[[boards:sbc:z180_mark_iv:z180_mark_iv]]
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boards:sbc:z180_mark_iv:z180_mark_iv [2025/12/16 03:29] – Revision from 2025-12-16 boards:sbc:z180_mark_iv:z180_mark_iv [2026/06/15 12:38] (current) – external edit 127.0.0.1
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 +/* Imported from Wayback Machine
 +   Original URL : https://www.retrobrewcomputers.org/doku.php?id=boards%3Asbc%3Az180_mark_iv%3Az180_mark_iv
 +   Snapshot date: 2026-04-06
 +   Generator    : wayback-archiver
 +*/
 +
 +====== Z180 Mark IV ======
 +
 +===== Introduction =====
 +
 +The Z180 Mark IV is a single board computer, meaning it may run stand-alone. It also has an interface to the RetroBrew bus (ECB) for access to additional peripheral boards.
 +
 +{{[[lib:plugins:ckgedit:fckeditor:userfiles:image:boards:sbc:z180_mark_iv:markivr2.jpg]]
 +
 +Gallery
 +
 +===== Specifications =====
 +
 +A Z180 cpu up to 33Mhz. Using an 18.432Mhz oscillator, the newest Z180 processors are easily overclocked 2X to 36.864Mhz.
 +
 +512k of static RAM memory. Up to 1Mb of EPROM, or up to 512k FLASH memory.
 +
 +Date/time clock with battery backed NVRAM (DS1302). Backup power is usually provided by a 0.22F super-capacitor.
 +
 +Terminal connection through an RS-232 port using an IBM-PC serial port 10-pin header.
 +
 +Twisted pair FDX communication through an RJ-12 (6P4C) modular jack.
 +
 +A Secure Digital (SD) card slot. Standard, HC, and XC cards are supported by ROM firmware.
 +
 +A 40-pin IDE connector which supports 8-bit transfers, and is usually used with a Compact Flash card Master/Slave adapter.
 +
 +Power is supplied to the Mark IV SBC through the ECB bus, or through a 4-pin Molex connector (PC/AT disk drive power connection). The board operates using +5V power only.
 +
 +Board Archive pages [[n8vem-pbwiki-archive:0:35845334:48860639:70934427:index|here]].
 +
 +===== Board =====
 +
 +Schematic: [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=boards:sbc:z180_mark_iv:markiv-sch-2.0-008-rev.pdf|:boards:sbc:z180_mark_iv:markiv-sch-2.0-008-rev.pdf]]
 +
 +PCB Layout: [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=boards:sbc:z180_mark_iv:markiv-brd-2.0-008.pdf|:boards:sbc:z180_mark_iv:markiv-brd-2.0-008.pdf]]
 +
 +Parts List: [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=boards:sbc:z180_mark_iv:mark_iv-parts_list-2.0-008-rev.txt|:boards:sbc:z180_mark_iv:mark_iv-parts_list-2.0-008-rev.txt]]
 +
 +Gerber (MFG):[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=boards:sbc:z180_mark_iv:markiv-2.0-008a-mfg.zip|:boards:sbc:z180_mark_iv:markiv-2.0-008a-mfg.zip]]
 +
 +OBSOLETE: Gerber [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=boards:sbc:z180_mark_iv:markiv-2.0-008-mfg.zip|:boards:sbc:z180_mark_iv:markiv-2.0-008-mfg.zip]] (out of date Silkscreen layer)
 +
 +The circuit layers of the two Gerber ZIPs are identical. The “008a” Gerbers correct information on the Silkscreen layer)
 +
 +Note: For board manufacture at JLPCB rename the PCB_Edges, Inner2, Inner3 file from .gbr to .gm1, .gp1 and .gp2 respectively.
 +
 +====== Construction ======
 +
 +Install SD card socket before installing RR2 so solder pads are more accessible.
 +
 +Note C40 is installed inside of the socket. Ensure socket has appropriate clearance or install C40 on rear of board.
 +
 +===== Jumper Configuration =====
 +
 +RESET CONFIGURATION
 +
 +P1 1-2 N8VEM (LEGACY)
 +
 +P1 2-3 KONTRON
 +
 +IDE POWER
 +
 +P9 CLOSED = VCC TO IDE
 +
 +P9 OPEN = GND TO IDE
 +
 +ON BOARD PERIPHERALS ADDRESS
 +
 +P10 80H = OXXX where O = open and X is closed
 +
 +EPROM (27C080)
 +
 +P11 1-2
 +
 +P12 1-2
 +
 +FLASH (29F040/39SF040)
 +
 +P11 2-3
 +
 +P12 2-3
 +
 +===== Connectors =====
 +
 +EXTERNAL RESET
 +
 +P2
 +
 +PRIMARY SERIAL PORT CONNECTION
 +
 +P3
 +
 +With a MAX233 installed at U4 the serial port provides RS-232 level signals on Tx, Rx, CTS and RTS lines. Connection to the P3 header is via a standard Serial RS232 DB9 Male COM Port IDC connector. The Z8S180 enforces CTS/RTS flow control so this must be selected in your terminal program and supported by your serial cable and interface.
