firstname.lastname@example.org wrote: > > >Ultimax mode to map into the C64. This is why it needs the extra cable > >attached to the HIRAM signal in the C64 to allow access to RAM at $e000. I > I never new it needed an extra cable (never having seen a RAMlink in the > physical) > > >There once was a thread in comp.sys.cbm about this cartridge, called >"epyx > >fastload internals" or something like that. I think parts of the ROM >are > >mapped into I/O space, and accesses to I/O space trigger a circuit that > maps > >in ROML for a certain time. After a timeout the ROM vanishes again. >Quite > tricky :-) > Indeed very tricky, I did a search for it but could find the reference. Does > anyone have this article? Here it is. Somehow that damn Google crippled the old Deja archive even more, old postings are completely gone :-( Maybe you can find the rest of the thread in CKB: http://retrobits.com/ckb/ Nicolas From: john/lori <email@example.com> Subject: Re: fastload cartridge internals? Date: 20 Apr 1999 00:00:00 GMT Message-ID: <371D45BF.firstname.lastname@example.org> Content-Transfer-Encoding: 7bit References: <email@example.com> <eSF#DC4i#GA.firstname.lastname@example.org> Content-Type: text/plain; charset=us-ascii X-Complaints-To: newsabuse@remarQ.com X-Trace: 924665268 CUJNRDC/I2B77CFD3C usenet57.supernews.com Organization: Posted via RemarQ, http://www.remarQ.com - Discussions start here! Mime-Version: 1.0 Reply-To: email@example.com Newsgroups: comp.sys.cbm > Yes, it's available in my notes, aftr having just opened up an Epyx "Fast > Load" cartridge to find out what goes on inside. thanks! I opened mine up and traced the connections but had not started to analyze it yet. I found the same as you, except I have /ROML driving the capacitor node throught the sixth buffer (/ROML drives both pins 11 and 1, and pin 10 is tied to pins 4,6,8, the cap', and /EXROM) And mine's got a 5.6K pullup on /OE (ROM 22) Expansion Port 7407 ROM --------- ---- ---- +5 VDC --- o I I < 5.6K < i--- < I I\ < I -------i I \ I I I I \ I I -I/O2 I------------I /-----o-----I -G I 10 13 I / 12 I 22 I I I/ I I I I I I I\ I !--- I I \ I I I \ I -ROML I-----o------I /-----! I 11 I 1 I / 2 I I I/ I I I I I\ I I I \ I I I \ I i------I /-----i I 11 I / 10 I I I/ I I I I I\ I I I \ I I I \ I -I/O1 I-----o------I /-----o I 7 I 5 I / 6 I I I I/ I I I I I I I\ I I I I \ I I I I \ I I i------I /-----o I 9 I / 8 I I I/ I I I I I\ I I I \ I I I \ I -RESET I------------I /-----o I C 3 I / 4 I I I/ I I I I I -EXROM I---------------------o I 9 I -------i I + I ----- 0.47 ----- uF I I I o GND - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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