On 19/05/02 at 19:21 Dexter wrote: On 19 /05/02 [EMAIL PROTECTED] wrote: > >> I have a QPower regulator or two which were developed for the QL - �5 >> each including postage if anyone is interested.. > >An alternative approach, when QPower upgrades are no longer available, is >to replace the 1A 7805 with a 1.5A 7805 voltage regulator. The 1A version >when worked hard tends to be bumping up against its thermal protection and
>shutting down. The 1.5A version works better under heavier loads. Neither of which have any relevance since neither the Qubide or the GC applied to a regular QL power from the 5V supply. The regulator in the QL only powers the QL. The Qubide also hardly uses any current at all anyway. You may have a problem if it's an older GC, in which case it does not supply two address lines (A18 and A19), which need to be pulled low using resistors. This can be done by inserting 1k or so resistors into the relevant 68008 socket pins (there are two ground pins which helps). The Qubide should be set to the address of the ROM slot, $0C000. If the GC does not start, you may indeed have a power supply problem but if so it is to be found in the power supply 'brick'. Also, it is possible that a line going from the QL expansion port to the Qubide through-port is missing or has somehow failed. The missing line is a candidate in case you are using one of the pre-production Qubides (there seem to be one or two floating around!), these look slightly different than the production version - they have a gray PCB and are slightly bigger. Nasta
