Re: SBC V2 build not working

[opticpow <wa...@ingram.net.au>]

Hi All,

Thanks for the help so far. Based on David's suggestions, i've put U10 & U14 back in, re-flashed the 29F040 with N8VEM_SW.003 and had a prod around with the scope.

Just to get everyone on the same page, this is how the board is configured now, ignoring any previous posts:

• CPU clock is 8Mhz
• U2 is 29F040-90 Flash chip
• ROM image is N8VEM_SW.003
• All jumpers are default except K6 & K8 due to U2 being flash
• Currently have U18, U21, U11, U8, U9 removed
• CPU is Z84C0020PEC
  

Tests:

CPU:

1. I have both CPU Clock
2. /RESET is high, confirmed it goes low for as long as the reset switch is held down
3. /M1 pulsing @ 2MHz
4. /MREQ pulsing @ 4Mhz
5. /IORQ, /WR, /HALT, /WAIT, /INT, /NMI, /BUSAK, /BUSRQ are all high
   
6. /RD is pulsing @ 2MHz
7. /RFSH is pulsing around 2MHz

Flash

1. /CS_ROM is pulsing. the freq changes, but it is now a proper signal I believe Scope Capture
   
2. The Data lines seem to be pulsing fine Scope Capture of A0

UART

1. I have UART clock
2. I can see some of the Data lines D0-7 pulsing, some are low
3. /CS_UART seems to be high all the time from power on. I wouldn't have expected the UART to be selected the whole time.

For those still with me down this far, thanks. Any pointers as to where to from here?

Wayne.