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Quick update

I just received the alpha boards. They were ordered from iTead this time. They came in ahead of schedule so I have to get busy and order the parts now ūüėÄ

Plans going forward. I will be hand building the first two cards. The rest of these alpha boards will be baked using the oven my brother and I built last year.

I will be taking the feedback from the testers and rolling that into a revised design. The PCB studio will then do a small assembly run for me based on that design.

Once those are received and tested then a large run will be started.

 

Working on Uthernet II

Hi All … has been a long time now between posts or updates but in the back ground Oliver Schmidt and I have been working on a second generation Uthernet card. This card will not be backward compatible with the current Uthernet from a software standpoint but will perform the same function. The plan is to use the Wiznet W5100 chip in indirect access mode. Oliver has already coded a Contiki driver, IP65 already contains support for the W5100 chip courtesy of Jonno Downes, both David Schmidt and Ewen Wannop have indicated they would be willing to update ADTPro and Marinetti respectively to support this new card.

After 10 years it seems like I have come back full circle to the Wiznet chip as my very first Ethernet card was based on a w5100 predecessor.

The ball is rolling to produce some alpha/beta boards which I hope will be ready in a months time. A few of these cards will be available to folks who aren’t shy about testing new hardware.

UthernetII

 

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I’m still here

Doing another run of Uthernet cards. Also working on a project in the background revolving around another attempt at getting WiFi running on an Apple II.

RAM

Disclaimer: I am trying to be technically accurate but please send any comments or corrections and I will update this blog post.
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This blog entry is going to be about RAM. There are 5 main types I am going to cover and discuss their applicability to some of the projects I am working on.

We have two families of RAM –¬† Dynamic RAM (DRAM and SDRAM) and¬† Static RAM (SRAM, NVRAM, PSRAM).

When the Apple II was in it’s heyday, DRAM was popular because it was cheaper then most other types of memory. There were a few memory cards made with SRAM later in the cycle but the predominant memory used inside the Apple and on expansion cards was DRAM. It came in various bit configurations 1x64Kbits, 1x256Kbits 1x1024Kbits, 4x64Kbits etc ‚Ķ eventually chips were mounted on a simm vs being socketed or directly soldered.¬† One of the side effects of DRAM’s are they have to be constantly refreshed and that was accomplished on the Apple II during the video display cycle (read Jim Sathers – Understanding the Apple II or Iie for the best technical description of how this works). DRAM also worked with a multiplexed address bus where usually the row addresses was applied followed by the column address to get the final bit location in a chip

When SyncronousDRAM (SDRAM) started appearing, the simm/dimm¬† started having BGA (ball grid array) chips mounted on the simm’s vs DIP or other SMT form factors. While SDRAM’s are more complicated to design in a system because they require a synchronized clock signal and they need to be initialized before they can be used after power up, they also have the benefit of having much higher bit densities then previous DRAM’s. Single chips can have 64, 128 and 256M bits and being¬† DRAM they still need to be refreshed although some SDRAM have auto refresh circuitry built in.

SRAM started to be come more prevalent in the late? 80’s. The Applied Engineering Pocket Rocket was one example of a static ram based RAM card. Static rams come in various bit densities today, you can get 4, 8 and even 16Mbit single chips. These are nowhere near the densities of SDRAM and quite a bit more expensive. Some additional benefits of SRAM are that you can find high speed SRAMS typically used for cache or you can find low power srams used in embedded systems. In fact most microcontrollers today come with some amount of internal SRAM. SRAM can be battery backed in order to retain it’s bits or you could employ a specific type of SRAM called NVRAM which¬† is in most cases a SRAM with a battery in a single package. Cypress does make an actual NVSRAM chip that uses something called QuantumTrap cell vs a battery but these along with NVRAM are expen$ive.

PSRAM‘s (Pseudo Static Ram) are kind if like the best of both worlds. It is typically SDRAM memory packaged with a SRAM like interface (non multiplexed address lines) and auto refresh circuitry. You get the benefit of simple SRAM interface, higher bit densities (128Mbits) and typically lower power consumption. These chips were designed for cell phones (it’s called Cellular RAM by some companies) and only comes in VFBGA (very fine BGA) packages which make it hard to use in prototypes or small runs. It is more expensive then SDRAM but significantly cheaper when compared to regular SRAM in terms of actual chip cost and PCB board space.

Projects that need RAM

My IIcmxp project for the IIc started out as a mass storage solution for the memory expandable Iic and above but it quickly became apparent to me that folks might not want to toss out a perfectly good 1MB ram card in order to replace it with a mass storage solution. So I started working on a 1MB SRAM add-on for the IIcxmp. If you want more details about that project (and where it stalled)  read some of my older blog posts.

While I have implemented SRAM, I have also been wanting to see if some of these other types of RAM could be applied to this and other projects.