 +
 +If a MAX233 is not being used and communication is TTL level, the following connections should be made on the U4:
 +
 +2-5 - Tx
 +
 +3-4 - Rx
 +
 +1-18 - RTS
 +
 +19-20 - CTS
 +
 +Recommended RS-232-TTL to USB converters are the CP2102 based devices that have the additional RTS/CTS pin header locations.
 +
 +In the absence of a device or cable that support CTS/RTS, pin 1 and pin 20 should be bridges on U4.
 +
 +RS422 SERIAL PORT CONNECTION
 +
 +P15
 +
 +The RS422 provides the advantage of higher speed, greater noise immunity and multi-drop connectivity over the primary serial connector and is ideal for connecting to remote controllers. Only Tx/Rx is supported i.e there are no flow control or modem signals.
 +
 +===== Firmware =====
 +
 +The UNA BIOS was developed on the Mark IV, and was updated to version 2.1 in January 2017. The distributed images contain Will Sowerbutt's port of CP/M 2.2.
 +
 +See: software[[software:firmwareos:una:binaries:start|/]] firmwareos / una / [[software:firmwareos:una:binaries:start|binaries]] for the binary (.tgz and .zip) and source files.
 +
 +Wayne's RomWBW is also distributed for this board.
 +
 +See: software[[software:firmwareos:una:binaries:start|/]] software:firmwareos / romwbw for details.
 +
 +=== Test ROM TEST0.BIN ===
 +
 +This [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=boards:sbc:z180_mark_iv:test0.zip|ROM]] provides a suite of tests to confirm the operation of the Mark IV board.
 +
 +Requirements:
 +
 +SD Card installed with D3 LED
 +
 +Bicolor status LED
 +
 +18.432Mhz clock
 +
 +Serial connection at 9600 with CTS/RTS flow control.
 +
 +Tests:
 +
 +Check correct installation of address jumpers.
 +
 +Determine the processor version.
 +
 +Check the serial interface signal CTS.
 +
 +Terminal output verification.
 +
 +Keyboard echo test.
 +
 +DS1302 & NVRAM test.
 +
 +Check SDCard switch statuses.
 +
 +Initial operational status is visually identified by test 1-3 flashing D3 in a sequence of 5-flashes, then 3-flashes, then 1 flash.
 +
 +See the 0README.TXT file for more detailed information.
 +
 +====== Benchmark ======
 +
 +asciiart.bas benchmark for Mark IV 18.348Mhz Z180 board running Microsoft MBASIC v5.21:
 +
 +0m58s
 +
 +<code code>
 +10 FOR Y=-12 TO 12
 +20 FOR X=-39 TO 39
 +30 CA=X*.0458
 +40 CB= Y*.08333
 +50 A=CA
 +60 B=CB
 +70 FOR I=0 TO 15
 +80 T=A*A-B*B+CA
 +90 B=2*A*B+CB
 +100 A=T
 +110 IF (A*A+B*B)>4 THEN GOTO 200
 +120 NEXT I
 +130 PRINT " ";
 +140 GOTO 210
 +200 IF I>9 THEN I=I+7
 +205 PRINT CHR$(48+I);
 +210 NEXT X
 +220 PRINT
 +230 NEXT Y
 +
 +000000011111111111111111122222233347E7AB322222111100000000000000000000000000000
 +000001111111111111111122222222333557BF75433222211111000000000000000000000000000
 +000111111111111111112222222233445C      643332222111110000000000000000000000000
 +011111111111111111222222233444556C      654433332211111100000000000000000000000
 +11111111111111112222233346 D978 BCF    DF9 6556F4221111110000000000000000000000
 +111111111111122223333334469                 D   6322111111000000000000000000000
 +1111111111222333333334457DB                    85332111111100000000000000000000
 +11111122234B744444455556A                      96532211111110000000000000000000
 +122222233347BAA7AB776679                         A32211111110000000000000000000
 +2222233334567        9A                         A532221111111000000000000000000
 +222333346679                                    9432221111111000000000000000000
 +234445568  F                                   B5432221111111000000000000000000
 +                                              864332221111111000000000000000000
 +234445568  F                                   B5432221111111000000000000000000
 +222333346679                                    9432221111111000000000000000000
 +2222233334567        9A                         A532221111111000000000000000000
 +122222233347BAA7AB776679                         A32211111110000000000000000000
 +11111122234B744444455556A                      96532211111110000000000000000000
 +1111111111222333333334457DB                    85332111111100000000000000000000
 +111111111111122223333334469                 D   6322111111000000000000000000000
 +11111111111111112222233346 D978 BCF    DF9 6556F4221111110000000000000000000000
 +011111111111111111222222233444556C      654433332211111100000000000000000000000
 +000111111111111111112222222233445C      643332222111110000000000000000000000000
 +000001111111111111111122222222333557BF75433222211111000000000000000000000000000
 +000000011111111111111111122222233347E7AB322222111100000000000000000000000000000
 +</code>
  
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