You wouldn't have "binged" too much This board is mine, the web site too.

My question until now is if this is the last and only board?

For evaluation the DCF77 signal you must detect clock lengths of 100msec, 200msec, 800msec, 900msec, 1800msec and 1900msec. The accuracy of the signal is (estimated) +/-10%.

A 6522 should do both.

Do you know that Apple offered the "Apple LocalTalk PC Card" in 1986? This ISA board is designed with a 65C02 @2MHz, SRAM, ROM, and a Z8530 SCC.

Are some of these triple-stacked, or are there more chips hiding somewhere, or did I miscount?
The mainboard of the Mac512 has 16 DRAMs (= 0.5MB). My piggyback board has 48 footprints which are 1.5MB. Altogether: 2MB. Double stacked: 4MB.

http://forum.6502.org/images/migrated/076342-000.jpg

We ...

May I add a design which I developed with a friend in the late 1980s? :-)

The Macs were very expensive at this time in West-Germany. We bought some second hand Mac 512. But we wanted to have more RAM and SCSI means we really wanted to get a full equipped Mac Plus. Megabit DRAMs were very expensive ...

So, while interfacing the 68882 to the 65xx bus is pretty simple at the hardware level, the software side is… not .

At mirrors.apple2.org.za (my first link) there is a disk image called Floating Point Engine Tools. The manual describes the interface to the hardware and the library. I would ...

It appears that an Apple II slot only provides 16 bytes of address space, [...]
There is another address space of 256bytes which is normally used for code. But you can use it also for I/O.

Additional document, Motorola's AN947 (MC68881 Floating-Point Coprocessor as a Peripheral in an 68000 System ...

I think a 1-chip interface solution - of which only half the chip is even used - is definitely simpler than the Z80 board linked earlier.

This solution interfaced to the AppleBus uses some chips more:
http://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Interface%20Cards/CPU ...

There was an addon board for the RamWorks board in the Apple IIe.

A bit more: the Apple IIe has a special slot called Auxiliary Slot which normaly was occupied by a simple 64kB RAM card. Applied Engineering developed some boards with 512kB, 1MB and more called RamWorks. This 65816 board is an ...

EF9345 can do 40*25 and 80*25 text in color.

A similiar but elder chip is the Thomson EF9364: 64*16. Eltec used this chip with their Eurocom 1. The name of this additional board is VIC-1 . A German documentation.

This is the board:


Broken external image link
http://www.ralf-kiefer.de/VME ...

I am looking for some way to add a display controller (with either composite or VGA output) to my 6502 retro computer design. My basic requirement is to do not use any modern microcontrollers or FPGAs doing the job. Only classic, retro chips.
What about an 80column card as built for the Apple II ...

Software tests can do a lot to identify the particular CPU core within the chip, but there are also hardware differences surrounding that core which can be relevant - not least the '802 vs '816 distinction.
Ok, your goal is to see the unknown cpu running safely in a socket. If you have this cpu ...

There is a small piece of code to detect the different variants of the 6502: NMOS, CMOS, Rockwell CMOS, 65802, early 6502 with bad ROR, Ricoh without decimal mode, Hudson HuC6280, Renesas 740 with/without MUL and DIV. In the case of NMOS you may be able to distinguish the different manufacturers by ...

8231 arithmetic processor for the 6502. Nice.
Any facts on the compatibility between 8231, AM9511 and AM9512 ?

i8231 is compatible to AM9511, software and hardware. We bought the Intel chips because they need less power. The AM9512 is different in software and hardware.

I will mainly use the ...