Jump to content
JGRAHAM2

130XE 512 memory upgrade

Recommended Posts

yes, it's a peterson with some modification. I still have baggie with the stacked chips ready for install

  • Like 1

Share this post


Link to post
Share on other sites
41 minutes ago, _The Doctor__ said:

yes, it's a peterson with some modification. I still have baggie with the stacked chips ready for install

What do you think he as doing on U21?

Share this post


Link to post
Share on other sites

looks like a 5 volt and ground pick off point... using machine pins for convenience...

Share this post


Link to post
Share on other sites

Technically it's 576K total :) (64+512) using portb bits 1,2,3,5,6, so no BASIC or separate ANTIC access to extended memory banks.

 

The switch should reduce memory to 192K total (64+128) using only portb bits 2,3,6 - and restore BASIC & ANTIC functions.

 

Curious to know what OS they programmed onto that EPROM.... care to dump it?

  • Like 1

Share this post


Link to post
Share on other sites
6 hours ago, Nezgar said:

Technically it's 576K total :) (64+512) using portb bits 1,2,3,5,6, so no BASIC or separate ANTIC access to extended memory banks.

 

The switch should reduce memory to 192K total (64+128) using only portb bits 2,3,6 - and restore BASIC & ANTIC functions.

 

Curious to know what OS they programmed onto that EPROM.... care to dump it?

It is the standard and the Expander OS. I have an XL with the same OS. I don’t know what he did with it. He had a very high socket of a type I’ve never seen for the OS. It looked to be high quality, but I couldn’t fit the 4 in 1 OS that I got from you under the keyboard. I removed it and replaced it with a precision socket. I had to add 4 bodge wires connecting to the BASIC ROM as I did damage the board removing it. (Works great, thanks!) It looks to me like this computer was wet at one time. See the picture of the lower shell.

 Posted a dump here: 

 

 

E9C18559-4928-4595-8783-9D41653735D4.jpeg

Edited by JGRAHAM2
  • Like 1

Share this post


Link to post
Share on other sites
8 hours ago, _The Doctor__ said:

looks like a 5 volt and ground pick off point... using machine pins for convenience...

I bought this computer as a lot with some 1050s and a couple XLs from a guy’s son who inherited them. I wish I had asked what he did with them. I’m sure there is quite a story behind them. Two of them were upgraded with memory and the Expander OS that allows multiple RAM disks and to boot from one of them. Someone suggested a BBS in a post I have on this site.

Share this post


Link to post
Share on other sites
5 hours ago, JGRAHAM2 said:

It is the standard and the Expander OS. ....  Posted a dump here: 

D'oh of course... that OS is still so "new" to me it slipped short term memory. :) Still need to test that OS myself on real hardware and hopefully documentation turns up eventually.

Share this post


Link to post
Share on other sites
2 hours ago, Nezgar said:

D'oh of course... that OS is still so "new" to me it slipped short term memory. :) Still need to test that OS myself on real hardware and hopefully documentation turns up eventually.

The thing to remember is you have to choose to boot from your SIO connected device, the same as you choose to boot from the ram disk.

Share this post


Link to post
Share on other sites

After cleaning it up, it looks like this. It was very crusty, like someone really used it, food crumbs and all. I think I’ll keep the badge as it is. A computer that was really used shouldn’t look like it just came from the factory.

 

31EC7A9B-77C7-4573-ABC6-D34D80DDDCB6.jpeg

  • Like 2

Share this post


Link to post
Share on other sites
18 minutes ago, JGRAHAM2 said:

The thing to remember is you have to choose to boot from your SIO connected device, the same as you choose to boot from the ram disk.

Yeah I figured out that much... Just trying to figure out how to access the Mini-DOS that I found evidence of in the ROM, just not sure the key-combination that invokes it...

15 minutes ago, JGRAHAM2 said:

After cleaning it up, it looks like this. It was very crusty, like someone really used it, food crumbs and all.

Very nice! Yeah I had a 130XE that was encrusted in thick smokers tar... dark yellow all over, and the keys were so dark you couldn't see the letters on the keys... Disassembled the case and keyboard (removed the mylar and metal backing) and ran those through the dishwasher. They came out immaculate like just from the factory, not yellowed at all.

 

If there's something to be said for smoking... it protected the plastic from yellowing after all those years.

 

The machine has a Peterson 320K upgrade, having been used for the Eclectic Collective BBS.. so sentimental value to keep that one in there.. Very clean wiring inside - it just needs a multiple OS upgrade added in!

 

(Hmm don't appear to have any pictures of the RAM upgrade handy... will have to take some again next i have that machine open... This was the same machine that had the additional resistors added to "revive" the function keys:

 

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...