Author Topic: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project  (Read 39789 times)

0 Members and 1 Guest are viewing this topic.

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #50 on: July 03, 2017, 08:05:12 am »
Huzzah! My 1000 EX finally arrived and in fair condition, the keys need some retr0bright and the the case needs a clean which I knew, but the power cord has some damage at the plug and needs replacing.



If any US residents are visiting their local Home Despot this week, could they please grab a 3-pin mains plug for me? I'm more than happy to pay for USPS shipping, the cost of the plug and some extra coin for a 6-pack of beer?  8)

The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #51 on: July 04, 2017, 05:24:51 am »
I managed to find a couple of fairly decent looking US NEMA 515 plugs in white online - this will allow me to get the old girl up and running again safely.  8)

http://www.leviton.com/en/products/3w101-wh



This morning before work I managed to pop the lid off and check out the 2 expansion cards - much to my delight, the memory expansion is fully populated so the machine has a full 640kb ram. The second card is a Tandy 1200 baud internal modem which will be replaced by a dual serial ISA card to drive a serial mouse.

« Last Edit: July 04, 2017, 05:28:32 am by djos »
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #52 on: July 05, 2017, 02:22:47 am »
I got some this morning (before work) to test the physical aspects of my design (old one below).



I printed out the design and a few revisions as I found that it needed significant realignment of the header compared to the ISA Slot - the new version has the ISA slot pins offset by only about 2.3mm to the right as opposed to about 7.6mm. the PCB was also way too tall to fit in the top PLUS slot so I've shortened the PCB by quite bit.

Im pretty confident in the design now so I'll add back in the copper pour and I may (or may not) even modify the ISA slot part to remove the screw fixings that my ISA slots dont have.
« Last Edit: July 05, 2017, 02:25:13 am by djos »
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #53 on: July 05, 2017, 10:20:07 am »
and Done! I just need to order the boards from Elecrow!  8)



EDIT: Order Placed.
« Last Edit: July 05, 2017, 11:10:16 am by djos »
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #54 on: July 09, 2017, 09:04:31 am »
Argh, I realised today I've made a monumental stuff up! I followed the wrong diagram in the tech reference manual with for some odd reason shows the pinouts mirrored!  I found the schematics deeper in the tech reference manual diagrams that I believe are correct based on what I'd read previously. :palm:

So I've had to re-design the PCB's! I just hope my email to Elecrow gets to them in time to cancel my original design.  |O

anyhoo, here's the corrected version.






The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Online bitseeker

  • Super Contributor
  • ***
  • Posts: 8209
  • Country: us
  • Lots of engineer-tweakable parts inside!
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #55 on: July 09, 2017, 09:27:18 am »
At least you're not running a million of them! ;D
I TEA.
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #56 on: July 09, 2017, 09:51:38 am »
At least you're not running a million of them! ;D

Too true.  :-+
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 
The following users thanked this post: vk6zgo

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #57 on: July 09, 2017, 11:14:43 am »
I decided to make use of the time and modified the ISA Slot to remove the mounting points and it makes the board shorter, thus cheaper to make too.





I'll get them made in Blue like the little FDD boards:



« Last Edit: July 10, 2017, 10:26:30 am by djos »
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #58 on: July 10, 2017, 10:27:18 am »
So I was too slow in realising my mistake and I couldnt cancel my order with Elecrow - nvm, I expected to make some mistakes along the way.  :-/O Anyhoo, I've ordered the latest version.   8)

Amusingly, I may just be able to rescue version 1 of the PCB by installing the right angle header on the "wrong" side of the PCB... I need to test my theory tho...  :-DMM

PS. I tweaked the design slightly to improve component clearances and add the board version.

« Last Edit: July 10, 2017, 10:51:12 am by djos »
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline rorysl

  • Contributor
  • Posts: 6
  • Country: ca
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #59 on: July 16, 2017, 03:50:09 pm »
Hey there! Been following this thread with interest. I have a Tandy 1000HX, very similar to the EX, and have been trying to figure out how to add more memory. Plus adapters and the Memory Expansion Card seem to be impossible to source though. If I understand this thread correctly (I'm a bit of a noob) you're designing your own Plus adapter for the Tandy Memory Expansion Card you already have?

If I were to buy or build a Plus card adapter are there any other memory cards that would work with my Tandy? Or do I have to have a Tandy brand one?

Any help or suggestions are greatly appreciated!!
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #60 on: July 16, 2017, 08:53:36 pm »
Hey there! Been following this thread with interest. I have a Tandy 1000HX, very similar to the EX, and have been trying to figure out how to add more memory. Plus adapters and the Memory Expansion Card seem to be impossible to source though. If I understand this thread correctly (I'm a bit of a noob) you're designing your own Plus adapter for the Tandy Memory Expansion Card you already have?

If I were to buy or build a Plus card adapter are there any other memory cards that would work with my Tandy? Or do I have to have a Tandy brand one?

Any help or suggestions are greatly appreciated!!

G'day, unfortunately Tandy used their own custom DMA /memory controller chip on the EX / HX ram expansion board so cloning it isn't simple. The best thing to do is buy another EX / HX that has it and go from there.

