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From memory: Dragon 32 x3 (or is it x4?) Dragon 64 Atari 800 ZX81 Memotech RS128 Atari 520STF (512k) Atari 520STFM (1024k) Atari STE (2Mb) BBC Master 128 + Retroclinic Datacentre BBC B Archimedes A310 Acorn A3020 Acorn 7000+ Psion 3a (2Mb) Raspberry Pi running RISC OS (not quite retro perhaps?) John.

I'm a bit late to this but haven't been on the forum for a while - please forgive my tardiness. I was a child of the '80s micros (mostly Dragon 32/64s), but bought an RS128 off a mate at uni in the '90s (it was a whim - I had no idea what I was buying - only that it looked cool). PC's became ubiquit...

Dave wrote:Hi,nice photo - mmm, where have I seen that before ?

Likewise, looks just like my old MTX512 - even down to the scratch on the far right of the base

Hi Andy, I'm a bit reluctant to start removing ROMs (on the basis they've been in there 30 yrs...), I note your site suggests that you can keep the ROM in situ but lose some functionality. Would I need to replace the PAL too? Dave - I have yet to open the RS128 up (I need to find enough time), the P...

Hi Dave, I got the impression that Pg 44 of the service manual suggested that 64K machines would have different links (and/or PALs) than the 32K ones? Unless there were two types of 64K machines, those with 64K on board and those with an add on card providing the other 32? EDIT - I plan to open up t...

OK, I see the links 6 & 7 you mentioned on Pg 44 of the service manual. Looking at the photos it seems hard to believe that the links have been 'retro-modified' had a memory board been removed from the machine.

I presume the reference to a 'blue PAL' in the manual relates to the blue sticker.

Thanks Dave, I meant to type "I'd be grateful if somebody could point out _where_ the PAL/GAL lives?" which you have answered :) It's not visible from the photo, but there is a break in the plastic under one of the RS232 port holes, suggesting it may once have had ports fitted. I've closed...

Hi All, I've finally got round to opening up the 512, the RAM chips appear to be OKI M3732H-20RS chips but there's no sign of any previously removed boards etc. The board is revision 4000-04. Photos here: http://www.flickr.com/photos/john-halliwell/sets/72157632737248802/ I will get some more photos...

Hi All, I get the impression this project has stalled? If so how far did it get? I have been interested in developing a micro from scratch and this project might be something I'd consider looking at (although I'm thinking a 'generic' Z80 based system is more practical than a 20MHz MTX...). A few tho...

Thanks Crazyboss,

Yes, I'm considering an RM2, I just need the time to open a machine up and understand the PAL/GAL & ROM situation and how they affect the setup.

John.