So as a sub/side project I am working on a 16MB slinky project.  Why slinky vs AUX style memory you say … well I would like my research to be applicable to that style or Iigs Ram cards as well but Slinky is the simplest to implement as a test fixture, using different memory modules. Once these various modules are tested and understood then work on using them can begin to be applied to these other designs. Possible uses could be Ram expansion for existing Ramworks and Ramfactor cards or complete replacements for  Iigs memory cards, Ramworks, Ramfactor, Slinky etc,

Slinky Base card (test fixture)

SlinkyMemBase Front

SlinkyMemBase Back

The base card consists of a XC95144XL CPLD, 74LVCC4245 transceiver and a 8KB EEPROM. The CPLD and 245 are 3.3v devices but are 5v tolerant. I am still waffling on using a 5v vs a 3.3v EEPROM (I was hoping to use my wilem EPROM programmer vs doing it in system but we’ll see).

Memory Modules

I plan on testing 4 memory modules.

Basic SDRAM: First one is a 32MB SDRAM memory module originally developed for Parallax Propeller based systems. You can find a link here. I ordered this module a few weeks ago. Still waiting for it to arrive.  I expect the CPLD to be setup to do the initial configuration and linear to R/C address conversion.

XAVR Coprocessor: Second one is the nice module I mentioned earlier which can be the basis for any number of projects. This time around it will mainly be used to serve up RAM from the SDRAM module. Might possibly be considered a prototyping option for the Iicmxp as well.

XRAM: The 3rd option is a multichip smorgasbord of Cypress RAM totaling 4MB. This module will let me test various SRAM  modules a) CY14B104L NVSRAM Р512K (will use 2 for a total of 1MB), b) CY62158EV30LL РSRAM 1MB and c) CY62167DV30LL РSRAM 2MB

EZFlash 3n1: I plan to investigate the possibility of repurposing of this module to access the 16MB of PSRAM and possibly the 512K of battery backed SRAM. If this module was used on a Iigs memory card it’s possible? it could be configured to provide 8MB RAM and 8MB of ROM(Flash).

The basic SDRAM module is already pre-built but the others I am going to have to bring to life on some prototyping board.

New hardware starts to roll in … Part 3

1) Receive a few more breakout boards kits  for TSOP I and II devices.

  1. http://www.proto-advantage.com/store/product_info.php?products_id=2210239
  2. http://www.proto-advantage.com/store/product_info.php?products_id=2210247

2) Received my Sparkfun order which consisted of a
Heat gun

  1. http://www.sparkfun.com/products/10326

Two bluetooth modules for a non apple II related Lego NXT project

  1. http://www.sparkfun.com/products/9913
  2. http://www.sparkfun.com/products/9977

SPI based clock calendar chip to develop a SPI module for my 4 Port SPI card – AppleSPI.

  1. http://www.sparkfun.com/products/10160

New hardware starts to roll in … Part 2

As part of my memory investigation I purchased these two products (there is a SDCard adapter beside them for comparison purposes)

EZFlash Devices

EZFlash Vi ($9.99) (Link) – 4Mbit of Flash and a MicroSD card socket

  1. Link Front Side – Pic
  2. Link Back Side – Pic

Chip descriptions

  1. M6MGT321s4TP – Flash + SRAM ( 512K+512K?)
  2. XILINX Spartan XCS50A – VQG100AGQ1041
  3. MicroSD slot

EZ Flash 3n1 ($22) (Link) – (32MB Flash/512K SRAM, 16MB PSRAM and rumble device

  1. Link Front Side Pic
  2. Link Back Side Pic

(Sorry the pics are a little blurry. Also notice the cartridge fingers are already corroded and need to be cleaned up a little).

To mount this cart on a test PCB i’ll be looking to pick up one of these

Chip descriptions

  1. Altera MAX II EPM240T100I5N
  2. Fujitsu – 84VZ046G-60 (32MB Flash + 512K SRAM – Battery backed)
  3. Fujitsu – 84VZ128D-70 (16MB PSRAM)

New hardware starts to roll in … Part 1

I have been on a bit of a spending spree lately … I thought I would share what I have been buying as it comes in and then work it into my development plans.

My first items were some prototyping supplies from a place called – Proto Advantage

http://www.proto-advantage.com

They have a good selection of stuff and prices are pretty reasonable

Products

——————————————————

Vacuum Pen (TLVACPEN)
Premium Jumper Wires 6″ M/M Pack of 10 (WRMM10)
Premium Jumper Wires 6″ F/F Pack of 10 (WRFF10)
Magnifier 10x – Illuminated With High Power White LEDs (TLMAG01)
Deluxe Test Lead Set (TL-22)
Banana to Minigrabber Set (TL-12)
Solder Paste 0.5cc 63/37 Sn/Pb No Clean (SLD005CC-NC-PB)
Solder Paste Dispensing Needle Kit – 11 piece (DISPNDLEKIT1)
ESD Electronics Tweezers (TWESD-15)
TSOP-54 (II) (0.8 mm pitch, 10.16 mm body) PCB and Stencil Kit (PA0210-KIT)
PQFP-208 (0.5 mm pitch, 28 x 28 mm body) PCB and Stencil Kit (PA0202-KIT)

So you can probably tell from some of those items that I want to start experimenting with doing my own surface mount components for prototyping.

