128kB RAM for Apple II ][ II+ ][+ -- Saturn 128 compatibleDesigned by Garrett's Workshop in United States of America
The RAM128 (GW4208B) RAM expansion card provides the Apple II, II+, and IIe with 128 kB of Language Card and Saturn-compatible expansion memory. Low-Power, SRAM-Based Design Thanks to a modern, low-…Read More…
The RAM128 (GW4208B) RAM expansion card provides the Apple II, II+, and IIe with 128 kB of Language Card and Saturn-compatible expansion memory.
Thanks to a modern, low-power design, RAM128 uses a maximum of 0.01 watts when idle (2 mA @ 5V) and 0.1W in active use (20 mA @ 5V). Unlike other Apple II expansion RAM cards, which are built with vintage asynchronous DRAM chips, RAM128 uses modern SRAM. This design allows for low power consumption and improved reliability over other memory cards using 15+ year old chips.
RAM128 is built with a lead-free, 4-layer, ENIG gold-plated PCB and is fully EU RoHS-compliant. All units are tested extensively before shipment, and only new parts are used to build RAM128.
RAM128’s design is fully open-source. The schematics and board layouts are all freely available for commercial and noncommercial use. To download the design files, visit the Garrett's Workshop GitHub page: https://github.com/garrettsworkshop
RAM128 is compatible with Apple II, II+, and, with some limitations, is compatible with Apple IIe and IIgs. In the Apple II and II+, RAM128 is best used in Slot 0, the slot in which most applications expect to find Saturn or Language Card-type memory. RAM128 is compatible with Apple IIe and IIgs with some limitations. Most applications for these machines do not utilize Saturn-type memory cards like the RAM128, and instead work with the RAM expansion slots native to these machines—auxiliary RAMWorks-type memory on the IIe, and expansion memory on the Apple IIgs. Nevertheless, RAM128 is somewhat compatible with the Apple IIe and Apple IIgs. The Apple IIe has no Slot 0, and instead has built-in language card memory. Therefore, RAM128 must be installed into Slot 1-7. In this configuration, RAM128 is technically compatible with the Apple IIe. However, many applications written for the Apple II and II+ which utilize Saturn-type memory are hard-coded to only look for Saturn memory in Slot 0. These applications will not be able to utilize the RAM128. On the Apple IIgs, in addition to the caveats applicable to the Apple IIe, RAM128 is only usable in 1 MHz “slow” mode. With the IIgs set to 2.8 MHz “fast” mode or with an accelerator, the Apple IIgs will not be able to utilize the RAM128’s memory.
The “B” revision of the RAM128 card (model number GW4208B) supports the so-called “ROM-sharing” protocol. This allows the RAM128 to coexist with an always-enabled ROM card such as the MultiROM. By default, the ROM-sharing protocol is enabled, but this may cause issues with DMA-capable peripheral cards. In general, an empty slot should be left between the RAM128 and any DMA-capable peripheral card, otherwise the ROM-sharing protocol should be disabled. To disable the ROM-sharing functionality, the two DIP switches on the card should be set to the lower position (further away from the “ON” text). With both switches in the upper position, the ROM-sharing functionality is enabled.
No country selected, please select your country to see shipping options.
No rates are available for shipping to .
Enter your email address if you'd like to be notified when RAM128 (GW4208B) -- 128kB RAM for Apple II can be shipped to you:
Thanks! We'll let you know when the seller adds shipping rates for your country.
|Shipping Rate||Tracked||Ships From||First Item||Additional Items|
Charles | Aug. 23, 2022
Mark | Oct. 18, 2021
Kay | Feb. 4, 2021
We recognize our top users by making them a Tindarian. Tindarians have access to secret & unreleased features.
We look for the most active & best members of the Tindie community, and invite them to join. There isn't a selection process or form to fill out. The only way to become a Tindarian is by being a nice & active member of the Tindie community!