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EasyFlash 1CR cartridge (narrow sram)
Many modern Commodore 64 games and releases use the Easyflash format and the software is distributed as an EasyFlash .crt file. In order to play EasyFlash releases on a real Commodore 64/128, you need an Easyflash cartridge or a cartridge that can act like an EasyFlash cartridge. In some cases you want to store many games on a cartridge. In such cases solutions as the 1541 Ultimate II+, Kung Fu Flash or EasyFlash 3 are the way to go. However, in many cases you want dedicated cartridge for the game. In these cases the original EasyFlash1 is the way to go.
The EasyFlash 1CR is a cartridge from the Commodore 64/128, that is functionally equivalent to the EasyFlash 1 by Thomas Giesel, but has been redesigned so it can be built from less components and make it compatible with more cartridge cases. Allthough it contains less components, no corners have been cut and the functionality is exactly identical as the original. (The reset button has been removed though.) The lower amount of components reduces the component cost, but also reduces the amount of work to build the cartridge and even the lower weight reduces the cost to ship it, making it possibly the most affordable EasyFlash cartridge yet.
This cartridge is compatible with the large library of available EasyFlash releases and all of those releases are suitable to be installed on the cartridge. EasyFlash cartridges can also be used as so called "multicarts". In a multicart, multiple standard C64 cartridges, which can be either 8K, 16K or Ultimax cartridges, are combined on a single cartridge with a menu interface.
The cartridge has two mounting holes, which makes it compatible with a range of available cartridge cases. The following C64 cartridge cases are compatible:
More information can be found on the web page of the cartridge.
You can install software into an EasyFlash cartridge with the EasyProg utility. EasyFlash cartridges are 1MB in size. It is highly recommended that you have a C64 storage medium at your disposal that can handle 1MB files. Examples of such storage media are the SD2IEC and 1541 Ultimate.
This is version of the EasyFlash 1CR is for narrow 0.3" SRAM chips. There is also a version for 0.6" wide SRAM chips.
Recommended manufacturing parameters:
- Single pieces
- Thinkness: 1.6mm
- Material: FR-4
- Surface finnish: HASL lead-free
- Via process: Tenting vias
- Copper weight: 1 oz Cu
Many thanks to Thomas Giesel for the original EasyFlash design.
BOM note: Capacitor C1 (33pF), Diode D3 (BAV21), resistors R2&R3 (10k) and MOSFET Q1 (2N700) are critical components for timing, using components with slightly different specifications may cause malfunction.
Jumper note: There are jumper pads on the backside of the PCB to select between 6116 or 6264/62256 SRAM chips. By default the jumper is wired to 6116, therefore if you use 6264 or 62256 then you will have to cut the connection, or otherwise the cartridge will not work.
EasyFlash 1CR cartridge (narrow sram)
*PCBWay community is a sharing platform. We are not responsible for any design issues and parameter issues (board thickness, surface finish, etc.) you choose.
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Are you using the case designed by Bigby? https://www.printables.com/model/411545-easyflash-1cr-cartridge-case I know he was aware of this matter when he did design the case and therefore I would expect this to be no problem.
No, I downloaded the EasyFlash 1CR Cartridge Case by HackUp (https://www.thingiverse.com/thing:5882186). The PCB fits perfectly, but the edge connector stays too inside the shell and doesn't make a reliable contact. I solved in a rough way, simply moving the inner pin (the one with the hole for the screw) 2 millimeters close to the connector side of the shell; however, since some components (the transitor, the two resistors and the diode) are very close to the edge, the upper half of the shell hits the components, so the inner label must be crop, causing the components to be visible (exposed). Not a big trouble; I was able to fit all the ten PCBs inside the printed shells without problem, however a 2 mm longer edge connector would solve the issue.
It is the same cartridge case. It think it would be a good idea if you get in contact with Bigby, you can find him on the Forum64.de forum. He can likely make an adjustment to the 3D model. However, I haven't heard of this problem before and Bigby did build his own EasyFlash 1CR cartridges to make his case fit perfectly. In that respect, it is a bit surprising that you experience problems.
Yes, it fits perfectly, I agree. But I tested it with a C64 breadbin, a C64C and 64-SX and the cartridge doesn't make a good contact because the PCB edge connector is a little bit shorter. Not a big problem for me, I'm not writing to complain, actually. I modified the cartridge, made some rough arrangements and I solved the problem some way. I only left here my case just to let you know. Maybe other people had the same problem but they simply didn't tell anything about. Cheers, Giovanni
I confirm that this connector should be about 2mm longer. The cartridge is great, but when used inside a shell it barely connects. It's 50/50 it will work. Apart from that great design.