Unexpected 800 ram and os cartridge mods.

[gs80065xe]

I purchased an 800 off Ebay a year ago. And found that it was having some display issues. So I'm just getting back to this. I was prepared to purchase an OS board from BestElectronics because it contains the Antic and GTIA chips. But Bradley wants to try some other things first. The first thing is to reseat the ram and os cards. And when I pulled them out, I noticed all the jumper wires and piggy backed chips on the OS and one RAM card. Don't recall those on the ones we had in my original 800. Any guess as too what's going on?

[+David_P]

Looks like a 256K upgrade.  Check 

 

 

 

 

[Rybags]

For sure it does look to be 256K - the DRam chips give it away.

 

Likely one of the memory test programs around should be able to pick up on the config.  800 Ram upgrades above 48K AFAIK used at least 2 or 3 different schemes.

[gs80065xe]

On 3/13/2020 at 7:31 PM, David_P said:

Looks like a 256K upgrade.  Check 

 

The link in the post goes nowhere. I some searching and found something on Atari Archive. https://www.atariarchives.org/cfn/12/02/0110.php

But it does not include the figures to compare it with. But there is mention of what I think is adding jumpers to the CPU board. But I didn't see any jumpers on my CPU board.

 

 

 

Edited March 27, 2020 by gs80065xe

[drac030]

Is this supposed to be Axlon-compatible? If so, insert the SpartaDOS X cartridge, if you have one, power up the machine, then type MEM (or MEM /X) at the DOS prompt and see what it says.

[gs80065xe]

I don’t know. I don’t have SpartaDos X cartridge. But I have an AVG cart coming. I’ll try then. In the mean time I’ll try to ask the seller if he knows.