Good to know! Jan
From: M100 [mailto:m100-boun...@lists.bitchin100.com] On Behalf Of Gregory McGill Sent: maandag 28 januari 2019 18:10 To: m...@bitchin100.com Subject: Re: [M100] REX in a sub-standard machine I have ram for the 102 at arcadeshopper.com<http://arcadeshopper.com> Greg On Mon, Jan 28, 2019 at 8:15 AM VANDEN BOSSCHE JAN <jan.vandenboss...@vivaqua.be<mailto:jan.vandenboss...@vivaqua.be>> wrote: > All it means is - you need to upgrade your RAM, to enjoy the benefits of more > RAM. That's the bottom line, and that's all I need to know. Now, where can I buy another 8 K RAM chip that fits a Model 102? Greetings from the TyRannoSaurus Jan-80 """"" @ work ( @ @ ) --------------.ooo--(_)--ooo.--- From: M100 [mailto:m100-boun...@lists.bitchin100.com<mailto:m100-boun...@lists.bitchin100.com>] On Behalf Of Stephen Adolph Sent: zondag 27 januari 2019 16:55 To: m...@bitchin100.com<mailto:m...@bitchin100.com> Subject: Re: [M100] REX in a sub-standard machine Classic REX does not have any RAM on it, and it is plug and play meaning there is no hardware /WR signal which is needed for RAM to work. So, yes, a REX enabled machine with limited RAM is still a machine with limited RAM. No shortcoming of REX there. In fact adding REX to any machine brings all the same benefits. Adding RAM to the full extent provides those benefits. They are independent. That was partly my motivation for QUAD, but that is a separate story. All it means is - you need to upgrade your RAM, to enjoy the benefits of more RAM. There is a soon to be released all RAM REX - called REXCPM. The purpose here is to obviously run CPM on M100/T102, but it has a side benefit of doing a full RAM upgrade. (another reason to not stress so much about QUAD). REXCPM has 2MB of SRAM. It is based on bank switching like REX, but it also replaces the internal SRAM. So, you can map any 32k block of SRAM into the optrom space, and you can switch any 16k block into each of the two upper ram 16k blocks. This arrangement can be used to implement all the functions of REX but it also delivers the key thing needed for CP/M, that being the ability to use RAM blocks as a RAM DISK. In M100, REXCPM is plug and play, using the system bus connector and the Optrom socket. In T102, REXCPM needs a small hardware change, and uses the 4th memory chip socket and the Optrom socket. On Fri, Jan 25, 2019 at 4:56 PM Jan Vanden Bossche <jan80...@yahoo.com<mailto:jan80...@yahoo.com>> wrote: Yes, I think so. But that also means I had the concept wrong. I thought that the RAM-switching was done ON the REX, and that the live RAM was on the REX. If I understand it now - sorry I'm slow - the RAM-image is copied into the live RAM of the machine. But, that also mean that, in order to be able to take full advantage of REX, you do need a 32KB machine, or upgrade to it. Sad if you happen to find an 8KB Model 100, or a 24 KB Model 102... :-/ Greetings from the TyRannoSaurus Jan-80 VIVAQUA et HYDROBRU ont fusionné. VIVAQUA est votre société d'eau en Région de Bruxelles-Capitale. VIVAQUA en HYDROBRU zijn gefusioneerd. VIVAQUA is uw waterbedrijf in het Brusselse Hoofdstedelijk Gewest. [http://www.vivaqua.be/facebook.png] Rejoignez-nous sur Facebook - Volg ons op Facebook DISCLAIMER Pensez à l'environnement, n'imprimez cette page et ses annexes que si c'est nécessaire. Ce message électronique, y compris ses annexes, est confidentiel et réservé à l’attention de son destinataire. Si vous n'êtes pas le destinataire de ce message, merci de le détruire et d’en informer l’expéditeur. Toute divulgation, copie ou utilisation de ce mail est dans ce cas interdite. La sécurité et l'exactitude des transmissions de messages électroniques ne peuvent être garanties. Denk aan het milieu; druk deze pagina en de bijlagen alleen af als het nodig is. Dit e-mailbericht (inclusief zijn bijlagen) is vertrouwelijk en is uitsluitend bestemd voor de geadresseerde. Als dit bericht niet voor u bestemd is, wordt u verzocht het te wissen en de afzender te informeren. Het is in dat geval niet toegestaan dit bericht te verspreiden, te kopiëren of te gebruiken. We kunnen niet garanderen dat de gegevensoverdracht via het internet veilig en nauwkeurig is.
