Hello,
Can you please post the link to Hans' archives?

I did make a board with the 6545 to the schematics of Elektor.
Most TTL Glue-logic is replaced by a Gal22V8, but I've not made the content yet.
The board is 100 x 100mm and has a bus connector that fits a design by a 8085 system.
Not tested yet ...

Been there, done that.
I mean both replacing the battery by opening up the top.
And also using it instead of a "normal" ram.

They mostly are 150nS, but can be had with 120nS and even 85nS.
And if really new, the battery is switched off until the first power up.

To use them as a Ram replacement ...

Thanks for sharing this.
And I've uploaded some files I have.
Some original and some typed in from the publications.
My plans were to use the system with a 65C02 and I've made some minor changes to accomodate this.

BR/
Guus

I have used this chip in the MegaSpeedy 1050 design for the Atari 8 bit diskdrive, model 1050.
It is reprogrammed in the board, in case another drive emulation is wanted.
The software is not written by me.
Also the XC95144 is also programmed by the software designer.
But the hardware is mainly my ...

Hello,

Why not use a couple of 74LS646 to latch the I/O address when the Z80 outputs that.
Some not so complicated logic would enable to have the "normal memory" and I/O space coupled at the right moments.
A state machine in some programmable logic could do the I/O while the processor is on hold ...

Sorry, I should have been more precise.
I intended that Q1 (PHI-1) is the 180 degrees shiftet Q2 (PHI2).
So refering to the schematics that DrJefyll posted @3:58, use the /PHI2 for the latch and the PHI2 delayed as the "normal" PHI2.
In effect, the delayed PHI2 would make it look like the latch is ...

What would happen if Q1 were to be used to trigger the latch and an inverted Q1 to act as Q2?
Will this meet the timing specs?

BR/
Guus

Most likely you know.... I would suggest to test the LED's before you put them back.
Many LED's have a low reverse breakdown voltage.
An Ohm meter in the setting Diode will make the LED's light up. (faintly) Even if they're still in the circuit)

Hello BD,

Logic looks sound.
For Rom, why not use a 29F010 with 45nS access?
As far as I know, they're still available from Atmel. (And I have a couple in my stock)
The flash will also save some hassle programming Eproms. Of course the processor can reprogram the Flash. (Firmware available, written ...

Hello,
Nice to know You're back.
And I'm still interested in putting the parts I already have to work.

BR/
Guus

Hello,

Maybe this will help?
It's not mine, but I did find it somewhere.
Build it with 14 segment displays and it works quite well.

BR/
Guus

Hello,

Please see attached files.
3 examples of RTC-chips on 6502 systems.

BR/
Guus

Hello,

Check the SJA1000 for Can-Bus. (Not sure if it's still available )
For RTC, the good old MC146818.
BR/
Guus

In this particular case, I have taken a listing from a program that was written in 1982:
AS65 Assembler for R6502 [1.11]. Page 1
--------------------------------- DCFORG.ASM ---------------------------------

;from E l e k t u u r april 1982 p.4-40
;for Universele tijdsein-processor (with

And ...

Hello,

Looks like I found a bug in the assembler. (Or did I do something wrong?
This bit of code:
CLI
BRK
;
nop
nop
Compiles into:
00119 0833 58 CLI
00120 0834 00 00 BRK
00122 ;
00123 0836 EA nop
00124 0837 EA nop

And if I do:
CLI
.db $00 ; BRK
;
nop
nop
Then I get:
00119 0833 58 CLI ...