QUAD: Difference between revisions
(Created page with "[http://bitchin100.com/wiki/index.php?title=QUAD QUAD on Bitchin100] [https://www.oshpark.com/shared_projects/pStseujD QUAD on OSH Park] QUAD (at least the functionality) is...") |
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==Overview== | |||
[http://bitchin100.com/wiki/index.php?title=QUAD QUAD on Bitchin100] | [http://bitchin100.com/wiki/index.php?title=QUAD QUAD on Bitchin100] | ||
QUAD (at least the functionality) is modeled after the [[PGDesigns|PG Designs]] ram bank boards. | |||
QUAD (at least the functionality) is modeled | |||
They both provide multiple banks main ram, which you can switch between using a special menu program that overlays the built in main rom menu. QUAD's "0quad" is modeled after PG Designs "0menu" | They both provide multiple banks main ram, which you can switch between using a special menu program that overlays the built in main rom menu. QUAD's "0quad" is modeled after PG Designs "0menu" | ||
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QUAD is one size, 4 banks. | QUAD is one size, 4 banks. | ||
PG Designs boards added banks to the built-in. The original built-in 8k-32k remains active and accessible as the main "Bank | PG Designs boards added banks to the built-in. The original built-in 8k-32k remains active and accessible as the main "Bank 1" when the PG Designs board is added. | ||
QUAD displaces the built-in ram. So when you install a QUAD, the built-in ram becomes hidden and inaccessible, and the QUAD itself provides the ram for all 4 available banks. (This could be an advantage. If the built-in ram has bad addresses or bad chips, or if there is only 8, 16, or 24k built-in instead of the full 32k, the QUAD will give you full 32k in bank | QUAD displaces the built-in ram. So when you install a QUAD, the built-in ram becomes hidden and inaccessible, and the QUAD itself provides the ram for all 4 available banks. (This could be an advantage. If the built-in ram has bad addresses or bad chips, or if there is only 8, 16, or 24k built-in instead of the full 32k, the QUAD will give you full 32k in bank 1 as well as 2-4) | ||
PG Designs boards use a button battery right on the ram board to maintain the memory. Quad uses the computer's internal memory battery. There are advantages and disadvantages to both approaches. The PG Designs board can be pulled out of the M100 and put into another, and the memory will still be preserved on it. The QUAD will lose it's memory if you unplug it. However, the button cell on the PG Designs must be replaced periodically. The QUAD has no consumable parts to maintain. | PG Designs boards use a button battery right on the ram board to maintain the memory. Quad uses the computer's internal memory battery. There are advantages and disadvantages to both approaches. The PG Designs board can be pulled out of the M100 and put into another, and the memory will still be preserved on it. The QUAD will lose it's memory if you unplug it. However, the button cell on the PG Designs must be replaced periodically. The QUAD has no consumable parts to maintain. | ||
==Build Your Own== | |||
This is all the parts to build 3 QUADs. | |||
[https://www.oshpark.com/shared_projects/pStseujD Order PCB] | |||
[http://www.digikey.com/short/qcm427 Order Parts] | |||
:NOTE: The DigiKey cart above includes the pins just for reference and completeness. | |||
:I would actually remove the pins from the cart and get them from ebay instead. (Search: "round pins gold 2.54") | |||
:2 40-pin sticks is enough to build all 3 QUADs. Typical example: | |||
:http://www.ebay.com/itm/5pcs-Gold-Round-40pin-Male-single-row-0-1inch-2-54mm-pitch-PCB-Panel-Pin-Header-/253102362072 | |||
:Note also the ebay ones all come from China and will take more than a week to arrive. | |||
==Saved Files== | |||
https://drive.google.com/open?id=1ZGjdFMtF-tlTeWjJtHPHN74D5e0A_8_7 | |||
Latest revision as of 00:32, 25 January 2019
Overview
QUAD (at least the functionality) is modeled after the PG Designs ram bank boards.
They both provide multiple banks main ram, which you can switch between using a special menu program that overlays the built in main rom menu. QUAD's "0quad" is modeled after PG Designs "0menu"
Differences are: PG Designs came in several sizes from a single extra 32k up to 7 additional 32k banks added to the built-in.
QUAD is one size, 4 banks.
PG Designs boards added banks to the built-in. The original built-in 8k-32k remains active and accessible as the main "Bank 1" when the PG Designs board is added.
QUAD displaces the built-in ram. So when you install a QUAD, the built-in ram becomes hidden and inaccessible, and the QUAD itself provides the ram for all 4 available banks. (This could be an advantage. If the built-in ram has bad addresses or bad chips, or if there is only 8, 16, or 24k built-in instead of the full 32k, the QUAD will give you full 32k in bank 1 as well as 2-4)
PG Designs boards use a button battery right on the ram board to maintain the memory. Quad uses the computer's internal memory battery. There are advantages and disadvantages to both approaches. The PG Designs board can be pulled out of the M100 and put into another, and the memory will still be preserved on it. The QUAD will lose it's memory if you unplug it. However, the button cell on the PG Designs must be replaced periodically. The QUAD has no consumable parts to maintain.
Build Your Own
This is all the parts to build 3 QUADs.
- NOTE: The DigiKey cart above includes the pins just for reference and completeness.
- I would actually remove the pins from the cart and get them from ebay instead. (Search: "round pins gold 2.54")
- 2 40-pin sticks is enough to build all 3 QUADs. Typical example:
- http://www.ebay.com/itm/5pcs-Gold-Round-40pin-Male-single-row-0-1inch-2-54mm-pitch-PCB-Panel-Pin-Header-/253102362072
- Note also the ebay ones all come from China and will take more than a week to arrive.
Saved Files
https://drive.google.com/open?id=1ZGjdFMtF-tlTeWjJtHPHN74D5e0A_8_7