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Marko Mäkelä’s
old computers:
Internal Memory Expansions for the Commodore 64 and Commodore 128
In 1987, the Finnish Mikrobitti magazine
published Pekka Pessi’s plans for an internal
256-kilobyte memory expansion for the Commodore 64. In 1994, Marko Mäkelä translated the plans into English, made
minor improvements to the design and adapted it for the Commodore
128 as two independent expansions: doubling the number of MMU banks from 2 to 4, and
enlarging each bank from 64 to 256 kilobytes as in the Commodore 64
memory expansion.
These memory expansions are supported by the cbmlink networking suite and the
software that is available on this page. If you know of other
software supporting these memory expansions, please let me know.
If you would like to play around with the memory expansion without
building the hardware, please have a look at x64 in VICE 1.19.
Download
- Document: Memory expansions for the Commodore 64
(256 kilobytes of internal memory)
- memory-c64.pdf
- Typeset in PDF
- memory-c64.tex
- Source code for LATEX 2.09
or LATEX2ε
- Document: Memory expansions for the Commodore 128
(256, 512 or 1024 kilobytes of internal memory)
- memory-c128.pdf
- Typeset in PDF
- memory-c128.tex
- Source code for LATEX 2.09
or LATEX2ε
- Software for the Commodore 64 by Pekka Pessi
- ros-v1.sfx
- Source code for RAM disk and some other utilities
- util256.sfx
- RAM disk, miscellanous utilities and some source code
- Software for the Commodore 128
- piaglobe.asm
- Source code of a program that precomputes images of the globe
and then displays a smoothly rotating globe on the screen of a
Commodore 128 with 512 or 1024 kilobytes of internal memory, written
by Marko Mäkelä. The code and data for
drawing images of the globe have been disassembled from a program
written by Georg Schwarz. The source code
can be compiled with DASM 2.12.04.
- piaglobe.128.prg
- A compiled version of the globe viewer for systems where the
PIA
controlling the memory banking resides at
$dfc0.
- piaglobe.128.d7c0.prg
- A compiled version of the globe viewer for systems where the
PIA
controlling the memory banking resides at
$d7c0.