Thanks, everything clear now!
You really know your stuff!!!
Search found 125 matches
- Sat Jan 09, 2016 1:19 pm
- Forum: Hardware
- Topic: Questions about clock signals available on the cart slot
- Replies: 5
- Views: 9360
- Sat Jan 09, 2016 1:17 pm
- Forum: Hardware
- Topic: Question about B31 (aka #TIME) cart pin
- Replies: 14
- Views: 15158
Re: Question about B31 (aka #TIME) cart pin
I was wondering if #TIME signal behaves exactly like a #CE or has other behaviour that justifies its weird name, so I wired a cheap 8 Channel, 24 MHz logic analyzer and soldered some wires. Then made a program that continuously reads 0xA13CA. I was surprised by the result, to the point that I'm wond...
- Fri Jan 08, 2016 8:04 pm
- Forum: Hardware
- Topic: Questions about clock signals available on the cart slot
- Replies: 5
- Views: 9360
Re: Questions about clock signals available on the cart slot
Thanks for the explanation!
There's just one thing that isn't yet clear to me. The clock frequency is tied to the video mode or to the console?
A PAL console with the 60 Hz mod, can generate 7.67 MHz clock signal?
There's just one thing that isn't yet clear to me. The clock frequency is tied to the video mode or to the console?
A PAL console with the 60 Hz mod, can generate 7.67 MHz clock signal?
- Wed Dec 30, 2015 5:31 pm
- Forum: Hardware
- Topic: Questions about clock signals available on the cart slot
- Replies: 5
- Views: 9360
Questions about clock signals available on the cart slot
AFAIK, on the cartridge slot there are two clock signals available: - CLK (pin B19). - HS_CLK (pin B15). I couldn't find too much information about them. CLK is supposed to be the main 68k clock, so I suppose it's 7.67 MHz when working in NTSC mode, and 7.61 MHz when working in PAL mode. I have read...
- Fri Nov 13, 2015 8:04 am
- Forum: Hardware
- Topic: Question about B31 (aka #TIME) cart pin
- Replies: 14
- Views: 15158
Re: Question about B31 (aka #TIME) cart pin
Thanks!
I just wanted to make sure.
I just wanted to make sure.
- Thu Nov 12, 2015 2:56 pm
- Forum: Hardware
- Topic: Question about B31 (aka #TIME) cart pin
- Replies: 14
- Views: 15158
Re: Question about B31 (aka #TIME) cart pin
I have another question about mapping things using #TIME signal. Do I have to assert the #DTACK signal for data reads? IFAIK this is not needed for logic mapped under the first 32 Mib address range, but I was wondering if I'll experiment a hardware lock or any other undesired effect if reading from ...
- Thu Oct 15, 2015 6:53 am
- Forum: Hardware
- Topic: Interfacing CMOS 3.3V logic
- Replies: 15
- Views: 19990
Re: Interfacing CMOS 3.3V logic
OK, I'll go the safe route and use transceivers. Thanks for the help!
- Sat Oct 10, 2015 10:13 am
- Forum: Hardware
- Topic: Interfacing CMOS 3.3V logic
- Replies: 15
- Views: 19990
Re: Interfacing CMOS 3.3V logic
The PCB cart design from Krikkzz I linked above, is very recent (it's dated december 2014 on the PCB), and he uses resistors.
- Fri Oct 09, 2015 7:00 am
- Forum: Demos
- Topic: Garoudan - Currently WIP
- Replies: 3
- Views: 5189
Re: Garoudan - Currently WIP
Great work nevat! Good to see this version is progressing nicely!
- Fri Oct 09, 2015 6:46 am
- Forum: Hardware
- Topic: Interfacing CMOS 3.3V logic
- Replies: 15
- Views: 19990
Interfacing CMOS 3.3V logic
Has anybody info about VOH, VOL, VIH, VIL (with max and min) for the cartridge lines? Could 3.3V CMOS devices be interfaced without the need of transceivers such as 74LVC162245? Maybe adding just some series resistors to limit current on clamping diodes (if VOHmax is higher than 3.3V) would do the t...
- Wed Oct 07, 2015 3:06 pm
- Forum: Hardware
- Topic: Question about B31 (aka #TIME) cart pin
- Replies: 14
- Views: 15158
Re: Question about B31 (aka #TIME) cart pin
Thanks for the replies!
Just to complete the topic, is there detailed information about the timing of this signal? Is it asserted the same time as e.g. #C_CE?
Just to complete the topic, is there detailed information about the timing of this signal? Is it asserted the same time as e.g. #C_CE?
- Sun Oct 04, 2015 5:55 pm
- Forum: Hardware
- Topic: Question about B31 (aka #TIME) cart pin
- Replies: 14
- Views: 15158
Question about B31 (aka #TIME) cart pin
I have read here that B31 (#TIME) line is active (low) on accesses to 0xA13000 -> 0xA130FF range. Is this true? Could I wire this #TIME line to a battery backed 256 byte SRAM chip #CE signal, and use it to save/load games without conflicting with the ROM chips? (of course also A1~A8, D0~D7 and #LDSW...
- Wed Jun 03, 2015 1:07 pm
- Forum: Hardware
- Topic: Cartridge interrupts?
- Replies: 4
- Views: 9069
- Wed Jun 03, 2015 9:22 am
- Forum: Hardware
- Topic: Cartridge interrupts?
- Replies: 4
- Views: 9069
Not even Z80 ones? If the answer is a big NO, is there a way to automatically trigger DMA transfers when a cart pin changes? (I suppose I'll get another NO here). I want to connect a 16C550 UART to the bus, and if I can neither use interrupts nor automatic DMA, bit rate will be greatly limited (beca...
- Tue Jun 02, 2015 8:20 pm
- Forum: Hardware
- Topic: Hmmmm.......?
- Replies: 25
- Views: 40798