Slow Slow Slow

Things slowed down a bit on the Build of my update, I need to improve my soldering skills and ability to order the right ICs. It would also be a lot better if I didn't throw away the FLASH chip with the old broken socket. 

Just a single 74HCT08 to go.

Comments

  1. Cuvtixo10 November 2020 at 13:44

    It's been a while. Maybe slow, slow, slower than you intended!. I'm very much a beginner and maybe out of my depth, but I wanted to make a Jupiter Ace replica. Minstrel 4 is available, but I want a usable keyboard!! and maybe save a few more bucks. I'm not sure how to order PCBs to be sent to the US. I'm guessing I can get one cheaper via China than the UK guys on Tindie (although maybe I have to order 5 minimum? How does that work?)

    ReplyDelete
    Replies
    1. Unknown15 March 2022 at 07:12

      It sure looks Cool !

      Though : Could you not pop all those 74 TTL logic ICs onto a CPLD...XC95108 PLC84 ?? Would probably half the size of the PCB !

      Delete
    2. Unknown15 March 2022 at 07:13

      Hi.

      Fantastic Project !

      Will this be available to buy ...and if so when ?

      Delete

Post a Comment

Popular posts from this blog

Interrupted

Image
It has been a while. Full-time paid employment means I have enough cash to finish this but limits the time I can spend finishing it. The current state of play it that I have added some SMDs to get in some practice with those. One of the SMDs is a frequency multiplier so that with the original crystal to drive the video I can vary the CPU speed from the 3.278MHz of the original ACE up to 19.668MHz and perhaps beyond. I've also made some modifications to make the KIO optional and enable full ACE compatibility. The KIOs are very difficult to get hold of and with Z84C15 and Z182 available these seem like the best CPU to be going forward. The fastest CPU I have is 20MHz and while I had to up the speed of the RAM, everything else seem happy on the CPU side. The Video was less happy, but I am not 100% convinced that was a speed problem. The multiplier I'm using on this board is a Renesas 512MLF , which is pin compatible with the On Semiconductor NB3N502DR2G , though the multiplicat
Read more

CPLDs & Xilinx

Image
One of the problems with GALs is the development tools which are way out of date. Though preparing the files by hand doesn't seem to be too difficult. The other problem is the relatively small number of pins. The next step up is  Complex Programmable Logic Devices ; CPLDs come in a far larger variety and there or some development kits available for the older legacy designs.    Some of Microchips' offerings, such as the ATF1504AS, can be programmed using WinCUPL like GALS. They also offer a full system such as ATF15XX-DK3-U that can be bought from the likes of Mouser at reasonable prices, though it is quite a high value for reasonable. Lattice & Intel also do similar things.   Having done a bit of research and found that Xilinx has released their old Integrated Synthesis Environment; ISE system, which does schematic capture. I decided to check out that route. Schematic capture is not used that much, but, I find it very useful when translating the logic designed in KiCAD and
Read more