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This is a temporary page in this section. The aim is to have a new section. Project will be a central point where users can read what projects Z88 users have done. It will be both technical but user friendly.
Z88 Motherboard
Here is where all the parts are on the motherboard.
Flash EPROM
Rakewell will be selling their 1M / 512K Bare PCB (un-populated) if there is sufficient demand. This allows the following cards to be built. 1M RAM, or 1M FLASH, or 512K FLASH, or 512K RAM or 512K RAM/FLASH card. If you are interested in this, please contact Rakewell directly. |
1M RAM
The memory chip described in the article below is no longer available. A suitable replacement are listed. Rakewell will be selling their Flash/RAM PCB. This may be used instead of modifying the original 32K PCB board. This would upgrade the card to 1M. Amplia un cartucho de Z88 hasta 512Kbytes - Convert 32K RAM card to 512K RAM | |
| | CYPRESS SEMICONDUCTOR - CY62158ELL-45ZSXI - SRAM, 8MBIT, PARALLEL, 45NS, 44TSOP Note: This chip will be tested, results will follow. |
ALLIANCE MEMORY - AS6C8008-55ZIN - SRAM, 8MB, 2.7-5.5V, 1024KX8, TSOP44 Note: This chip will be tested, results will follow. | |
This memory chip is a 'drop-in' replacement for the BSI chip (see below). It currently fails in PipeDream OZ 4.2. More testing is required. LYONTEK - LY62W10248ML-55LLI - SRAM, 8M, 1MX8, 2.7-5.5V, 44TSOPII | |
This memory chip has been used in the Rakewell's Flash/RAM card successfully. This part is no longer manufactured. BSI (BRILLIANCE SEMICONDUCTOR) - BS62LV8001EIP55 - IC, SRAM 8M, 1024KX8, 2.4-5.5V, SMD |
Technical Spec of a Flash and RAM chips
| Z80 4MHz | AS6C8008 | ||||||
|---|---|---|---|---|---|---|---|
Supply Voltage Min | V | 2.4 | 2.7 | 2.7 | 4.5 | ||
| Supply Voltage Typ | V | - | 3.0 | 3.0 | 5.0 | ||
| Supply Voltage Max | V | 5.5 | 5.5 | 5.5 | 5.5 | ||
Input High Voltage | V | 2.2 to VCC | 0.7 x VCC min to VCC+0.3 | 2.2 to VCC+0.3 | 2.4 to VCC+0.3 | 2.4 to VCC+0.5 | 2.2 to VCC + 0.5 V |
Input Low Voltage | V | -0.3 to 0.8 | 0.5 to 0.8 | -0.5 to 0.8 | - 0.2 to 0.6 | - 0.2 to 0.6 | –0.5 to 0.8 |
Output High Voltage | V | 2.4 min | 0.85 x VCC | 2.4 min | 2.4 min | 2.4 min | |
Output Low Voltage | V | 0.4 max | 0.45 | 0.4 max | 0.4 max | 0.4 max | |
Standby Power | uA | 1 | 3.5 to 50 | 6 to 80 | 10 to 50 | 2 to 8 | |
| Power Consumption | mA | 20 - 40 | 39 | 60 | 30 to 60 | 1.8 to 3 | |
VCC for Data Retention | V | 1.5 | 2.0 | 1.5 | 2.0 | ||
| Read Timings | |||||||
| Read Cycle Time tRC | ns | 55 min | 55 min | 55 min | 55 min | 45 min | |
| Address Access Time tAA | 55 min | 55 max | 55 max | 55 max | 45 max | ||
Chip Enable Access Time tACE | 55 min | 55 max | 55 max | 55 max | 45 max | ||
| Output Enable Access Time tOE | 30 max | 25 max | 30 max | 30 max | 22 max | ||
| Chip Enable to Output in Low-Z tCLZ | 18 min | 10 min | 10 min | 10 min | 5 min | ||
| Output Enable to Output in Low-Z tOLZ | 18 min | 10 min | 5 min | 5 min | 10 min | ||
| Chip Disable to Output in High-Z tCHZ | 30 max | 20 max | 20 max | 18 max | |||
Output Disable to Output in High-Z tOHZ | 25 max | 20 max | 20 max | 18 max | |||
Output Hold from Address Change tOH | 0 | 10 min | 10 min | 10 min | 10 min | ||
| Write Timings | |||||||
Write Cycle Time tWC | 55 min | 55 min | 55 min | 55 min | 45 min | ||