The second batch of items to arrive were some AVR XMega128 dev boards I recently acquired from ALVIDI.

The ones I picked up were the AL-XAVRB V2.0

These are nice boards at a very reasonable price – approx $45. Looking forward to see how I can integrate these into some of my co-processor based designs.

128K Flash, 8K SRAM, 2K EPROM, MicroSD socket and 16 or 32MB SDRAM

Still working on my follow up posts about RAM, STORAGE and NETWORK

Tik Tok, another year rolls by the clock …

I still get notifications from A2central, which I always read even though I was pretty much trying to tune everything else “Apple II related” out (except for shipping Uthernet’s in the pipeline).

If I may digress for a moment … for me it’s kind of like quitting smoking … very hard to go cold turkey but doable … then if you sucum to temptation and think I’ll just have just one or two … boom … your sucked right back into the vortex … (I still am cigarette free after 29 years but okay I’ll admit i have the odd Colt once in a awhile with a beer).¬† I don’t think i’ll ever quite be, 100% over,¬† I’d like to have a smoke feeling .

So now your wondering what’s this got to do with Apple II’s? Read on¬† …

On January 28th 2011, Sean posted a pointer to Robert Justice’s Apple IIc Smartport device posting on CSA2 … that was the thing that pulled me back into the vortex from my self induced “no Apple II tinkering” coma. If you’ve been reading my blog all along or read through my forums you know this a project I wanted to do. I had acquired a Chinook Ct-20c to reverse engineer it but got side tracked onto other projects. I am glad Robert finally figured it out. Way to go Robert!!

Re-creating Roberts project with my XGS AVR 8 development system using a MicroSD card was very straight forward. In fact getting the ascii terminal for debugging output gave me the most grief. Reading worked right way but I had to step the SPI clock down quite a bit in order for the write function to work properly. As it stand now, it works well in a IIc (no pass through support yet) and in a IIc+ works fine for the most part but still has an issue with the internal drive where it cannot be used after the external dirve has been initialized.¬† Haven’t been able to puzzle that one out yet.

:) So now it’s nice to be back if only part time ..

I spent the last few days reacquainting myself with some of the projects I was working on and look forward to actually completing some of this stuff.  I plan on resurrecting the IIcxmp project If anyone out there is still reading this blog and if you have any skills to help me debug this Apple IIc+ bus problem I would love to hear from you.

The IIcmxp is meant to be an internal option that centers around a memory upgrade, mass storage and networking. I had a 1MB SRAM based memory replacement in beta mode, working well in a IIc but still with bus issues in a IIc+. I had a SPI/SDcard interface (based on Daryl Rictors SPI code) in alpha mode reading SDCards. I had also purchased zero G wifi modules but not got the module hooked up or code ported from PIC/AVR land to 6502.

To get my feet wet again I plan step back and get the sub-components working in a regular Apple IIe/IIgs first before i reintegrate them for the IIcmxp.

That’s the basic plan .. I will follow up with three more posts, one for each section, where I see my journey going and what I will be looking at to get from point A to point B for each component.

So if your still following along … stay tuned …

Almost a year and no updates :(

Well most everything has¬†been on hold but not forgotten. Other things have had to come first. So any Apple II tinkering has primarily been on the “thought” end vs the soldering iron.

I am still putting out batchs of Uthernets when I can.

I have recently joined the GSport initiative and plan to merge some Applewin changes I was working on last year back in.

Thats about it for now.

I hope your Apple II endeavors are going better then mine.

May 21st Update

Uthernet Status – Invector has informed me that they received the new modules but need some time to test them and mount the connectors. I believe the earliest I would be able to ship out new cards will be the end of June. So there is light at the end of the tunnel :o)

SRAM Status – Last update I mentioned I wanted to “get the existing slinky hardware working rock solid on the //c+ so I have a good foundation in which to try and implement the AUX style memory interface.”¬†¬†¬†¬†¬† I have still not figured this one out and it’s got me stumped, so that’s putting damper on //cmxp progress. :o(

Apple II Emulators – I have spent some time doing some Applewin and kegswin coding. The Applewin update (in code review) is to enable paged EEPROM support for the possibility of a future ROMable version of IP65. The kegswin update adds Uthernet support in slot3 (alpha binary available).

SPI/SDCard status– I haven’t done much with the //c version of this hardware/software since last time but I am designing a 4 port 65SPI/EEPROM(32K) “development” card for the Apple //e in the meantime. This is the hardware equivalent to the software support I have/will code into Applewin.