ROM programming - Revision history

Geekdot at 12:52, 26 March 2026

2026-03-26T12:52:36Z

@@ Line 40: / Line 40: @@
 The PLCC package was intentionally chosen because this allows removing the ROM chips and external programming by using an EPROM burner/programmer/"blower".
-That said, the PLCC sockets are not made lots of insertions and removals and '''will wear out pretty quickly'''.<br>
+That said, the PLCC sockets are not made for lots of insertions and removals and '''will wear out pretty quickly'''.<br>
 ''So try to keep the number of in's and out's as low as possible!''
 === Programming the ROMs ===

Geekdot at 12:44, 26 March 2026

2026-03-26T12:44:36Z

← Older revision		Revision as of 14:44, 26 March 2026
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	Depending on your board revision there are diffrent ways to disable the onboard TOS ROM.		Depending on your board revision there are diffrent ways to disable the onboard TOS ROM.

	~~Owners of a '''revision~~ 1.1b~~''' (~~and later) card can simply pull the jumper marked with “ROM enable” on the card.		==== Revision 1.1b and later ====

			Owners of the most recent card revisions can simply pull the jumper marked with “ROM enable” on the card.

			==== Revision 1.1a ====

	Owners of ATW800/2 with a '''revision of 1.1a''' can also use this red jumper but also need to do a tiny little bit of soldering.		Owners of ATW800/2 with a '''revision of 1.1a''' can also use this red jumper but also need to do a tiny little bit of soldering.
Line 29:		Line 33:
	[[File:Mk3_v1.1a_ROM_jumper_patch.jpg\|none]]		[[File:Mk3_v1.1a_ROM_jumper_patch.jpg\|none]]

	Owners card '''~~revisions before 1.1a~~''' ~~need to remove~~ the ROM chips from their sockets.		==== Revisions previous to 1.1a ====
			Owners of the early card revisions need to '''physically remove''' the ROM chips from their sockets.

	You can do this by using either a dedicated PLCC pulling tool (shown below on the left) or a thin but sturdy tool and carefully sticking it into the notches in the corners of the socket one side at a time. Gently remove the ROM chip by lifting it up a little on each side. After a couple of lifts, it will pop out.		You can do this by using either a dedicated PLCC pulling tool (shown below on the left) or a thin but sturdy tool and carefully sticking it into the notches in the corners of the socket one side at a time. Gently remove the ROM chip by lifting it up a little on each side. After a couple of lifts, it will pop out.
	[[File:Screenshot 2026-03-26 133224.png\|center]]		[[File:Screenshot 2026-03-26 133224.png\|center]]

			The PLCC package was intentionally chosen because this allows removing the ROM chips and external programming by using an EPROM burner/programmer/"blower".
			That said, the PLCC sockets are not made lots of insertions and removals and '''will wear out pretty quickly'''.<br>
			''So try to keep the number of in's and out's as low as possible!''

			=== Programming the ROMs ===

Geekdot at 12:35, 26 March 2026

2026-03-26T12:35:10Z

← Older revision		Revision as of 14:35, 26 March 2026
Line 25:		Line 25:
	Owners of ATW800/2 with a '''revision of 1.1a''' can also use this red jumper but also need to do a tiny little bit of soldering.		Owners of ATW800/2 with a '''revision of 1.1a''' can also use this red jumper but also need to do a tiny little bit of soldering.
	Due to a design mistake, the left pin of the jumper needs a connection to a 5V source.		Due to a design mistake, the left pin of the jumper needs a connection to a 5V source.
	This is for example available at the 3rd pin from right of TRAM socket “SLOT 2” using a jumper wire.		This is for example available at the 3rd pin from right of TRAM socket “SLOT 2” using a jumper wire on the backside of the card.

			[[File:Mk3_v1.1a_ROM_jumper_patch.jpg\|none]]

	Owners ~~of previous~~ card revisions need to remove the ROM chips from their sockets.		Owners card '''revisions before 1.1a''' need to remove the ROM chips from their sockets.

	You can do this by using either a dedicated PLCC pulling tool (shown below left) or a thin but sturdy tool and carefully sticking it into the notches in the corners of the socket one side at a time. Gently remove the ROM chip by lifting it up a little on each side. After a couple of lifts, it will pop out.		You can do this by using either a dedicated PLCC pulling tool (shown below on the left) or a thin but sturdy tool and carefully sticking it into the notches in the corners of the socket one side at a time. Gently remove the ROM chip by lifting it up a little on each side. After a couple of lifts, it will pop out.
			[[File:Screenshot 2026-03-26 133224.png\|center]]

Geekdot: Created page with "Category:ATW800/2 The ATW800/2 for the '''Mega ST bus''' features two flash ROMs that provide space for four 256 KB TOS images. The DIP switch at the back of the card can select these ROMs. Looking at the DIP switch from the back of the card, the switches read 1 and 2 from left to right: {| class="wikitable" |+ Default programming |- ! Slot # !! Sw1 !! Sw2 !! Default ROM |- | 1|| Down || Down || TOS 2.06 |- | 2|| Up|| Down || Latest EMU TOS |- | 3|| Down || Up|| Pre..."

2026-03-26T12:24:58Z

Created page with "Category:ATW800/2 The ATW800/2 for the '''Mega ST bus''' features two flash ROMs that provide space for four 256 KB TOS images. The DIP switch at the back of the card can select these ROMs. Looking at the DIP switch from the back of the card, the switches read 1 and 2 from left to right: {| class="wikitable" |+ Default programming |- ! Slot # !! Sw1 !! Sw2 !! Default ROM |- | 1|| Down || Down || TOS 2.06 |- | 2|| Up|| Down || Latest EMU TOS |- | 3|| Down || Up|| Pre..."

New page

[[Category:ATW800/2]]
The ATW800/2 for the '''Mega ST bus''' features two flash ROMs that provide space for four 256 KB TOS images.

The DIP switch at the back of the card can select these ROMs.
Looking at the DIP switch from the back of the card, the switches read 1 and 2 from left to right:
{| class="wikitable"
|+ Default programming
|-
! Slot # !! Sw1 !! Sw2 !! Default ROM
|-
| 1|| Down || Down || TOS 2.06
|-
| 2|| Up|| Down || Latest EMU TOS
|-
| 3|| Down || Up|| Previous EMU TOS version
|-
| 4|| Up|| Up|| TOS 1.04
|}

=== Disabling the ROMs ===
Depending on your board revision there are diffrent ways to disable the onboard TOS ROM.

Owners of a '''revision 1.1b''' (and later) card can simply pull the jumper marked with “ROM enable” on the card.

Owners of ATW800/2 with a '''revision of 1.1a''' can also use this red jumper but also need to do a tiny little bit of soldering.
Due to a design mistake, the left pin of the jumper needs a connection to a 5V source.
This is for example available at the 3rd pin from right of TRAM socket “SLOT 2” using a jumper wire.

Owners of previous card revisions need to remove the ROM chips from their sockets.

You can do this by using either a dedicated PLCC pulling tool (shown below left) or a thin but sturdy tool and carefully sticking it into the notches in the corners of the socket one side at a time. Gently remove the ROM chip by lifting it up a little on each side. After a couple of lifts, it will pop out.