maprom 1.8 working on TT

Blogs & guides and tales of woo by forum members.
User avatar
stephen_usher
Site sponsor
Site sponsor
Posts: 7380
Joined: 13 Nov 2017 19:19
Location: Oxford, UK.

Re: maprom 1.8 working on TT

Post by stephen_usher »

Both maprom and romspeed do the same thing. They take a copy of the ROM, put it into TT-RAM and then change the 68030 MMU translation tables so that the RAM copy maps to the ROM address. It's as simple as that.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
Steve
Posts: 3308
Joined: 15 Sep 2017 11:49

Re: maprom 1.8 working on TT

Post by Steve »

@stephen_usher yes but going by the results in this thread it seems they do certain things differently due to the massive speed increase the TT has for romspeed Vs maprom.
User avatar
thorsten.otto
Posts: 148
Joined: 04 Nov 2019 02:20

Re: maprom 1.8 working on TT

Post by thorsten.otto »

Steve wrote: 23 Feb 2021 21:28 @stephen_usher yes but going by the results in this thread it seems they do certain things differently due to the massive speed increase the TT has for romspeed Vs maprom.
Could be that maprom marks the mirrored ROM as non-cacheable?
User avatar
stephen_usher
Site sponsor
Site sponsor
Posts: 7380
Joined: 13 Nov 2017 19:19
Location: Oxford, UK.

Re: maprom 1.8 working on TT

Post by stephen_usher »

Actually, I think the latest version of maprom does turn off the cache due to issues of some kind I can't remember. I recompiled it without that restriction.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.

Return to “MEMBER BLOGS”

Who is online

Users browsing this forum: ClaudeBot, rubber_jonnie, Steve and 18 guests