Search found 206 matches

by Zippy Zapp
Fri Oct 01, 2021 4:40 am
Forum: Hardware
Topic: Building a NeoRam Ram expansion memory cartridge for the C64 computer
Replies: 40
Views: 8625

Re: Building a NeoRam Ram expansion memory cartridge for the C64 computer

Thanks guys. @banman, did you order with beveling? Just curious if the NeoRAM has the required space at the edge.
by Zippy Zapp
Wed Sep 29, 2021 3:21 pm
Forum: Hardware
Topic: Building a NeoRam Ram expansion memory cartridge for the C64 computer
Replies: 40
Views: 8625

Re: Building a NeoRam Ram expansion memory cartridge for the C64 computer

I see you get a few choices for board thickness. Was there a standard back then? I see some of my carts are not as thick as others. Epyx Fast load seems to be less than modern boards. What thickness do you typically use?
by Zippy Zapp
Wed Sep 22, 2021 10:51 pm
Forum: Hardware
Topic: Building a NeoRam Ram expansion memory cartridge for the C64 computer
Replies: 40
Views: 8625

Re: Building a NeoRam Ram expansion memory cartridge for the C64 computer

Would you happen to know what type of HM628512 SOIC RAM chips you have on your PCB? Thanks. They are HM628512CLFP-7 It seems you had much better success at the reliability of your RAM chips than I had. I am getting more PCB boards delivered and I will order Ram chips from the links you used. I want...
by Zippy Zapp
Wed Sep 22, 2021 7:55 pm
Forum: Chit Chat
Topic: GeoRAM clone prototype working!
Replies: 22
Views: 3754

Re: GeoRAM clone prototype working!

Super cool, looks great.
by Zippy Zapp
Tue Sep 14, 2021 3:33 pm
Forum: Hardware
Topic: Building a NeoRam Ram expansion memory cartridge for the C64 computer
Replies: 40
Views: 8625

Re: Building a NeoRam Ram expansion memory cartridge for the C64 computer

Ok, thanks for the information it is much appreciated.
by Zippy Zapp
Tue Sep 14, 2021 12:01 am
Forum: Wanted
Topic: WTB: Epyx Vorpal Utility Kit USA (disk only or complete)
Replies: 2
Views: 1263

Re: WTB: Epyx Vorpal Utility Kit USA (disk only or complete)

Thanks for the tip. I had a copy too that I bought back then but I lost mine as well. I can't find it for the life of me. I have only found the backup I made of it with a SuperCard. I think it worked fine minus the reverse side for alignment. I do have an oscilloscope sitting unused in the box, perh...
by Zippy Zapp
Mon Sep 13, 2021 11:40 pm
Forum: Hardware
Topic: Building a NeoRam Ram expansion memory cartridge for the C64 computer
Replies: 40
Views: 8625

Re: Building a NeoRam Ram expansion memory cartridge for the C64 computer

I used lots of flux. I use it in gel form and it comes in a large syringe. It's near impossible with out it. @eslapion, Do you test your PCBs before you solder the components on? How would I test something like the NeoRam or Super Snapshot PCB? I usually just assume they did that when they made it b...
by Zippy Zapp
Mon Sep 13, 2021 5:23 am
Forum: Hardware
Topic: Building a NeoRam Ram expansion memory cartridge for the C64 computer
Replies: 40
Views: 8625

Re: Building a NeoRam Ram expansion memory cartridge for the C64 computer

Just to confirm, these are the RAM chips from the seller suggested on https://www.hackup.net/2019/04/the-neoram-remix/ K6X4008C1F or HM628512 https://www.ebay.de/itm/5pcs-HM628512LFP-7-8-bit-High-Speed-CMOS-Static-RAM-SOP-32/253164178362?mkcid=1&mkrid=707-53477-19255-0&siteid=77&customi...
by Zippy Zapp
Mon Sep 13, 2021 3:07 am
Forum: Hardware
Topic: Building a NeoRam Ram expansion memory cartridge for the C64 computer
Replies: 40
Views: 8625

Re: Building a NeoRam Ram expansion memory cartridge for the C64 computer

Ok cool thanks for the tip I will check out JLPCB because unlike everybody else on the planet I am not a huge PCBWay fan. I have used OSHPark for quite a few years and I haven't really had a problem, but yeah they are expensive. It cost me $35 for 3 boards. But some small stuff is only a few dollars...
by Zippy Zapp
Sat Sep 11, 2021 7:35 pm
Forum: Hardware
Topic: Building a NeoRam Ram expansion memory cartridge for the C64 computer
Replies: 40
Views: 8625

Re: Building a NeoRam Ram expansion memory cartridge for the C64 computer

Ok I finally fixed it. To answer the question above my chips are Hitachi. Some were made in Japan and some in China. They seem legit. After I took all the RAM chips off the board I cleaned it up, tinned the pads and soldered them back on. This time it was cleaner although one of the ICs is crooked b...