Address Valid to End of Write tAW | 40 min | 40 min | 50 min | 50 min | 35 min | ||
Chip Enable to End of Write tCW | 0 | 50 min | 50 min | 35 min | |||
Address Set-up Time tAS | 0 | 40 min | 0 | 0 | 35 min | ||
Write Pulse Width tWP | 20 min | 30 min | 45 min | 45 min | 35 min | ||
Write Recovery Time tWR | 0 | 0 | 0 | 0 | |||
Data to Write Time Overlap tDW | 25 min | 25 min | 25 min | 25 min | 25 min | ||
Data Hold from End of Write Time tDH | 0 | 0 | 0 | 0 | 0 | ||
Data Setup to Write End | 25 min | ||||||
Output Active from End of Write tOW | 5 min | 5 min | 5 min | ||||
Write to Output in High-Z tWHZ | 25 max | 20 max | 20 max | 10 max | |||
| THE Z80 CPU : TIMING |
512K RAM
The memory chip described in the article below is no longer available. A suitable replacement may be ALLIANCE MEMORY - AS6C4008-55SIN - SRAM, 4MB, 2.7V-5.5V, 512KX8, SOP32 Note: This has not been tested. Rakewell will be selling their Flash/RAM PCB. This may be used instead of modifying the original 32K PCB board. This would upgrade the card to 1M. Amplia un cartucho de Z88 hasta 512Kbytes - Convert 32K RAM card to 512K RAM |
Internal RAM
The memory chip described in the article below is no longer available. A suitable replacement may be ALLIANCE MEMORY - AS6C4008-55PCN - SRAM, 4MB, 2.7V-5.5V, 512KX8, PDIP32 This has not been tested yet | |
The memory chip described in this article below is no longer available. A suitable replacement may be ALLIANCE MEMORY - AS6C4008-55SIN - SRAM, 4MB, 2.7V-5.5V, 512KX8, SOP32 This has not been tested yet | |
The memory chip described in the article below is no longer available. A suitable replacement may be ALLIANCE MEMORY - AS6C1008-55PCN - SRAM, 1MB, 2.7V-5.5V, 128KX8, PDIP32 This has not been tested yet |
Internal ROM
The EPROM chip described in the article below is no longer available. A suitable FLASH chip replacement is |
Bluetooth
PC Link
This section is being written. Have you got any projects you would like to share with the community? |
Introduction
Ever since the Z88 came out, technical users began to improve it by writing additional software and producing hardware. Z88 Applications & Projects is a central point where past Companies. developers and end users can share past information.
The commercial value of software written for the Z88 is now past. The author's hope is that this may become a central portal where the history of all the Z88 Applications written, may be recorded and stored. A lot of hard work has been done and I wish to invite past developers to share this publicly by uploading their source code, the application image, manuals, publicity and photos of the finished product. These may be just sitting somewhere on a disc or a computer, sitting on a bookshelf or in the attic, its value unknown to the uninitiated and will therefore be eventually lost.
Rakewell's website is being revamped. Copies of documentation and applications will be downloaded here. I will try and contact the different companies who produced the products to ask for their permission, but this may not always possible because Companies cease trading and personal addresses change. If you are the author or have produced any of the these products and wish them to be removed, please contact me and this will be done.
Vic Gerhardi 10th August 2013
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