Z80 Bus Monitor Board - Designed for RC2014

Name: Z80 Bus Monitor Board - Designed for RC2014
SKU: 16196
Price: 55.90 USD
Availability: OutOfStock
Rating: 4.25 (1 reviews)

(1 Review)

It monitors the - Z80 address and data buses and displays the current values on those buses on OLED displays.

Designed by JACK in Taiwan

Z80 Bus Monitor Board - Designed for RC2014 1

Z80 Bus Monitor Board - Designed for RC2014 2

Z80 Bus Monitor Board - Designed for RC2014 3

Z80 Bus Monitor Board - Designed for RC2014 4

$55.90

Out of Stock

Sold out since Oct 24, 2020

It monitors the - Z80 address and data buses and displays the current values on those buses on OLED displays.

What is it? It monitors the - Z80 address and data buses and displays the current values on those buses on OLED displays. This allows you to, for example, see what IO ports are being read and written…

What is it?

It monitors the - Z80 address and data buses and displays the current values on those buses on OLED displays. This allows you to, for example, see what IO ports are being read and written, or what memory addresses are being written.

Why did you make it?

They chose was to add some configurable latching capability. I broke out the M1, MREQ, IOREQ, RD, and WR signals to a jumper so that those signals can be used to trigger the latch on the 74HC573. If you select M1, then in theory you should be able to see every instruction load address. If you select IOREQ then you should be able to see every IO request. Watching instruction loads at 7.3728Mhz is still not something the human eye can perceive, but io requests happen much less frequently and you can actually see stuff happen.

What makes it special?

You have to be careful not to engage two jumpers at the same time . We use a NPN BJT circuit as a NOT function. The product needs to be assembled and soldered by yourself.

BOM List:
PIC16 DIP28 x1 (micro-controller)
TTL 74HC573 DIP20 x3
OLED Module x1
LED x5
BJT BC547 x1 (NPN TO-92)
R 220 ohm x6
R 10K ohm x1
Diode 1N4114 x1
CAP 100uF x1
Jumper x1
Pin Header
PCB x1

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Review Breakdown

Average Ratings

Product: (5.00)

Documentation: (2.00)

Shipping: (5.00)

Communication: (5.00)

Karl Albert | Feb. 13, 2020

Well made Bus Monitor module

What does the module do?
It is able to show the current address and data on a little screen. In addition it has leds for M1, Mreq, RD, WR, and Iorq.
It has been tested works with systems from Steve Cousins and myself (Rotten Snow).

The kit came the parts rattling around in a little cardboard box.
The seller has genrously added extra LEDs and resistors.
The module came with no documentation.
90% of the assembly is obvious indicated by the silk screen.
I had to refer to the pictures and schematic presented on here on Tindie for final assembly.
I used about 1 hour assembling the module. I made some errrors assembling the kit, but after fixing these it worked.

Is it useful?
The LEDS are not that useful but a nice touch. I would have inverted the signals.
The little screen isvery nice and could possible be useful for troubleshooting purposes, but I have not tested this.

To conclude, it may not be useful but it makes your system looking more impressive.
Recomended.

$55.90