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!
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:
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:
SOLDERING WIRES IN PLACE
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
THIS IS THE CARTRIDGE WITH THE WIRES COMING OUT:
To test the thing I took an old pc motherboard with an eeprom as bios chip and flashed it with a gameboy game.
TIME TO TEST THE THING : http://youtu.be/oOfdjv1WqzE
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
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)