I didn’t updated here really often during the last month because I was quite busy and didn’t had a lot of time to works on my projects. I have more time now, and wow, I’ve made a lot of things recently!
As I previously posted, the Oric Mouse project is underway, I’ve discovered a few stupid mistakes and I was too confident when I made the PCB, I’ve overlooked something on the voltage that the 6502 and 6522 will accept as logic high, and of course both of them doesn’t like the 3.3V that I send them as a logic high… The result will be that I need to do some changes on the schematics for that project, but no worries, I will still be able to use the prototype I’ve made, but it’s just slowing down the project a bit, but it will be back on track quickly.
I am the proud owner of an Apple IIgs, that was gifted, for a few years now and played a lot with it. But as I don’t currently have a RGB monitor for it, I always used the composite output to get the video display, and I always complained about the fact that this fancy stuff only want to display in monochrome, or maybe in NTSC. I’ve searched for information about that for some times now and never found anything intereseting, and lots of people (including apple?) says that the composite output is monochrome, at least in PAL regions.
Yes, nearly 1 year after the release of the Issue 6.1, I finally made the Issue 7 that would fix the VSYNC problem the previous release had!
What’s new in the Issue 7:
There is now a 2 pin header to plug a reset button
The hardware VSYNC should now work correctly
One of the two ROM socket has been removed to reduce the schematic complexity, but it is now possible to use the original ROM, or any EPROM without the need to change anything on the PCB, because the /ROMDIS signal has been changed!
Better, it is now possible, and easily to use a 32K EPROM with the addition of a switch (there are pin on the PCB for this) to select the memory bank.