CP/M Ready Z80 SBC, Overclocking Experimental Testbed For ZRCC, 6
Item History & Price
| Reference Number: Avaluer:51466063 |
This is an experimental ZRCC rev1.3 boards on auction starting from $1.
The rev1.3 of ZRCC is electrically identical to rev1.1 ZRCC currently being auctioned. The purpose of rev1.3 is to explore the upper design limit of ZRCC. It uses a fast 25nS 128KX8 RAM, fast disk-on-module, and Z80 in PLCC package. The resulting board runs reliably with most CMOS Z80 at 29.5MHz CPU clock, about 50% faster than the fastest production 20MHz Z80. Below is the majo...r features of ZRCC rev1.3
* Z80 running at 29.5MHz
* 128K RAM in four 32K banks
* EPM7064S CPLD
* Disk-on-module drive
* CP/M-ready, CP/M 2.2 and CP/M 3
* 26-pin I/O expansion (RC2014-lite)
* 76mm x 50mm 2-layer pc board
The entire design information is published at https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:zrcc:zrcc1_3
Here are the steps to confirm the board can reliably operate at 29.5MHz and passed the following tests:
* Run memory diagnostic while sweeping supply voltage from 4.75V to 5.25V,
* Initialize a new DOM disk, upload and install CP/M software,
* Boot into CP/M and do full disk copy with verify from disk A to disk D
* Perform megabyte-size file transfer using XMODEM
* Perform the comprehensive instruction test, zexall.com
* Run ASCII mandelbrot benchmark
* Compile and run a "Hello World" C program using Hitech C v3.09
* Boot into SCMonitor and play a game of Startrek.
I am well aware that 29.5MHz operation is far beyond Zilog's specification so I am offering this experimental product with 60 day no-question-asked return policy.
The overall dimension of the board (including the USB adapter) is 2 x 5.5 inches. It draws about 150mA at 5V, typical. This item is fully assembled and tested with CP/M 2.2 and CP/M 3 software installed in the 32 meg DOM drive. It is ready to run with external 5V power through the 2.1mm X 5.5 mm power jack and USB connected to the included USB-to-serial adapter. Set the terminal emulation to 115200 N-8-1, no hardware handshake.
You will receive the item in the first 2 photos of this auction including the disk-on-module drive and the USB-to-serial adapter.
The rev1.3 of ZRCC is electrically identical to rev1.1 ZRCC currently being auctioned. The purpose of rev1.3 is to explore the upper design limit of ZRCC. It uses a fast 25nS 128KX8 RAM, fast disk-on-module, and Z80 in PLCC package. The resulting board runs reliably with most CMOS Z80 at 29.5MHz CPU clock, about 50% faster than the fastest production 20MHz Z80. Below is the majo...r features of ZRCC rev1.3
* Z80 running at 29.5MHz
* 128K RAM in four 32K banks
* EPM7064S CPLD
* Disk-on-module drive
* CP/M-ready, CP/M 2.2 and CP/M 3
* 26-pin I/O expansion (RC2014-lite)
* 76mm x 50mm 2-layer pc board
The entire design information is published at https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:zrcc:zrcc1_3
Here are the steps to confirm the board can reliably operate at 29.5MHz and passed the following tests:
* Run memory diagnostic while sweeping supply voltage from 4.75V to 5.25V,
* Initialize a new DOM disk, upload and install CP/M software,
* Boot into CP/M and do full disk copy with verify from disk A to disk D
* Perform megabyte-size file transfer using XMODEM
* Perform the comprehensive instruction test, zexall.com
* Run ASCII mandelbrot benchmark
* Compile and run a "Hello World" C program using Hitech C v3.09
* Boot into SCMonitor and play a game of Startrek.
I am well aware that 29.5MHz operation is far beyond Zilog's specification so I am offering this experimental product with 60 day no-question-asked return policy.
The overall dimension of the board (including the USB adapter) is 2 x 5.5 inches. It draws about 150mA at 5V, typical. This item is fully assembled and tested with CP/M 2.2 and CP/M 3 software installed in the 32 meg DOM drive. It is ready to run with external 5V power through the 2.1mm X 5.5 mm power jack and USB connected to the included USB-to-serial adapter. Set the terminal emulation to 115200 N-8-1, no hardware handshake.
You will receive the item in the first 2 photos of this auction including the disk-on-module drive and the USB-to-serial adapter.
