Thank you, Elmer!
This is really fantastic!!!

Here are my memory board design files for EasyEDA, together with the Gerber files and production order files for anyone that wants to get another batch of boards manufactured at JLCPCB.

Thank you kind sir.  Havin' a go ...

(just short of double-row headers at the moment)

/brett

Helló Mindenki

An other new instance for Elmer's plan. Just after the first Power On. There was two reason to rebuild this nice memory extension. Tell the truth, previously I had an 1 MB card from Sebastian Kotek and it works fine, without problems.
First of all I need a second memory card for my second Enterprise. The other goal is to learn, how to soldering Surface Mounted Devices. I know the Enterprise hw, Z80 Assembly and memory mapping and I had knowledges in "traditional" 1/10 inc, hole mounted TTL electronics, but I always tried to avoid the SMD in my hobby projects.

The main steps in short:

1. download the ep64-1536kb-sram-board.zip from this topic
2. Start the online EasyEda
3. Generate a blank project and inport the sch and pcb files from the zip.
4. Click to Order PCB.
(I ordered the IC-s and capacitors separated from the PCB.)
5. The pcb arrived in 10 days or less.
6. I visited my collegaue and asked, I want to watch the mount process.
He was very helpfull and I think I able to proceed similar actions in the future.
7. The mainboard of the Enterprise was ready to receive the memory board because of the previous memory extension. I had to reorganize the adress and power wires in a new 10 pole connector case only.

I am going to test the new extension on the next days.

Thanks to Elmer for the free design and Endre for the soldering lesson.

thanks to Elmer (1.5MB ramcard).  I had some pcb made (£1.80 on offer jlcpcb) and obtained some KM684000ALT-7L  mem chips off eby. ok, I only put one 512k chip on to test but it worked... so £8 for 512k extra    yeaaa!!!