Meeprom - Revision history

Bkw: /* 4ROM */

2024-07-13T15:37:09Z

4ROM

← Older revision		Revision as of 15:37, 13 July 2024
Line 37:		Line 37:
	JLCPCB is essentially the same as PCBWAY, except they don't have sharable project/buy pages like OSHPark or PCBWAY. You have to upload a gerber zip.		JLCPCB is essentially the same as PCBWAY, except they don't have sharable project/buy pages like OSHPark or PCBWAY. You have to upload a gerber zip.

	== ~~4ROM~~ ==		== M4ROM ==
	...aka Teeprom & Meeprom 2.0 aka the overkilling		...aka Teeprom & Meeprom 2.0 aka the overkilling

	~~The 4ROM_78802 version of this holds~~ 4 rom images and ~~works with the 600~~.		Holds 4 rom images. Re-programmable with a programming adapter which you have to build, but actually costs less and is more convenient to use than a soic-28 test clip and wires.

	https://github.com/bkw777/~~Teeprom/blob/master/4ROM.md~~		There is both a TANDY-compatible version for Model 100/102/200, and a 27256-compatible version for everything else including TANDY Model 600 and Epson PX-8 etc.

			https://github.com/bkw777/M4ROM

	<gallery>		<gallery>

Bkw: /* 4ROM */

2023-02-21T14:04:26Z

4ROM

← Older revision		Revision as of 14:04, 21 February 2023
Line 51:		Line 51:
	4ROM_06.jpg		4ROM_06.jpg
	4ROM_07.jpg		4ROM_07.jpg
			4ROM_04.jpg
	4ROM_08.jpg		4ROM_08.jpg
	</gallery>		</gallery>

Bkw: /* 4ROM */

2023-02-21T13:59:05Z

4ROM

← Older revision		Revision as of 13:59, 21 February 2023
Line 48:		Line 48:
	4ROM_02.jpg		4ROM_02.jpg
	4ROM_03.jpg		4ROM_03.jpg
	~~4ROM_04.jpg~~
	4ROM_05.jpg		4ROM_05.jpg
	4ROM_06.jpg		4ROM_06.jpg

Bkw at 13:48, 21 February 2023

2023-02-21T13:48:07Z

← Older revision		Revision as of 13:48, 21 February 2023
Line 43:		Line 43:

	https://github.com/bkw777/Teeprom/blob/master/4ROM.md		https://github.com/bkw777/Teeprom/blob/master/4ROM.md

			<gallery>
			4ROM_01.jpg
			4ROM_02.jpg
			4ROM_03.jpg
			4ROM_04.jpg
			4ROM_05.jpg
			4ROM_06.jpg
			4ROM_07.jpg
			4ROM_08.jpg
			</gallery>

Bkw: /* 4ROM */

2023-02-21T13:45:44Z

4ROM

← Older revision		Revision as of 13:45, 21 February 2023
Line 39:		Line 39:
	== 4ROM ==		== 4ROM ==
	...aka Teeprom & Meeprom 2.0 aka the overkilling		...aka Teeprom & Meeprom 2.0 aka the overkilling

	The ~~standard pinout~~ version of this ~~(Like Meeprom, not for Model 100/200) is tested~~ and ~~working~~.~~<br>~~		The 4ROM_78802 version of this holds 4 rom images and works with the 600.
	~~The Tandy 100/200 version (Like Teeprom) still needs to be tested.<br>~~
	https://github.com/bkw777/Teeprom/blob/master/4ROM.md		https://github.com/bkw777/Teeprom/blob/master/4ROM.md

Bkw at 11:18, 13 February 2023

2023-02-13T11:18:23Z

← Older revision		Revision as of 11:18, 13 February 2023
Line 36:		Line 36:
	OSHPark boards are all always ENIG, not an extra charge, however the base service costs more, so in the end it's not that different.<br>		OSHPark boards are all always ENIG, not an extra charge, however the base service costs more, so in the end it's not that different.<br>
	JLCPCB is essentially the same as PCBWAY, except they don't have sharable project/buy pages like OSHPark or PCBWAY. You have to upload a gerber zip.		JLCPCB is essentially the same as PCBWAY, except they don't have sharable project/buy pages like OSHPark or PCBWAY. You have to upload a gerber zip.

