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Member Since 21 Dec 2010
OFFLINE Last Active Oct 21 2018 10:06 AM

#3641982 Is there 80col. only hardware available right now?

Posted by 19rsn007 on Thu Dec 1, 2016 3:37 PM

the IC used in the XEP 80 is still available on ebay.


shouldn' t be too hard to reproduce the XEP80 :D

#3493812 Sharp PC-7000 added to my collection - Intel 8086

Posted by 19rsn007 on Mon Apr 18, 2016 3:33 PM

Good point OS!


pc's were mostly business machine back in the day.

A C64 could do 80 colums (both in soft and with hardware add-on btw) the Atari could do 80 columns with the XEP80.



when it comes to gaming, I don't think any system killed the gaming!

Users kill things, not systems..... IMHO

#3493388 Sharp PC-7000 added to my collection - Intel 8086

Posted by 19rsn007 on Mon Apr 18, 2016 1:28 AM

So normally I'm not into buying old pc stuff, but I couldn't resist this bargain.

It was offered as NOT WORKING, so the price was low.

After picking it up and arriving at home, I took a look at it and the first thing I noticed was the HD floppy in drive B (the drives are DD, so that won't work and even if the HD floppy is formatted as DD, it's unreliable as sh*t)


The other floppy (the dos boot floppy) didn't have any label on it so I couldn't tell if it was a hd or dd floppy.
I decided to just make a new boot floppy on a known good dd flop I had, but I had to find a way to get the drives from the sharp working in an old desktop pc.

I managed to do that and make a new floppy and the sharp booted that nicely.

But then a new problem came to light....the thing was unstable, crashed randomly and gave all kinds of errors.

So more troubleshooting !!

Last night I tested the DRAM (4464 = 64x4) and found 5 bad chips.

The sharp is playing along nicely now, but with less ram.
I am gonna replace the bad ram chips sooner or later so the ram is maxed out again.


Almost 31 years of age, but the sharp pc-7000 is still up and running!


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#3348187 What did you buy today?.........

Posted by 19rsn007 on Mon Oct 19, 2015 6:09 AM

man I'd love to do one of those "1 minute of free shopping" in there :P

#3040858 Mockup - Aquarius BEAMRIDER

Posted by 19rsn007 on Sun Jul 27, 2014 1:02 PM

Hey, that looks pretty good!  The sprites could look more detailed with some of the characters in the Aquarius character set beyond the "bloxels", but Beamrider would be a good choice for the Aquarius, and this certainly looks like a promising start.


Here are some quick Beamrider sprites that I mocked up, to give some idea of what can be done with the other characters in the set:





Hey Jay,


wow those look pretty cool !

The aquarius has been a system I chased for years, and when I finally got hold of it with a 16k rampack (which wasn't working like it should) I couldn't wait.

That 32k rampack of your is certainly a thing I would have bought if I wasn't too technical :D

I am much more of a hardware guy, but this beamrider project is something I wanna do.

#3040709 Mockup - Aquarius BEAMRIDER

Posted by 19rsn007 on Sun Jul 27, 2014 8:47 AM

Here's a little something I've started.


Really hard, since all the graphics are CHARSET based





I'll keep working on this until something playable has rolled out, and then I'll be releasing a public demo

#2963560 New addiction....BEAMRIDER

Posted by 19rsn007 on Sun Apr 6, 2014 3:52 AM

hey people,


I just made a deal on a non working intellivision.

I got as much info on the none working thing I could, and it seems like it's a pretty easy fix.... (replace a cable)


Sow now I was looking into emulation of the thing and I played some games....pretty funny.


I now have a new addiction.......BEAMRIDER :D

What a funny but challenging game that is.

Can't wait to get the thing fixed and try to get hold of a beamrider cart :D

#2912779 pixelpast.com site gone ?

Posted by 19rsn007 on Fri Jan 24, 2014 8:30 AM

hey thanx.... :)
I just had the wrong  URL :P


Google pointed me to that right before I saw there was a reply :)

#2865046 check free memory on an aquarius

Posted by 19rsn007 on Mon Nov 11, 2013 5:53 PM

the most rotten lack is the fact that the emulator doesn't have a debugger and we don't know the full ASM instruction set of the aquarius.

An ASM debugger and built-in assembler in an aquarius emu would be nice, but I am affraid it's never gonna happen.

#2864956 check free memory on an aquarius

Posted by 19rsn007 on Mon Nov 11, 2013 3:46 PM

hey voltron.


You are one step ahead of me :P

I just started doing Aquarius since tis afternoon :P

I played around with it earlier, but this is the first time I am actually trying to get output other the



20 GOTO 10


I have an aquarius for about a month now...... (after hunting it down for years)


The first thing I've done was create a demo.

Nothing fancy, but still it's cool.

I'll be looking more into the aquaius :)

#2864900 check free memory on an aquarius

Posted by 19rsn007 on Mon Nov 11, 2013 2:44 PM

hehe thanks for the help.

Forgot to mention I already found out how to do it again..... I remembered :P
I started doing some programming for my aquarius this afternoon.

So far, I've only done a simple color scrolling demo, but there is more to come :)

#2864585 check free memory on an aquarius

Posted by 19rsn007 on Mon Nov 11, 2013 5:43 AM

Hey people,


Can anyone help me?

I forgot the command to check the free memory on my aquarius.

It was something with print ($) fre or free, but I can't remember!!

#2860300 time well spend...

Posted by 19rsn007 on Mon Nov 4, 2013 3:32 PM

I got a day off from work, so I decided to challenge myself for a game of columns on my sega genesis.

The genny is still powered on, but I paused the game to visit a friend.


This is the first game started, and still haven't finished it......(no game over yet)

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#2748819 Gameboy Flascart

Posted by 19rsn007 on Mon May 6, 2013 3:21 PM

I was talking to a friend of mine yesterday and he was looking for a way to play roms on his gameboy (color)
I started searching for my gameboy games, took one that I wasn't playing and took it appart.
A maskrom and a mapper/bankswitching chip were there and I searched the internet some more, looking to find the maskrom pinout and the the cartridge pinout.
I managed to find it, so I took my multimeter and checked if it was correct.....it was :)

This afternoon I desoldered the maskrom and soldered some wires in it's place....as you can see below:

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After a short break (my wife finished diner) I finished the soldering and made sure the wires would stick to the board by putting some hot glue on them

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To test the thing I took an old pc motherboard with an eeprom as bios chip and flashed it with a gameboy game.


The gamyboy I am testing it on is a gb advance SP.
Classic gameboy games stick out a lot, but this one sticks out a bit more because the cart is extended with a pcb with an IC Socket so the eeprom can be inserted.

I want it to run on regular flasroms in the near future and all I need to do now is build a programmer for the thing so roms can be changed via the carts directly

#2718343 Colecovision bank switching

Posted by 19rsn007 on Tue Mar 19, 2013 12:09 AM

Yeah I have looked at it, but I am a hardware enthousiast and I wanted to see if I could build an SRAM cartridges that is programmed via my pc when it's interfaced with an arduino (using flipflops to connect the extra adresslines)