Acorn BBC Micro Master MMC storage system + Switchable Multi OS MOS

Vendu Voir des articles similaires EUR 46,73 Achat immédiat, EUR 2,63 Livraison, 30-Jour Retours, Garantie client eBay
Vendeur: ctorwy31 ✉️ (4.703) 100%, Lieu où se trouve: PLYMOUTH, Devon, GB, Lieu de livraison: WORLDWIDE, Numéro de l'objet: 222440159040 Acorn BBC Micro Master MMC storage system + Switchable Multi OS MOS .

This upgrade will allow you to attach solid state storage to your BBC Master

  • Fast, reliable data storage for BBC Master
  • Professionally made PCB
  • 128MB MMC card included
  • Can be mounted internally or externally
  • Draws its power from the User Port - no PSU required
  • Switchable MOS included

This kit is basically a two-in-one upgrade intended for the BBC Master 128. You not only get the MMC solid state storage system but also a replacement MOS ROM that can be switched between three main different versions, 3.20, 3.50 and 1.20. OS 1.20 can enable your Master to run software originally intended for a Model B and which does not run in standard Master mode (3.20 and 3.50). The combined MMC and Multi OS represents a significant saving on buying the same items separately.

One of the advantages of this Multi OS is that it provides many of the useful features of the Master even in OS 1.20 mode. These include the ability to electronically 'unplug' ROMs in order to prevent clashes, disabling or enabling coprocessors etc. All these settings are remembered even when the machine is switched off so you won't have to keep on configuring the computer every time it's used. It's extremely useful and no other Multi OS allows you to do this.

MOS versions 3.20 and 3.50 have been patched for Y2K and you can see more details of the MMC system and switchable MOS in their separate listings.

Normally, the MMC system is supplied with the filing system firmware on a separate EPROM. For this upgrade, no MMC EPROM is included because the firmware has been incorporated into the switchable MOS ROM. This approach frees up a ROM socket in the machine.

FAQ

I've got a Master and a Model B. Can I use the switchable MOS in the Master and put the MMC system in the Model B?

Yes, but you need to remember a couple of points. The first is that the switchable MOS for the Master contains the code to drive the MMC system. If, therefore, the MMC interface is not present then there is no real point in having the code for it in the Master. The second point follows on the from the previous one. The MMC system intended for the Model B is supplied with the required filing system code on EPROM. No separate EPROM is included here because the upgrade is really intended for Master owners. However, it is not a difficult job to copy the code out of the Master MOS, save it to a floppy disk and then copy it onto a new EPROM for use in a Model B (or B+). The MOS chip can always be reprogrammed - see below.

Can the MOS chip be reprogrammed?

Yes, but not while it's in the machine. It's based on an M27C801 (or equivalent) 1MB EPROM in DIL package. The device can be erased and providing you have a suitable programmer, reprogramming it with new contents is easy enough. That said, the Master is fairly well equipped with extra ROM sockets (optionally configurable as sideways RAM instead), so this can be the easiest way to personalise your system.

Money-back g uarantee

The product is covered by a 1 year guarantee. Additionally, most eBay Buy It Now sales are covered by the Distance Selling Regulations (DSR). In essence this gives you a 30-day period in which to return the goods for any reason whatsoever. If you wish to return this item in the 30-day period then you will receive a full refund (cost of the item itself and the postage too). The cost of returning the item to us is to be borne by the purchaser unless, of course, the item is actually faulty in which case we will refund any reasonable postage costs as well.

For UK buyers this offer is extended further. You can return the item in good condition for any reason whatsoever within 30 days for a full no-quibble refund. Not only do we refund the full amount paid but also the return postage (first or second class standard). What do you have to lose by checking it out?

  • Condition: Neuf
  • Brand: Acorn
  • Manufacturer warranty: 1 year

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