Technically my adapter will work without the ram board but very few expansions will work without the DMA controller.
« Last Edit: July 16, 2017, 08:55:07 pm by djos »
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline rorysl

  • Contributor
  • Posts: 6
  • Country: ca
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #61 on: July 16, 2017, 11:42:50 pm »
Ah! Drag. Ok then. Feel free to send me your Memory Expansion Board then. Lol  :-DD

In all seriousness though, thanks for the reply -- the HX/EX is a tough system to find peripherals for and information on!
« Last Edit: July 16, 2017, 11:45:44 pm by rorysl »
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #62 on: July 17, 2017, 12:03:06 am »
Ah! Drag. Ok then. Feel free to send me your Memory Expansion Board then. Lol  :-DD

In all seriousness though, thanks for the reply -- the HX/EX is a tough system to find peripherals for and information on!

Lol, I'd luv to design a new Ram expansion board for the EX/HX machines but im an amature with very very poor understanding of digital logic design. :(

There's a ton of good info and documentation here including the reference manuals for the EX & HX:

http://www.oldskool.org/guides/tvdog/documents.html

and his FAQ is great too:

http://www.oldskool.org/guides/tvdog/1kfaq.html
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline rorysl

  • Contributor
  • Posts: 6
  • Country: ca
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #63 on: July 17, 2017, 12:30:41 am »
Thanks for the links -- I think I've come across them before in my quest. For now, I'm going to concentrate on upgrading to a NEC V20 and maybe installing a SmartWatch chip and keep scanning eBay for memory expansion cards!
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #64 on: July 17, 2017, 12:49:32 am »
Thanks for the links -- I think I've come across them before in my quest. For now, I'm going to concentrate on upgrading to a NEC V20 and maybe installing a SmartWatch chip and keep scanning eBay for memory expansion cards!

Cool, I've a got a couple of V20's lying around too and have also ordered a compatible smart watch chip from Asia.  8)
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline WastelandTek

  • Frequent Contributor
  • **
  • Posts: 538
  • Country: 00
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #65 on: July 17, 2017, 01:04:54 am »
lol

the deeper I dig in this forum the more crazy I find

good crazy, mind you
I'm new here, but I tend to be pretty gregarious, so if I'm out of my lane please call me out.
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #66 on: July 17, 2017, 01:35:47 am »
lol

the deeper I dig in this forum the more crazy I find

good crazy, mind you

hehe, yeah you do have to be a bit mad to enjoy playing with 20-30 year old computers.  :-DD
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Online bitseeker

  • Super Contributor
  • ***
  • Posts: 8209
  • Country: us
  • Lots of engineer-tweakable parts inside!
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #67 on: July 17, 2017, 05:02:38 am »
I've got a CoCo 1 from 1981 that's been waiting for diagnosis of screen garbage when powered on. It was my first home computer, so one day I'll get it up and running again. I probably have the cassette tapes for it somewhere. I learned to program on a TI 99/4 (1979), but never got around to acquiring one.
I TEA.
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #68 on: July 17, 2017, 05:51:23 am »
I've got a CoCo 1 from 1981 that's been waiting for diagnosis of screen garbage when powered on. It was my first home computer, so one day I'll get it up and running again. I probably have the cassette tapes for it somewhere. I learned to program on a TI 99/4 (1979), but never got around to acquiring one.

Nice! I recall seeing the Coco 2's and 3's in my local Tandy Electronics in the 80's, great little machines for the time!

I learned to code in basic on an Amstrad CPC-6128 in primary school about 2 years before we got our Tandy 1000 EX, but I've never really felt the desire to get one. Prolly due to my distaste for the shockingly expensive 3" floppy disks I had to spend my lawn mowing money on so I could get a copy of my own programs.  :-DD
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline rorysl

  • Contributor
  • Posts: 6
  • Country: ca
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #69 on: July 17, 2017, 03:32:59 pm »
Cool, I've a got a couple of V20's lying around too and have also ordered a compatible smart watch chip from Asia.  8)

Awesome -- would you mind sharing the model number or link? I need to order one myself that is EX/HX compatible.
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #70 on: July 17, 2017, 08:55:03 pm »
Cool, I've a got a couple of V20's lying around too and have also ordered a compatible smart watch chip from Asia.  8)

Awesome -- would you mind sharing the model number or link? I need to order one myself that is EX/HX compatible.

I found some NEC V20 D70108HCZ-16 units on eBay, as long as they are D70108HCZ-8 or better they'll work fine.
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline rorysl

  • Contributor
  • Posts: 6
  • Country: ca
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #71 on: July 17, 2017, 09:36:41 pm »
Great! And the Smartwatch compatible chips were...?

Thanks again for all the help!
 

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #72 on: July 17, 2017, 09:59:45 pm »
Great! And the Smartwatch compatible chips were...?

Thanks again for all the help!

These ones

https://www.ebay.com.au/itm/182164983799
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 
The following users thanked this post: rorysl

Offline djos

  • Supporter
  • ****
  • Posts: 960
  • Country: au
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #73 on: July 21, 2017, 08:59:20 am »
So my v7 design while it works (electrically if right angle header is mounted on the back side of the board).

V8 is more compact and cheaper to make as the PCB is shorter (there's no need for the mounting holes on either side).




« Last Edit: July 21, 2017, 09:10:38 am by djos »
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline DavinD

  • Contributor
  • Posts: 29
  • Country: us
Re: Tandy 1000 ex/hx PLUS Expansion to 8-Bit ISA Riser card project
« Reply #74 on: July 24, 2017, 02:14:05 am »
So, the cable I made doesn't fit into the 1000ex.  It has the right number of pins, but the connector is too wide.  I would need to break the plastic edges off the connector on the expansion board, and I'm not sure I want to do that.  :(
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf