Search found 379 matches
- Sat Nov 05, 2011 6:40 am
- Forum: Development
- Topic: Houston, we have an image!
- Replies: 135
- Views: 82937
Houston, we have an image!
As some of you may have read , I'm having a go at creating an ULA replacement, using an XC9572 CPLD. Tonight I made another important step forward: I produced an image on my TV! First I added some logic for software Vsync control, but since that isn't (directly) used for any ULA output pin: how to t...
- Wed Nov 02, 2011 3:33 pm
- Forum: Software
- Topic: If it wasn't Life what was it?
- Replies: 7
- Views: 4851
Re: If it wasn't Life what was it?
Try Google next time... If you just type "game" and "life" in its search field, 1st page of results already has what you wanted.prolog wrote:I did try a search
- Wed Nov 02, 2011 12:20 am
- Forum: Software
- Topic: If it wasn't Life what was it?
- Replies: 7
- Views: 4851
Re: If it wasn't Life what was it?
Your memory isn't wrong: en.wikipedia.org/wiki/Conway's_Game_of_Life
- Tue Nov 01, 2011 6:39 pm
- Forum: Emulators
- Topic: My new emulator
- Replies: 43
- Views: 36293
Re: My new emulator
Let me give an example: a binary ripple counter. It consists of a number of bits (flip-flops) representing a binary number. On a clock transition (for example high -> low) the lowest-numbered bit toggles once (1 -> 0 -> 1 -> 0 -> 1 etc). That bit is used as clock input to the next bit, so that next ...
- Tue Nov 01, 2011 4:12 pm
- Forum: Emulators
- Topic: My new emulator
- Replies: 43
- Views: 36293
Re: My new emulator
I'm considering whether it is sufficiently accurate for all communications to propagate only with the clock line, which would instantly reduce me to a fixed 6.5m messages/second and suggest simpler runtime processing. Basically a machine like the ZX81 is a state machine. It has a certain state, and...
- Tue Nov 01, 2011 3:44 pm
- Forum: Sinclair Misc
- Topic: Introducing myself (RetroTechie)
- Replies: 7
- Views: 5203
Re: Introducing myself (RetroTechie)
For MSX, individual parts are much more complex than in ZX81 / Spectrum systems, but overall system setup is much more straightforward / easy to understand (slot mechanism & memory mappers being the exception). For example video: it's a TMS9918 compatible (or V9938 for MSX2) stuck onto I/O ports 98/...
- Tue Nov 01, 2011 5:43 am
- Forum: Sinclair Misc
- Topic: Introducing myself (RetroTechie)
- Replies: 7
- Views: 5203
Re: Introducing myself (RetroTechie)
As ZX81 user/lover, don't even know what an MSX is? :shock: please GO HERE! NOW! The 13 MHz Xtal I'm using is just the clock source, I divide by 2, this gives the 6.5 MHz clock that is input to the ULA (replacing the 6.5 MHz ceramic resonator). Reasons being: I've got 10 pcs of those 13 MHz Xtals (r...
- Tue Nov 01, 2011 3:12 am
- Forum: Hardware
- Topic: Rather basic bus question
- Replies: 15
- Views: 7784
Re: Rather basic bus question
So when designing a circuit I need to ensure that: each line has only one outputting device physically attached; that it has only one logically attached either because some can float when appropriate; that I've found a route to wired-or; or as in the ZX80 (and, off topic, presumably the Spectrum?) ...
- Tue Nov 01, 2011 2:27 am
- Forum: Sinclair Misc
- Topic: Introducing myself (RetroTechie)
- Replies: 7
- Views: 5203
Introducing myself (RetroTechie)
Hello all, Registered today @ this forum since I've been following posts here for a little while, and thought it was time to change from passive to active participation... :) My general background is best described in this post on MSX.org forum: http://www.msx.org/forumtopic9106.html And for some ti...