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<DIV>How many ROMs could this hold at a time?? Was there any space available for SRAM?</DIV>
<DIV><BR>Cheers</DIV>
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<DIV>Pete</DIV>
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<DIV>Dr Peter Craven (MBBS Uni. of Qld) <BR>877 Wynnum Rd</DIV>
<DIV>Cannon Hill</DIV>
<DIV>QLD</DIV>
<DIV>Australia 4170</DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">----- Original Message ----<BR>From: Pete Turnbull <pete@dunnington.plus.com><BR>To: bbc-micro@lists.cloud9.co.uk<BR>Sent: Thursday, 8 November, 2007 6:34:26 AM<BR>Subject: Re: [BBC-Micro] ROM / RAM boards...<BR><BR>On 07/11/2007 17:08, Rob wrote:<BR>> On 07/11/2007, Jules Richardson <<A href="mailto:julesrichardsonuk@yahoo.co.uk" ymailto="mailto:julesrichardsonuk@yahoo.co.uk">julesrichardsonuk@yahoo.co.uk</A>> wrote:<BR>>><BR>>> I just need the least painful route (which probably rules out the ROMEX board<BR>>> as I really can't be bothered cutting wires and soldering to a new machine) so<BR>>> adding some more expansion capability. I'm leaning toward the Sidewise boards<BR>>> as one of those has all its pins bar one, unless someone thinks otherwise...<BR><BR>> I have no experience of the Aries offerings, but I've still got
a<BR>> sidewise board (bought new 25 years ago..) and it's definitely pretty<BR>> simple.<BR><BR>> Socket 15 on the sidewise is split (optionally, set a link) into two<BR>> 8K sockets into which you can put one or two 8K SRAM chips. Another<BR>> link enables writes to that socket. ATPL chose to use the "any write<BR>> access hits the RAM whatever the currently selected ROM" method, so<BR>> you can just *LOAD romfile 8000 and it works. Can be iffy with some<BR>> protection schemes though, so there's a link to disable writes. I<BR>> (and most other serious users I imagine) took this out to a switch on<BR>> the back, (along with, I think, the 8K/16k switch, because you could<BR>> disable a corrupt ROM by swapping out the bottom 8K!)<BR><BR>I agree. The ATPL Sidewise was the Rolls Royce of sideways ROM boards. <BR> I have two, and wired a switch -- actually a 3-position
single-pole <BR>double-throw with centre-off -- so that I can have the sideways RAM <BR>write-protected, write-enabled, or disabled. Being able to disable it <BR>is particularly useful because the RAM is normally mapped to the <BR>highest-priority slot. However, on one of the boards, I just re-mapped <BR>it to a lower slot number.<BR><BR>-- <BR>Pete Peter Turnbull<BR> Network Manager<BR> University of York<BR><BR>_______________________________________________<BR>bbc-micro mailing list<BR><A href="mailto:bbc-micro@lists.cloud9.co.uk"
ymailto="mailto:bbc-micro@lists.cloud9.co.uk">bbc-micro@lists.cloud9.co.uk</A><BR><A href="http://lists.cloud9.co.uk/mailman/listinfo/bbc-micro" target=_blank>http://lists.cloud9.co.uk/mailman/listinfo/bbc-micro</A><BR></DIV><BR></DIV></div><br>
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