Need help reverse engineering Timex Store Demonstrator ROM file

[XavSnap]

Hi,


Xray views: (user at computer)

(user in the TV)

Have Fun.

[Paul]

My design is different:

I used W27C512 EEProm and three Jumpers to select one of eight Programs.

[1024MAK]

Hi
(user in the TV)

Help!

Xav’s trapping Zeddy users in their telly’s!!!



Mark

[dessony]

Hello everyone,

XavSnap is right about my StroeDemo card readiness. However, it has some problems which require getting two sockets two pieces of wire, and some little black electrician tape to correct the voltage reversal feeding problem and using a printer connector or an extension cable to give EPROM/EEPROM and DC-DC converter some room. I consider these 3 boards, which are in my hands, trash, junk, and not worth it. I would take these components and sockets off the V.1.0 board and then transfer them to a newer board whenever possible.

I was impressed by the way the TSD board operated. It is like putting a game/program cartridge into an Atari 2600 console and then turning the console on, the resulting screen shows up. WOW!

XavSnap and Paul, are these edge connector holes slightly enlarged? And we might have to add a "fingerboard" and edge connector with its wire-wrapping tails to these boards.

Using an Aries ZIF low-profile socket is encouraged. The machine-tooled socket for the EEPROM/EPROM is okay.

As you saw in my video, my computer has its red pushbutton installed on your right side. The pushbutton controls reset.

Thank you very much in advance.

Cheers,
DesSony

[Paul]

Yes, I increased the hole size from 32 to 35 mils.
Does anybody know if there is a footprint of the Aries low profile socket available somewhere?

[XavSnap]

Home made:

DIP-28_LP_W15.24mm_ZIF_Socket_LongPads.kicad_mod.zip

(4.45 KiB) Downloaded 72 times

[XavSnap]

Hi,
Is it possible to use cut DIP socket to add some space?

I can't find the hosted pin diameter in the Datasheet for the "Tulip" socket, but it seems to be large enough to host and convert a PC to a wrapping socket.

New Kicad connector footprint PCB hole 35 mils (wrapping pins):

Connector_ZX_23x2_B_35.zip

(1.07 KiB) Downloaded 65 times

(StoreDemo_V2 gerber updated to StoreDemo_V21)

[Paul]

Thanks Xav!
Yes, it's possible to use turned Pin Socket to enhance distance.
I'm goin to add extra holes to the edgeconnector for pinheader 23x2 in middle of edgeconnector.
Then this can be soldered from bottom side to carry through PCB for more interfaces.

[XavSnap]

Hi,

I share the Kicad ZX81's case drawing/3D (origin on the connector key) :

Mod & 3D case:

Kicad_ZX81_Case.zip

(124.32 KiB) Downloaded 65 times

[XavSnap]

Hi,

My homemade ZIF low profile 3D footprint:

Mod & WRL files:

ZIF_LP.zip

(213.81 KiB) Downloaded 72 times