottom of the reset problem on the motherboard before I start shipping out. V2 BOOSTER
Holger Zimmerman has been kind enough to help solve the /AS isolation problem. I was so close to the solution but never quiet got there
What Holger suggested was using /BG to actually isolate the ST /AS line, before I was isolating it purley on changes to /AS itself. So using BG isolates the signal sooner and solves no end of problems. So currently the V2 is actually working
The hold up on the V2 now is I am trying to get 32mhz working. I had a simple GAL hardwired ontop of a DIP CPU a few months ago and got 32mhz out of it. Though it was running for a few hours then I broke something trying to add 32mhz access to ROM. Though at the time, it was using the iffy V2 code so random problems were expected. Though 32mhz on the V2 itself causes a row of bombs on power up. As to why the V2 isn't working, when my mock test did, I have no idea. I have not had time to spend on this yet as I have been busy working on the 4MB kits, and of course the V1.5 booster. Now I have got distracted with reprogramming gembench, all while I have no much time due to "out in the garden" stuff which needs to be done. So my free time isn't much this time of year.
4MB kit is classed as completed now and is already on sale in my store so there will be no more news about that. In fact there is a new thread for those now anyway. http://www.atari-forum.com/viewtopic.php?f=28&t=27796#p273313