Search found 455 matches

by carlsson
Fri May 15, 2020 2:44 pm
Forum: General CreatiVision forum
Topic: Where could you buy a Creativision?
Replies: 24
Views: 22435

Re: Where could you buy a Creativision?

At the moment, the Royal Swedish Library (KB) has opened their magazine search engine as a benefit to all bored, self-isolating people. I've made a number of searches on topics that otherwise are near impossible to find information on the Internet, but it turns out the magazine archive is full of in...
by carlsson
Wed Apr 29, 2020 9:23 pm
Forum: Off-topic
Topic: Archimedes
Replies: 4
Views: 3212

Re: Archimedes

For a second I thought about the Socrates, which actually is a VTech product. Hey, in the dark all ancient Greeks look the same!
by carlsson
Wed Nov 21, 2018 11:01 am
Forum: Other VTech systems
Topic: Colecovision Module
Replies: 9
Views: 5228

Re: Colecovision Module

Great write-up! I'm forgetting, do the Salora branded game cartridges say Manager somewhere on the screen instead of Laser 2001 or CreatiVision? From what I understand, quite a bit of the interior electronics in Salora products were manufactured elsewhere (e.g. Siemens, Luxor) and possibly just asse...
by carlsson
Tue Mar 27, 2018 10:45 am
Forum: Other VTech systems
Topic: Great TMS Video Chip Demo
Replies: 12
Views: 8106

Re: Great TMS Video Chip Demo

That the TI VDP was worked on in 1977-78 is interesting as the GI STIC is of similar lineage and it sometimes is claimed one was inspired by the other. Of course we also have Atari, to a lesser extent Commodore and a bunch more hardware developers around the same time. In reality all of them probabl...
by carlsson
Fri Mar 23, 2018 2:36 pm
Forum: Other VTech systems
Topic: Great TMS Video Chip Demo
Replies: 12
Views: 8106

Re: Great TMS Video Chip Demo

Nice documents, and cool game. When Karl Guttag writes they've had fully functional VDP's for 2.5 years by April 1981, does he mean the original 9918 without bitmap mode etc? As for the picture quality, would that be due to what happens once you feed its signals to a RF modulator, something TI avoid...
by carlsson
Wed Mar 14, 2018 2:24 pm
Forum: Games programming
Topic: [cc65]How can I redefine characters and use colors?
Replies: 10
Views: 6040

Re: [cc65]How can I redefine characters and use colors?

Very good questions! Actually I copied that bit of code from Kurt's Titanic demo. In his comments he mentions the BIOS routine VDP_Regwrite at $FE1F: BIOS_VDP_Regwrite = $FE1F ; this is a short subroutine which writes the contents of a into VDP register x. It can also be used for initializing the re...
by carlsson
Tue Feb 27, 2018 11:03 am
Forum: Games programming
Topic: [cc65]How can I redefine characters and use colors?
Replies: 10
Views: 6040

Re: [cc65]How can I redefine characters and use colors?

I believe you need to set up the VDP vectors at $BFF0. I used these values previously: .byte $00 ; VDP 0: External video off, M2=0 .byte $A2 ; VDP 1: 16K mode, Screen not active, Generate interrupts ; M1=0, M3=0, Sprites = 16x16 unmagnified .byte $04 ; VDP 2: Pattern Name Table = 04 * $400 = $1000 ....
by carlsson
Tue Feb 27, 2018 10:52 am
Forum: Homebrew software and hardware (excluding games)
Topic: [SOLVED][VDP] What are the two bytes that have to be written into the VDP status address?
Replies: 4
Views: 3258

Re: [VDP] What are the two bytes that have to be written into the VDP status address?

You add $40 to indicate the address is set up for writing, or $00 to indicate it is set up for reading.

This doc is for the Spectravideo but is has the same type of VDP, see Address Register: http://samdal.com/svvideo.htm
by carlsson
Tue Jun 27, 2017 9:57 am
Forum: Other VTech systems
Topic: Great TMS Video Chip Demo
Replies: 12
Views: 8106

Re: Great TMS Video Chip Demo

True, we have discussed that before and the likelyhood that one and the same manufacturer - whoever it was - had several reference designs based on the TI custom chipset but with different CPUs attached to it, of which Coleco went with the Z80 design and the 6502 design was left for VTech to acquire...
by carlsson
Mon Jun 26, 2017 10:34 pm
Forum: Other VTech systems
Topic: Great TMS Video Chip Demo
Replies: 12
Views: 8106

Re: Great TMS Video Chip Demo

Regarding the VDP, I read the other day that supposedly it was designed by Milton Bradley (the toy/game company) to be used in a 16-bit video game manufactured by Texas Instruments. It is not clear what is fact and what is fiction, but the gospel is that TI said "fool you!" to MB, grabbed the design...