Q. You recently previewed the Commodore 128 and from what was said it sounds like an ideal machine as an upgrade for my C64.

However, you said it is 100 per cent compatible with the C64 but I have read from a different magazine that it will be only partially compatible. If it is totally compatible, does this apply to disk compatible, does this apply to disk software and fast-loading tape programs?

Finally, when will it be available and how much will it sell for?

F. Wong Portsmouth, Hants.

A. We stand by our story, although where unreleased products are concerned you'd be well advised to take everything with a pinch of salt.

But, Commodore insists that the C128 will be totally compatible with the C64 thanks to an upgraded version of the C64's 6510 processor. This will allow a hardware-switchable emulator mode. We suspect there may be a catch with fast-loading tapes, and you would be sensible to hang on to your 1541 disk drive in case an upgraded drive presents unforeseen problems.

As to availability and price, Commodore has made no announcements yet. Watch PCN for developments...