💾 Archived View for mirrors.apple2.org.za › archive › apple.cabi.net › FAQs.and.INFO › Re__][+_ROM_C… captured on 2023-04-26 at 16:08:24.
⬅️ Previous capture (2023-01-29)
-=-=-=-=-=-=-
Subject: Re: ][+ ROM Card From: dempson@actrix.gen.nz (David Empson) Date: Fri, Oct 23, 1998 23�2 � Message-id: <1dheycg.1puqlve20s0a8N@dempson.actrix.gen.nz> Terence J. Boldt <ter@interlog.com> wrote: > >Ummmmm....Wait a minute...can you do that with a //e? I thought the ROM > >cards were intended to operate in Slot 0, which the //e doesn't have...?? > > > >I do remember working with one machine that had a ROM card...it was an > >Apple ][ with an Applesoft ROM card, which was kind of nice... > > > I have two of those ROM cards and some //e computers. Yes it does work in > any slot. You have to be rather careful if you have two of these cards installed (or one at the same time as the language card in slot 0 of a ][+), because they all use the INHIBIT signal to override the motherboard memory. If two of the cards are active at the same time, they will cause a data bus clash. I don't recall offhand whether they try to use the DMA IN/OUT chain to avoid conflicts, but even then they would only be fully safe if in adjacent slots. -- David Empson dempson@actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand