Path: utzoo!attcan!uunet!munnari.oz.au!diemen!tasman!steveh From: steveh@tasman.cc.utas.edu.au (Steven Howell) Newsgroups: comp.sys.amiga.hardware Subject: Re: a500 Ram info Message-ID: Date: 13 Jan 91 22:44:14 GMT References: <9101120311.AA01049@cwns9.INS.CWRU.Edu> Sender: news@diemen.utas.edu.au Lines: 23 I am intending to build a series of memory expansion boards to suit amiga's. However they must be a minimum of 2 megs each. I need info on the a501 memory expansion capabilities, in order to construct a circuit to suit. I intend on selling the boards at all levels, with an entry price of $50AU for 0k thru to to $250AU for 2Meg version. It also includes clock and a touchon/touchoff memory disable switch +backup battery. The boards will contain simm sockets and current limiting data/address resistors. Power on smd led. battery and clock. I would like to build an 8meg board for the a501, however, custom firmware may be required to ensure effective bank switching. This would have to be done by an amiga programmer that is farmiliar with the amiga's memory maps and access technique. Otherwise a simple software patch could be created and loaded buring startup. Anyway. If you have any idea's, I would be very interested in hearing them. I have completed the schematics and board layouts for most boards, but can be simply changed at the press of a key, so any idea's let me know. Hopefully I will send out a heap for beta testing to those who express interest in manufacturing good idea's at an everybody's price. See how we go ay' Steve h