Re: [CommodoreOne] Kernal 1541

From: Ruud Baltissen (Ruud.Baltissen_at_abp.nl)
Date: 2001-08-03 08:06:01

Hallo Raymond and everyone else,

Your idea of adding two 32KB*8 SRAMs to a 1541-II intrigued me so yesterday
I made a small SCH so others can make this change as well.

Warning: this SCH hasn't been built or tested yet !!!

Beside the two SRAMs, it only needs two additional ICs: a 74LS139 and a
74LS00.

First we must select/enable RAM #1 ($0000/7FFF) and we need addressline A15
for this. On the other hand it needs to be disabled the moment one of the
6522's is selected. So we OR (U2b) A15 with a signal created by NANDing
(U1d) the two 6522 CS-signals. As you can see I used a 139 to emulate the
OR-gate.

Next step is to select the original (EP)ROM. On the 1541-II this is done by
enabling/selecting it by an inverted addressline A15. We add two AND-gates
in row to it. One AND-gate (U4b) is the second gate of the onboard U1
originally used to select the 2016 SRAM. The other one (U4a) is the unused
first gate of the onboard U1. The second input of U4b is pulled to +5V
through a resistor. A switch can negate this input and thus disable the
EPROM. The EPROM also needs to be disabled during a write. This is done by
ANDing (U4a) the R/W signal with A15.
Remark: The leftover NAND-gate U1C could replace U4b and the onboard
invertor.

RAM #2 needs to be enabled during a write to $8000/FFFF. This is done by
NANDing (U1b) A15 and the inverted R/W-signal. U1a is used to invert R/W.
The second input of U1a enables us to disable R/W and thus enabling us to
perfrom read- or write-operations when accessing $8000/FFFF.

I hope you can use this design.

   ___
  / __|__
 / /  |_/     Groetjes, Ruud
 \ \__|_\
  \___|       http://Ruud.C64.org








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`
end


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