Re: Jeri board MUST HAVES!

From: Marko Mäkelä (
Date: 2001-07-24 18:04:38

On Tue, 24 Jul 2001, Steve Judd wrote:

> Just kidding...

Well, I could announce some hardware I'm working on.  The Vic-20 RAM/ROM
cartridge is still unfinished, but the good news are that a friend of mine
is able to assemble some prototypes.  It's no easy task, since the pins of
the Flash ROM and of the logic array are at a 350 micrometer grid.  The
prototype boards have no solder-resisting mask, it's just plain copper. I
hope that we get the first prototype working by the end of the year
(initially I thought it would be during April or May).

A related note: there's a cheap PCB manufacturing shop in Bulgaria,
reachable via or They
should be able to manufacture two-sided boards at 200 micrometer
resolution (0.2 mm line widths and gaps), directly from Eagle files.  The
light edition of Eagle is free for non-profit use, and it is available not
only for Windows, but also for Linux, from Cadsoft's home page.

The second piece of hardware I'm working on is a device that plugs into
the cassette port.  It features an Atmel AT90S2313 microcontroller (128
bytes of RAM and 2kB of ROM) running at 4 MHz and a MAX232 line driver.  
This device will both emulate the tape protocol and implement a custom
protocol for faster file transfers between an RS-232 equipped computer and
any 8-bit Commodore computer.  It fits on a single-sided circuit board
with no jumper wires (well, two are required for the CTS and RTS signals
on the DB9 connector).


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