Updates

Anyone who hesitated to build my Universal LROS/AROS Development Board, (SINCUS NEWS, Nov. 1984), because of the cost may want to look again. Although it can run with 2764 EPROMS (or 8264 EEPROMs, if you’re rich) its real power is shown when it’s run with 6264 RAMs.

In the LROS mode, you can load in: the Spectrum ROM code and have a Spectrum emulator and even modify the Spectrum code!

In the AROS node, you can load in HOT 2-AROS, and run it from the cartridge bank. (Ray Kingsley had no objection to selling me a tape of the code.)

It will also be useful in determining how to switch some of your favorite prograns to EFROM cartridge. (In coming months, we may get around to showing a neat trick that will often allow it to be done with little pain.)

In any case, the 6264LP-15 RAMS can be obtained for only about $13 each (you’ll need two) from Microprocessors Unlimited, 24000 South Peoria Ave.. Beggs, OK 74421. Shipping is extra and they take Mastercard and VISA. Now that the chips only cost about a third of what they did a few months ago, the time is right!

Last time, I mentioned that my “Extra Simple Spectrum Emulator” could be built either on a cartridge or on a board plugged to the rear connector. This is true, but if you build it as is to the rear connector. it will prevent any other cartridge from working properly, should you plug one into the cartridge port.

If you include a switch to disconnect the ROSCS signal and put a pullup resistor on pin 20 of the Spectrum ROM, you should be able to disable the Spectrum ROM by opening the switch. Keep the wire lengths as short as possible! Now the cartridge will work.