Search found 22 matches

by nippur72
Thu Mar 24, 2022 4:33 pm
Forum: Software
Topic: Emulation questions
Replies: 132
Views: 93414

Re: Emulation questions

@username@:

the file "Creativision Keypad Matrix.pdf" reports SHIFT to be selected via PA[0] and CTRL via PA[1], but on the source code (pia_intf.c) it's the opposite
by nippur72
Wed Mar 23, 2022 9:22 am
Forum: Homebrew software and hardware (excluding games)
Topic: FPGA implementation
Replies: 1
Views: 161

Re: FPGA implementation

I've started working on the project and have written the first raw version (which of course isn't working) as the result of looking at the schematic, placing the chips and connecting them together (all virtually). I've published it on a GitHub repo here: nippur72/CreatiVision_MiST If you want to giv...
by nippur72
Wed Mar 23, 2022 7:29 am
Forum: Hardware
Topic: where the /ROMR signal is originated?
Replies: 4
Views: 271

Re: where the /ROMR signal is originated?

ok thanks, so if I've understood correctly /ROMR is used by an external cartridge when it wants to use the BIOS ROM; it does that by sending back the /ROM0 signal. If instead the cart wants to use its own ROM then /ROMR is just kept high for all the time. This also implies that when you turn on a Cr...
by nippur72
Tue Mar 22, 2022 10:55 am
Forum: Hardware
Topic: where the /ROMR signal is originated?
Replies: 4
Views: 271

where the /ROMR signal is originated?

I am not able to locate where the "ROMR" signal that goes in the 2K BIOS ROM is originated (datasheet, Circuit 1.pdf).

Any clue ?
by nippur72
Mon Mar 21, 2022 12:44 pm
Forum: Introduce yourself!
Topic: Hello from Italy!
Replies: 21
Views: 1084

Re: Hello from Italy!

the keyboard layout is similar to the Laser 310, but not the same, it's missing two keys on the right. The orange color of the keys is most likely inspired to the rubber keyboards they used to have, but they dropped it in the Laser 310 for a more standard brown or white (VZ300).
by nippur72
Sun Mar 20, 2022 8:52 am
Forum: Introduce yourself!
Topic: Hello from Italy!
Replies: 21
Views: 1084

Re: Hello from Italy!

I don't have a 200, but wonder if the expansion port would by chance have anything in common with the 500, or if the compatibility between different Laser products only went as far as the software side. the 200 and 500 share the same basic design as the 500 was meant to be an improvement of the 200...
by nippur72
Sat Mar 19, 2022 7:23 am
Forum: Homebrew software and hardware (excluding games)
Topic: Creativision MegaSDCart
Replies: 75
Views: 3093

Re: New hardware coming soon...

Mobsie wrote:
Fri Mar 18, 2022 5:50 pm
That’s cool, can you share your apple1 photos? As an Apple freak you would made me happy 😎
I don't have an A1 myself, but Claudio (the hardware designer in our team) has a replica, here are two videos showing our experiments:
by nippur72
Fri Mar 18, 2022 5:34 pm
Forum: Homebrew software and hardware (excluding games)
Topic: Creativision MegaSDCart
Replies: 75
Views: 3093

Re: New hardware coming soon...

yes such parts are very hard to find :-( I love the Apple1 but honestly there's not much you can do with it, the display is too limited IMO, you can't write games or things like that. We have build a TMS9918 video card expansion for it, but in the end you are just recreating a Creativision LOL Anywa...
by nippur72
Fri Mar 18, 2022 1:20 pm
Forum: Homebrew software and hardware (excluding games)
Topic: Creativision MegaSDCart
Replies: 75
Views: 3093

Re: New hardware coming soon...

thanks for the explanation, interesting design. There are similar projects that halt the CPU via the 6502 "RDY" pin and write to the bus, but I guess on the CV it's not possible because such pin is not connected on the mainboard. In my project with the VIA chip I get loading times around 3-4 seconds...
by nippur72
Fri Mar 18, 2022 10:59 am
Forum: Homebrew software and hardware (excluding games)
Topic: Creativision MegaSDCart
Replies: 75
Views: 3093

Re: New hardware coming soon...

very interesting! Can you share more details? How do you load data from Arduino to RAM? I'm doing a similar SD card project for the Apple1 where I use a VIA6522 to talk with the Arduino, because I assumed the Arduino isn't fast enough to write to the data bus.