[Coco] 1mb and 2mb memory upgrades

[L. Curtis Boyle]

They did. And there a couple of programs under DECB that used >512k... BIGBASIC was one that I recall was patched for the 1 and 2 MB upgrades. 

Sent from my iPhone

> On Mar 14, 2015, at 4:10 PM, tonym <tonym at compusource.net> wrote:
> 
> When under DECB, did the 1MB and 2MB boards at least function as if they were a 512K upgrade?
> 
> Tony
> 
> 
> ---- Original Message ----
> From: "Bill Pierce via Coco" <coco at maltedmedia.com>
> Sent: 3/13/2015 2:42:10 PM
> To: coco at maltedmedia.com
> Subject: Re: [Coco] 1mb and 2mb memory upgrades
> 
> 
> 
> Brian, exactly :-)
> Paul Barton's last board was up to 64 meg IIRC.
> Here's the link to his old site (or at least part of it)
> http://www.reocities.com/idezilla/CoCoZilla/thumnail.html
> 
> The trick is all in the DAT board as it makes the memory available to the system.
> 
> Keep in mind, this is "available" memory... That doesn't mean anything was ever programmed to use it as no one (that I know of) ever bought enough of the boards to justify writing software for it. I think Robert Gault has one of Paul's 8-meg boards and is the only person I know of with one.
> With that said, even the 1 & 2 meg upgrades have never been used for anything in DECB other than maybe a ramdisk.
> NitrOS9 will automatically use the 1 & 2 megs for more 64k workspaces, graphics, get/put buffers, and windows. Any more than 2 meg and OS9 would have to be slightly modified again, but no big deal, just an extended memory map and a few bytes changed in IOMan. Still 100% compatability :-)
> To use this memory in DECB, the roms would have to be completely re-written losing all compatability with old software....  and may be with some rom mods, extra graphics pages.
> Chalk another one up to the modularity of OS9 as it lost no compatability, only gaining in versitality :-)
> 
> 
> Bill Pierce
> "Today is a good day... I woke up" - Ritchie Havens
> 
> 
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> 
> 
> 
> -----Original Message-----
> From: Brian Blake <random.rodder at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Fri, Mar 13, 2015 1:47 pm
> Subject: Re: [Coco] 1mb and 2mb memory upgrades
> 
> 
>> On 3/13/2015 1:46 PM, Luis Antoniosi (CoCoDemus) wrote:
>> 2MB is the maximum you
> can use in the MMU registers: 256 x 8K
>> 
>> Luis Felipe Antoniosi
> 
> Someone
> forgot to tell that to Paul Barton....
> 
> 
> 
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