			== 4ROM ==
			...aka Teeprom & Meeprom 2.0 aka the overkilling

			The standard pinout version of this (Like Meeprom, not for Model 100/200) is tested and working.<br>
			The Tandy 100/200 version (Like Teeprom) still needs to be tested.<br>
			https://github.com/bkw777/Teeprom/blob/master/4ROM.md

Bkw at 16:40, 12 January 2023

2023-01-12T16:40:44Z

← Older revision		Revision as of 16:40, 12 January 2023
Line 9:		Line 9:

	This is useful in at least the following machines:		This is useful in at least the following machines:
	:~~Tandy model~~ 600		:TANDY Model 600
	:Kyotronic KC-85		:Kyotronic KC-85 (The only "Model T" with the Molex socket but a standard pinout!)
	:Epson PX-4		:Epson PX-4
	:Epson PX-8		:Epson PX-8

Bkw: /* PCB ordering notes */

2023-01-12T16:37:43Z

PCB ordering notes

← Older revision		Revision as of 16:37, 12 January 2023
Line 26:		Line 26:
	Not strictly necessary, and it raises the cost, but you want the castellated edge contacts to be gold plated.		Not strictly necessary, and it raises the cost, but you want the castellated edge contacts to be gold plated.

			'''Advanced options: Castellated Half Holes'''<br>
	Under advanced options there is a checkbox for castellated half holes. It raises the cost, and you don't really need this if you're willing to clean up any router mess yourself. But when placing the order the order will be reviewed by an employee and most of the time the reviewer will see the castellated edges and say it requires the option, or they may just add the option themselves and the. You may be able to argue with them by email to keep the option off, but probably it's not worth the fight.		Under advanced options there is a checkbox for castellated half holes. It raises the cost, and you don't really need this if you're willing to clean up any router mess yourself. But when placing the order the order will be reviewed by an employee and most of the time the reviewer will see the castellated edges and say it requires the option, or they may just add the option themselves and the. You may be able to argue with them by email to keep the option off, but probably it's not worth the fight.

	OSHPark vs PCBWAY or JLCPCB		OSHPark vs PCBWAY or JLCPCB<br>
	PCBWAY or JLCPCB produces a clean board outline routered all the way around and ready to use out of the box.<br>		PCBWAY or JLCPCB 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>		OSHPark boards have panelization attachment points that you will still need to sand down and clean up.<br>

Bkw at 16:36, 12 January 2023

2023-01-12T16:36:33Z

← Older revision		Revision as of 16:36, 12 January 2023
Line 17:		Line 17:
	For those, see [[Teeprom]] instead.		For those, see [[Teeprom]] instead.

	PCB ordering notes~~<br>~~		==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<br>~~		On PCBWAY or JLCPCB there are several settings and options. Most you should leave as default, but there are a few settings to pay attention to.
	~~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>		'''Min Track/Spacing: 6/6mil'''<br>
			On PCBWAY the ordering page may come up with 5/5 or even 4/4 pre-selected, raising the cost unnecessarily. This board does not actually have any such narrow traces or gaps. All traces and gaps are 0.2mm minumum, which is almost 8mil, so 6/6 is the correct setting. Just manually select 6/6.<br>

			'''Surface Finish: ENIG'''<br>
			Not strictly necessary, and it raises the cost, but you want the castellated edge contacts to be gold plated.

			Under advanced options there is a checkbox for castellated half holes. It raises the cost, and you don't really need this if you're willing to clean up any router mess yourself. But when placing the order the order will be reviewed by an employee and most of the time the reviewer will see the castellated edges and say it requires the option, or they may just add the option themselves and the. You may be able to argue with them by email to keep the option off, but probably it's not worth the fight.

			OSHPark vs PCBWAY or JLCPCB
			PCBWAY or JLCPCB 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>		OSHPark boards have panelization attachment points that you will still need to sand down and clean up.<br>
			The flip side of the fact the OSHPark doesn't do any extra work to clean up the edges is there is also no extra charge for castellated edges.<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>		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.		OSHPark boards are all always ENIG, not an extra charge, however the base service costs more, so in the end it's not that different.<br>
			JLCPCB is essentially the same as PCBWAY, except they don't have sharable project/buy pages like OSHPark or PCBWAY. You have to upload a gerber zip.

Bkw at 17:42, 25 December 2022

2022-12-25T17:42:43Z

← Older revision		Revision as of 17:42, 25 December 2022
Line 4:		Line 4:
	</gallery>		</gallery>

	PCB: [https://oshpark.com/~~projects~~/VF7MoDfT~~/view_design~~ OSHPark] or [https://www.pcbway.com/project/shareproject/Meeprom___Writable_option_rom_for_Epson_PX_8__PX_4__TANDY_Model_600.html PCBWAY]		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
Line 14:		Line 14:
	:Epson PX-8		:Epson PX-8

	~~This is the same as~~ [[Teeprom]], ~~except with~~ a ~~standard 27C256 pinout instead of Teeprom~~'s ~~special TRS~~-~~80 Model 100 pinout~~. ~~See [[Teeprom]] for~~ more ~~info~~.		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.