memory maker 64k

sjakie43 · Post by **sjakie43** » Wed Nov 10, 2004 7:47 pm

could someone help me out?

someone in holland is selling this item.

it has a yellow with black surface with red letters?

i could buy it but i am not sure.

regards

Dirk

sjakie43 · Post by **sjakie43** » Wed Nov 10, 2004 7:50 pm

This is a cartridge offcourse.

i am VERY curious about this item so ...
the url:

www.marktplaats.nl

a search.....and voila.

regards

Dirk

carlsson · Post by **carlsson** » Thu Nov 11, 2004 2:13 am

You wonder what it does and how it works? I think it has eight banks of 8K each (equals 64K), and then you can bank switch (map) regions of 8 or 16K into memory, either by manual or by software. Maybe it can switch larger amounts of memory and/or determine which address block to map into (BLK1/2/3/5), but it is hard to say.

sjakie43 · Post by **sjakie43** » Thu Nov 11, 2004 7:40 am

Thanks for your reply.

i just got an email that it it already sold

no bother

Dirk

hacky · Post by **hacky** » Thu Aug 30, 2007 1:16 pm

I bought such a nice 64 K cart a few month ago (from a dutch person).
The cart works great but I only have a durch manual.
There is a 2K Eprom on it and I don´t know for what it is good for...

Does anybody own an english or a german manual ?

Best regards from Berlin

carlsson · Post by **carlsson** » Fri Aug 31, 2007 5:31 am

Is it impossible to dechiffer Dutch text for you, as a German? If nothing else, Babelfish includes Dutch as one of its languages for a rough translation.

ruud · Post by **ruud** » Mon Sep 03, 2007 4:19 am

carlsson wrote:Is it impossible to dechiffer Dutch text for you, as a German? If nothing else, Babelfish includes Dutch as one of its languages for a rough translation.

Oder frage einfach die Niederländische Mitglieder dieses Forum :)
(Or simply ask the Dutch members of this forum)

tokra · Post by **tokra** » Sat Feb 12, 2011 8:35 am

Got such a memory expander myself recently, and still puzzled about the dip-switches. I found a picture here (last picture):

http://vic20.de/html/64k_karten.html

Does anyone have a manual or more information on this?

nbla000 · Post by **nbla000** » Mon Mar 07, 2011 4:25 pm

I've a similar cart, Memory Maker 32K without 2K rom.

This is my dip-switch table, I hope it could help you:

Code: Select all

=========================
|                       |
| Memory Maker 32K      |
|                       |
| Block/s     Switch/s  |
| 1          4/6 ; 5/6  |
| 1/2         2/3/4/6   |
| 1/3          3/4/6    |
| 1/5            6      |
| 1/2/5         2/6     |
| 1/2/3/5      2/3/6    |
| 1/3/5         3/6     |
| 2          2/4 ; 2/5  |
| 2/3          2/3/4    |
| 2/5            2      |
| 3             3/5     |
| 3/5            3      |
| 5            1 ; -    |
|                       |
=========================

tokra · Post by **tokra** » Mon Mar 07, 2011 5:17 pm

Hmm, I noticed mine can switch the 3K block (block 0) as well, but NOT together with block 5. Also I don't really understand your switch table. What does the ";" mean? Is it like an "OR"?

nbla000 · Post by **nbla000** » Mon Mar 07, 2011 5:31 pm

tokra wrote:Also I don't really understand your switch table. What does the ";" mean? Is it like an "OR"?

Yes OR, since I didn't have istructions for this cart, I wrote a test program to discover what it does but I don't know where is it now

leof · Post by **leof** » Sun Feb 12, 2012 2:35 am

I bought one of these 64k Memory Maker Packs for the VIC-20 I recently acquired. I have no idea how I can get the full 64k out of it. This far I could get:
6.655 bytes free
11.775 bytes free
19.967 bytes free
28.159 bytes free
Probably one or more memory chips are not working.
There's almost nothing to find on the internet about this little box.

Mike · Post by **Mike** » Sun Feb 12, 2012 5:37 am

Hi, leof,

welcome to Denial!

leof wrote:I bought one of these 64k Memory Maker Packs for the VIC-20 I recently acquired. I have no idea how I can get the full 64k out of it.

Simply put: you can't. The memory architecture of the VIC-20 is not capable of mapping in the 64K all at once.

BASIC requires a contiguous RAM range, big RAM expansions combine the internal memory from 4608 to 8191 with additional RAM at 8192 to 32767 (the so-called BLK1 .. BLK3), which gives you the maximum amount of 28159 bytes free for BASIC (this is off by 1 byte which is required by the interpreter to be 0).

Additionally, a RAM expansion can map in memory in the range 40960 to 49151, 'BLK5'. As this range is not contiguous with the internal RAM + BLK1..3, these two ranges cannot be used together for BASIC. But you can check its presense by poking different values in one address of the range, and getting the value back. BLK5 can be used for programs in machine language and softloading cartridge images.

Probably one or more memory chips are not working.
There's almost nothing to find on the internet about this little box.

Most probably your box is in perfect working order. Still one could ask what might be the use of sticking more than 32K (BLK1..3 + BLK5) + 3K (filling the gap between 1024 and 4095) into a RAM extender?

Your extender might provide for a banking solution, i.e. mapping different parts of its RAM into a certain address range of the VIC-20. That would finally make all 64K of your cart available. But this is not supported by BASIC, you'd have to access this from machine language.

Greetings,

Michael

leof · Post by **leof** » Sun Feb 12, 2012 5:55 am

Mike wrote:Your extender might provide for a banking solution, i.e. mapping different parts of its RAM into a certain address range of the VIC-20. That would finally make all 64K of your cart available. But this is not supported by BASIC, you'd have to access this from machine language.

Hi Michael,
Thanks for your clarification!
The expander says on the box it also has got 2k of ROM. Could that be the banking solution you mention?
I wonder if someone has got a manual for this cartridge.
Leo

Leeeeee · Post by **Leeeeee** » Mon Feb 13, 2012 11:59 am

Is the ROM image online anywhere?

Lee.