Search found 301 matches

by simon
Wed Sep 19, 2012 9:35 am
Forum: Hardware
Topic: New hardware revision?
Replies: 95
Views: 268748

Re: New hardware revision?

Sounds and looks interesting. I imagine how a aluminum case would look like. :)

For the hardware... I added some design files to the internal member area. So if you want a Kiwi let us get on the work. 8-)

Simon
by simon
Tue Sep 18, 2012 12:21 pm
Forum: Programming
Topic: SID dump file format
Replies: 33
Views: 119355

SID dump file format

Hello, available SID files come with an own player routine written for 65xx CPUs. Hence all PC based SID players emulate this CPU or even more parts of the C64. This approach is probably not the way to go as it needs too much computing power. To circumvent the emulation layer I used siddump from cov...
by simon
Tue Sep 18, 2012 7:21 am
Forum: Hardware
Topic: New hardware revision?
Replies: 95
Views: 268748

Re: New hardware revision?

Doing stuff with a SID (or any of the other programmable sound generator type chips of that era like the Atari POKEY or the General Instrument AY-3-8910) requires writing raw code whereas using an FM synthesis chip like the YM2151 or the OPL means you can probably just write something to play music...
by simon
Mon Sep 17, 2012 7:36 pm
Forum: Operating system
Topic: Porting EhBASIC to gcc?
Replies: 23
Views: 79131

Porting EhBASIC to gcc?

Hello,

as the syntax of EhBASIC's source code is not compatible with gnu-as, I use a cumbersome way to build a complete Basic binary. See http://www.ist-schlau.de/software.html#Basic. Maybe someone is interested in porting the syntax to gnu-as? :)

Simon
by simon
Mon Sep 17, 2012 7:18 pm
Forum: Hardware
Topic: Power supply
Replies: 18
Views: 54850

Power supply

Hello, the current design demands to supply 12V and 5V. A desktop power-supply which is strong enough to power all chips, floppy, harddrive, ... is expensive. What about supplying 12V only and use a voltage regulator for the 5V? But a 7V drop is not very good. :roll: What about a step down converter...
by simon
Mon Sep 17, 2012 6:16 pm
Forum: Hardware
Topic: Issues with the current PCB/design
Replies: 10
Views: 36549

Issues with the current PCB/design

Hello, as I told there are some issues with the current design I want specify here. ⋅ My symbol for the WD177x had a double counted pin. This resulted in an short between D3 and SYS_RESET. The symbol and the schematics which can be downloaded are corrected. But my PCB layout data still hav...
by simon
Mon Sep 17, 2012 5:58 pm
Forum: Hardware
Topic: New hardware revision?
Replies: 95
Views: 268748

Re: New hardware revision?

I would prefer the MC68000 as well. This way the design changes will be minimalistic. For the audio I am really not sure. I really like the SID sound. Maybe we could do another audio source as option. Route these signal to the input of the SID? But if we need DMA for audio, the DMA needs a good timi...
by simon
Mon Sep 17, 2012 7:35 am
Forum: Hardware
Topic: New hardware revision?
Replies: 95
Views: 268748

Re: New hardware revision?

@jonwil: A MC68000 sound interesting. We should look, what changes would be needed. For now all chips are connected to addressbus line A1 upwards, which simplifies the change from software side. Then the 16 bit buffer can be dropped. But there has to be a second Eprom for a full 16 bit databus. What...
by simon
Sun Sep 16, 2012 10:51 pm
Forum: Hardware
Topic: New hardware revision?
Replies: 95
Views: 268748

Re: New hardware revision?

Hello all and welcome, I hope the forum doesn't need approval of postings any longer. Sorry for this! For VGA there should be a scandoubler. The V9990 is capable to output a VGA signal, but it does this in two special office screen modes only. All the nice modes including the pattern modes are for s...
by simon
Sun Sep 16, 2012 9:16 pm
Forum: Programming
Topic: Pac Man like game
Replies: 3
Views: 14907

Pac Man like game

Hi,

today I worked a bit on my Pac Man like game. I added collision detection as well as player animation.
Strange that the eaten dots are not couted correct, except when moving to the right. Probably there is a bug in my collision detection. Hmmm.



Simon

cron