I'm looking at keeping my specification as simple ( and Cheap ) as possible. I'm assuming you're using a Z180 or Z280 to address 16Meg and have a 16 bit databus ??
My design will be as simple and hopefully easy as possible. I'm aiming to use about 10 low cost ICs. Z84C0020PEC DIP40 $2 K6T4008 or similar DIP32 $3.50 W27C512 EEPROM DIP28 <$1 EPM7128SLC84 CPLDs PLCC84 $3.50 each 2pcs V9958 Video IC DIP64 $4.50 HM62128 SRAM 128K Video RAM for V9958 SAA1099 PSG DIP18 Sound Chip MAX232 RS232 DIP16 RS232 driver Micro-controller DIP Atmel etc I should be able to get all these ICs for about $18...£14.50 or so Using so few ICs will also keep the board size down and running at 20MHz will make it about 4.5 times faster than the original SAM ! Also using CPLDs rather than discrete logic will give greater flexibility in the design. On 24 March 2013 17:45, Graeme Gregory <[email protected]> wrote: > I better start piling the pennies into my Velesoft fund! > > That sounds like the ultimate speccy! > > Graeme > > > On 24/03/13 16:50, VELESOFT wrote: > > I now work on my project SAM COUPE clone :-D > > Z80CPU 20MHz > 2MB RAM (16bit fast data bus) > 512kB FLASH EPROM > CPLD chips as ASIC replacement and next features... > SAA1099 soundchip > System bus compatible with sam coupe > ZX mode compatible with ZX128 > > VELESOFT > > ----- Original Message ----- > *From:* Leslie Anderson <[email protected]> > *To:* [email protected] > *Sent:* Sunday, March 24, 2013 3:28 PM > *Subject:* Sam Coupe project..making a real SAM in hardware ?? > > Hi. > > I'm new to the SAM COUPE group and wondered would anyone be interested in > making a homebrew SAM-COUPE ?? > > It would have an improved spec. on the original: > > Z84C0020 20MHz Z80 > 512K SRAM ( KM68400,K6T4008 etc) > 64K or so EEPROM W27C512 > CPLDs as glue logic for video, memory and I/O decoding, serial and > parallel input,output RS232, LPT1 etc > SAA1099 sound chip > V9958 +128K RAM as second VDP for sprites etc > possible using a micro-controller for PS/2 mouse / keyboard and joystick > input. > > Should cost about £30 for ICs and stuff plus another £50 for a one-of > prototype PCB. > > Anyone interested ?? > > Best Regards > > >
