ncoplin@orbeng.com 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 <henk@spamsux.doitnow.com>
Subject: Re: fastload cartridge internals?
Date: 20 Apr 1999 00:00:00 GMT
Message-ID: <371D45BF.7193@spamsux.doitnow.com>
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> 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
-
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