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Fox-1 / mnx

Member Since 22 Jun 2003
OFFLINE Last Active Today, 6:15 AM

Topics I've Started

1050 RESET mod

Sat May 5, 2012 1:29 PM

After many years I finally modded my main 1050 to let it run on an "AT" power supply. I mounted 2 PC-style 4-pin molex connectors in the back of the case so I can daisy-chain the power to other 1050's (not modded yet). When at it I also redid all the ugly wiring (Speedy switches, write protect, etc) and removed the external speed potmeter since I don't use it anymore these days.

Seems to work as it should on both AC and DC but when DC powered the on/off switch doesn't work anymore (which is as expected). The only time I need to power it off is when programming the Speedy to disable itself. After that, the only way to re-enable it (reset) is to power off/on.

Once I had a doc to add a RESET button to the Atari 1050 but can't find it anymore. The button was meant for stock 1050's and I don't know if it also works on Speedy upgraded 1050's.

Anyone have this doc? Or maybe other ways to do a RESET with a button?

Simple System Check

Sun Apr 22, 2012 12:53 PM

Don't get too exited...

This is just a very basic BASIC thing that does some simple system checks like revision info, GTIA check, audio output and things like that. For a much better tool you should get SI.

Main purpose for me is to check what's in an XE, like what BASIC/O.S. revision it has and if it has the good or the bad GTIA and if the basic functions of pokey are working. It had to work on a system with no keyboard attached so the few available options can be selected with a joystick in either port #0 or #1. A connected mouse will probably cause issues.

Just make it autorun from DOS when booted.

Attached File  SIMSYS.BAS   3.53K   24 downloads

Attached File  simsys.png   9.38K   59 downloads

POKEY keyboard scanning

Tue Feb 7, 2012 8:41 PM

Confirmation wanted :-)

I want to emulate some shift+key combo's with logic gates, like 74LS/74HCT and was under the impression I need to delay the actual key press a little bit after shift was pressed to get it to work.

After reading the Altirra hardware manual ( chapter 5.8 ) I'm not so sure anymore if I have to delay anything at all.

Does setting the "shift" bit together with another key's bit, simultaneously, give me the right result?

C060472 delay

Mon Jan 30, 2012 12:41 PM

I never really had any problems with XL's. If there were any they were always related to (memory-)upgrades. But what about that thing called "delay line" ? (U13 in 600XL)

Just came across a 3rd XL (stock) with a broken one. 2 Were 800XL's, and now this 600XL. Is there a way to not use this component by using another way to create the delay? I don't even know what's in it (a coil?).

What were they thinking when...

Tue Jan 10, 2012 1:16 PM

Sometimes I wonder what was on people's mind when coming accross things, like I did this evening when a pulled a random 800XL from the stack and opened it.


Attached File  800XL Trash Can 2_S.jpg   69.76K   142 downloads


I'm sure there must be lot's of other (and worse) examples out there so the question is: what kind of surprises were you facing when opening some Atari stuff?

I want your pictures. (just Atari stuff please, no other systems)

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