[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [N8VEM-S100:4872] 2 different "Z80 CPU BOARD VERSION 02" pcbs out there

Andrew L took names for a V2 Z80 run and those shipped out to people in February (I have one).

Gary took names and did a run in March, I recall John M mentioned some small tweaks after the initial V2 boards came out, but everything on the S100Computers site has said "V2".  I guess I would have expected one of them to be "V2a"

It would be really good if we had a description of the "why" behind these changes somewhere accessible so if I go build my "original" V2 later I can understand what is going on..... 

Andrew B

On Saturday, August 9, 2014 11:14:50 AM UTC-7, Gary Kaufman wrote:
Ed -

The batch I had made up had the JP10 and K3 jumpers.  The jumper block diagram on John's site is the "earlier" version 02 board.    JP10 (not pictured) is above the LS04 just to the right of the top of the voltage regulator.  K3 is to the right of JP8.

My jumper setting notes:

(The * settings are the ones I used)

I can email you a picture of the completed board if it would help.

- Gary

JP1    GND to OV_A (S100 pin 20) (normally open)
JP2    GND to OV_B (S100 pin 53) (normally open)
JP3    GND to OV_C (S100 pin 70) (normally open)

JP4  *Reset to POC
JP5    Reset from power
JP6  *Reset to slave_clr
JP7 * Reset from push button

JP8    EPROM/EEPROM Pin 23 / A11
    1-2    A11    *1-2 for 28C64 or 27C64
    2-3    VCC   
    1-2    VCC    *open for 28C64 or 27C64

JP10    Onboard Rom
        *Jumpered  Enabled
        Open       Disabled

K1      1-2    PWRFAIL to NMI        If NMI software is not implemented do not connect
     2-3    NMI to NMI       

K2     1-2     older pre-IEEE696 boards
    *2-3     clock disable of control lines

K3    CPU Clock Source
    *1-2     Oscillator
     2-3    external CPU Clock (NDEF3)

P2    Memory window configuration port
    0xH to FxH
        A4     1-2
        A5     3-4
        A6    *5-6        Output Ports D2H, D3H
        A7     7-8

P3    PROM Boot Address
    *no jumpers    F000H

P4    1-2    S-100 2Mhz clock signal to bus when z80 active
    3-4    S-100 MWRT to bus when z80 active

P8/P9/P10    Monitor Jump Location
    P8      P9      P10
1    U15      GND      A15
2    U15     GND      A14
3    U15      GND      A15
    *F000H    P8 1,2,3,4 to P10 1,2,3,4

P36     Allows wait states
     1-2  Every sINTA
    *3-4  M1 memory bus cycles
     5-6  All memory cycles
P37    *1-2  Partial latch mode
     3-4  Full latch mode

P39  A12 Address Line to U13 (EPROM/EEPROM)

     1-2  Tie to VCC
     3-4  Tie to GND
     5-6  Tie to A12 
    *7-8  Control by bit1 of port D3H

    Output 00H to port D3H to select lower 4K of ROM
    Output 01H to port D3H to totally remove ROM from the Z80's address space
    Output 02H to port D3H to select upper 4K of ROM

SW2    ME Wait states for P36 option
    * switch 8 closed (right most) for 1 wait state, rest open

SW3    I/O Wait states
    * switch 7,8 closed (right most 2) for 2 wait state, rest open

SW4    ROM Wait states for onboard EEPROM
    * switch 8 closed (right most) for 1 wait state, rest open

On 8/9/2014 1:54 PM, Edward Snider wrote:
Hello all,

I am in the process of trying to get my Z80 cpu card running, and I've noticed that 
there are definitely 2 different pcbs marked "Z80 CPU BOARD VERSION 02",
I have them both in front of me.

The one I built does not have a JP10 or K3 jumpers.  Is this actually a V1 board then?
I'm trying to figure out which schematics I should be looking at.

Anyone know of any other differences, jumper settings, issues, etc, I should be aware of
with this board?  So far I'm just trying to get the cpu into halt with an eprom full of 76's
and not having any luck.  Probably don't understand the jumper settings well enough.


You received this message because you are subscribed to the Google Groups "N8VEM-S100" group.
To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.