1 Mb Simm expansion for 65xe/130 XE - final solution

[lotharek]

So, I`d like to present FINAL solution for xe - 65 and 130 XE with 4bit memory - 1mb upgrade created by Pasiu - pcbs designed by me

 

 

so...what You will need :

 

- desoldering tools

- soldering iron

- 30 cm of thin cable

 

and .... 10 minutes of time !!!

 

 

Look at the picture :

 

 

 

 

Step by step:

 

OPTION 1

- desolder all memory chips from board (2 or 4) - 2 minutes

- solder back in lower banks 2 precision sockets - 1 minute

- solder into the board simm EXP logic - 1 minute

- connect with wire simm adaptor, mmu and simm logic - 2 minutes

- insert simm adaptor into the board

- insert simm into socket -- READY !!!!!!

 

OPTION 2

 

- desolder two bottom memory chips in 130 xe - 65xe do nothing, except clearing the holes - leave upper two chips in their places

- solder into the board goldpins ( 4 row of 9 pins)

- insert simm adaptor onto golidpins -- SOLDER them !

- solder into the board simm EXP logic - 1 minute

- connect with wire simm adaptor, mmu and simm logic - 2 minutes

- insert simm into socket -- READY !!!!!!

 

 

 

 

expansion doesn`t affect vbxe or anything else...Time -- 10 minutes, EASY ! even my just married wife said it is a piec of cake

 

 

 

 

 

 

 

ps. and that how it looks next to VBXE in my modded Lothari:

 

 

[+Larry]

So, I`d like to present FINAL solution for xe - 65 and 130 XE with 4bit memory - 1mb upgrade created by Pasiu - pcbs designed by me

(snip, snip, snip...)

 

Really, really nice and clean!

 

Is this going to be sold? Have you already done an 8-chip (SIMM) upgrade?

 

-Larry

[danwinslow]

So, I`d like to present FINAL solution for xe - 65 and 130 XE with 4bit memory - 1mb upgrade created by Pasiu - pcbs designed by me

(snip, snip, snip...)

 

Really, really nice and clean!

 

Is this going to be sold? Have you already done an 8-chip (SIMM) upgrade?

 

-Larry

 

Indeed, will the PCB's be sold? I'd buy several.

[Mathy]

Hello Lotharek

 

What's the second row of holes for?

 

greetings

 

Mathy

[Marius]

Is this a static ram solution or dynamic?

 

I have had several 'refresh' issues on these 4bit machines, especially with certain DRAM upgrades using very fast DRAM.

 

Or are SIMMS used with auto refresh?

 

Thanks

Marius

[atarian63]

If you are selling.. I am buying. Please let me know! Looks great!

[+Stephen]

So, I`d like to present FINAL solution for xe - 65 and 130 XE with 4bit memory - 1mb upgrade created by Pasiu - pcbs designed by me

(snip, snip, snip...)

 

Really, really nice and clean!

 

Is this going to be sold? Have you already done an 8-chip (SIMM) upgrade?

 

-Larry

I'll be #2 to ask for an 8-chip version.

 

Stephen Anderson

[MEtalGuy66]

The questions you guys should be asking are:

 

1. What modes of compatabilty does this upgrade support?

eg. Petersen/Rambo, Compyshop, true 130xe(separate antic/cpu access)

 

2. How many wires does it take to hook it up?

Hias's SRAM upgrade only takes 12 wires total, uses a single SRAM chip, and supports all compatability modes.

 

3. Does the PCB intefere (clearance-wise) woth any other popular upgrades, like Videoboard XE ?

 

4. Is the design dependant on the presence of the EMMU socket? The "2 DRAM Chip" 65XEs dont have this chip layed out on the board at all. Does this influence the installation requirements? If so, how?

 

5. As far as the refresh/access time issue goes, one would assume that the design is workable in this respect and this is not an issue..

 

6. Has this design been tested stable on both PAL and NTSC machines?

 

7. What is the cost including shipping to North America or Europe..

[Marius]

 

5. As far as the refresh/access time issue goes, one would assume that the design is workable in this respect and this is not an issue..

 

True. But it depends on IF you can buy it as a complete package, or if you have to built it yourself. If you need one certain type of simm, which might be hard to obtain, it is important to be aware of this issue.

 

If it works perfect with all types of simms, it is more interesting (for me).

[Mathy]

Hello Marius

 

It'll probably only work with 30 pin SIMMs.

 

greetings

 

Mathy

[Marius]

Hello Marius

 

It'll probably only work with 30 pin SIMMs.

 

greetings

 

Mathy

 

Hi Mathy,

 

I was referring to the speed of the rams. I have had bad issues with certain higher speed rams chips on the simms. That is why I asked.

 

Marius