Meeprom: Difference between revisions
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PCB: [https://oshpark.com/ | PCB: [https://oshpark.com/shared_projects/VF7MoDfT OSHPark] or [https://www.pcbway.com/project/shareproject/Meeprom___Writable_option_rom_for_Epson_PX_8__PX_4__TANDY_Model_600.html PCBWAY] | ||
Source: http://github.com/bkw777/Teeprom | Source: http://github.com/bkw777/Teeprom | ||
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:Epson PX-8 | :Epson PX-8 | ||
NOT for TRS-80 Model 100, 102, or 200!<br> | |||
For those, see [[Teeprom]] instead. | |||
PCB ordering notes<br> | |||
Min Track/Spacing: 6/6mil - On PCBWAY the ordering page may come up with 5/5 or even 4/4 pre-selected, rasing the cost a lot, but this board does not actually have any such narrow traces or gaps. Just manually switch it to 6/6<br> | |||
Solder Mask: Any, but some colors result in either higher cost or longer wait time. The "yellow" color is not really yellow. It's more like a clear coat that looks orange-yellow just from the copper.<br> | |||
Surface Finish: ENIG<br> | |||
PCBWAY produces a clean board outline routered all the way around and ready to use out of the box.<br> | |||
OSHPark boards have panelization attachment points that you will still need to sand down and clean up.<br> | |||
The default DHL shipping from PCBWAY will deliver your boards in a few days, about a week total from order to doorstep. The cheaper options will take several weeks.<br> | |||
OSHPark boards are all ENIG by default rather than an extra charge, however the base service costs more so in the end it's not that different. | |||
Revision as of 17:42, 25 December 2022
Meeprom (Molex EEPROM) is a version of Teeprom with a standard 27C256 pinout instead of the non-standard Tandy 100/102/200 pinout.
Source: http://github.com/bkw777/Teeprom
This is useful in at least the following machines:
- Tandy model 600
- Kyotronic KC-85
- Epson PX-4
- Epson PX-8
NOT for TRS-80 Model 100, 102, or 200!
For those, see Teeprom instead.
PCB ordering notes
Min Track/Spacing: 6/6mil - On PCBWAY the ordering page may come up with 5/5 or even 4/4 pre-selected, rasing the cost a lot, but this board does not actually have any such narrow traces or gaps. Just manually switch it to 6/6
Solder Mask: Any, but some colors result in either higher cost or longer wait time. The "yellow" color is not really yellow. It's more like a clear coat that looks orange-yellow just from the copper.
Surface Finish: ENIG
PCBWAY produces a clean board outline routered all the way around and ready to use out of the box.
OSHPark boards have panelization attachment points that you will still need to sand down and clean up.
The default DHL shipping from PCBWAY will deliver your boards in a few days, about a week total from order to doorstep. The cheaper options will take several weeks.
OSHPark boards are all ENIG by default rather than an extra charge, however the base service costs more so in the end it's not that different.