Thank you BigEd, that seems to make sense that you have to wait for the PLL to stabilise before using the FCLK. Currently I just did the same as WDC did in their monitor, now I will instead of doing an emty loop I will use the time between starting the FCLK and using it to zero my page 1 memory ...

Maybe I am not that precise, you are indeed correct it is an Altera part. Using it as it has 5v input and output, so no need to level shift signals.

Atmel Max 7128SLC84-15 to be precise!

Hi All, I have a W65C134SXB board and connected this to an Atmel Max700S CPLD.

Progress so far:
1) Gated the reset line and Phi2 through the CPLD to produce a delayed rise on the BE line, Thus it now boots straight into the external rom reset vectors. ( Internal rom is disabled )
2) Got FIG Forth ...

Can anyone point me in the direction in the datasheet as to what happens to the PHI2 output when RESÈT is set low.

I have a logic analyer attached and it goes to the high state, but would like to see that in the documentation.

Reason, as I know you will ask... I hope to hold BE low when Reset is ...

Need help, need to delay the BE going high by at least 200nS after the RES line goes high. This is to force the W65C134 to use the external ROM from the start. I have proved that this works with using a pushbutton to hold the BE low till after the reset.

Any suggestions would be welcome.

I have ...

Have just started putting in Garth's zero-overhead service routines, it now deals with a timer interrupt that goes off each 1 second and increments a counter.

Next is the big work of moving the UART TX/RX routines from external routines into the FORTH kernal.

I keep asking why
and get the ...

The 65c265 microcontroller is better in that it has a full 512 bytes of ram covering page 0 and 1. IO is mapped at higher addresses ($Dxxx). Maybe my next challange is to get the c265 board and get FIG working in Native mode on it. Then enjoy the fun of getting it working with 16 bit registers.
Or ...

It has from $00 to $2F for the internal registers ( IO etc ) and $40 to $FF for internal RAM. On the board the external ram is mapped to the CS6 line which is from $0100 to $7FFF. To get to the 'missing' 16 bytes ( $30 to $3F ) you would need to use the CS0 line and gate it with the CS6 line to use ...

Thanks for the welcome back, life got in the way ( in a bad way ). So picking myself up and moving forward. Nice to get back to some 6502 work. Just plqanning what to do next...

So I first encountered FORTH in 1983 at the Army Apprentice College, I already knew about BASIC so they had a teacher come in to teach me FORTH as one of the BBC Microcomputers had a FORTH ROM installed. So since then I have had a paper listing of FIG FORTH and wanted now to give it a go. So ...

I think the first step is to capture all 16 address lines, VPA, VDA, nRESEt (don't use the RDY line), both nIRQ and nNMI. The analyser is sophisticated enough to de multiplex the data bus. Still learning to use it. Only problem with it is the heat generated from it!

At present I am using the PHI2 ...

Hi,

finally back in the workshop. Got my big beast of an analyser working, it is a Biomation CLAS2000 with an embedded mac computer in the base. I have just managed to capture the data lines (and multiplexed Bank address) from my 65c816 project board. Very happy with that :D

Question is how ...

The first version of the EMMA board used a 8154 for the keyboard/display interface.

Well back in Bristol again.

I have the following EMMA manuals.

EMMA II Technical manual
'EMMA@ Hardware Manual
'MAC' Microprocessor Application Card
'EMMA' Experiment Manual
Peripheral Hardware Manual
EPROM Programmer/RAM Expansion Unit and Switched Fault Unit
Demonstration Programs for EMMA II ...