Power Macintosh PPC ROM DIMMs

[stynx]

Incomplete List of ROM modules:

type-number	voltage	computer model	chips	special features	reprogrammable
820-0961-A	3.3V	?	4x AM29LV800	unpopulated sop & plcc	yes?
820-0954-01	3.3V	PM G3	2x KM2316205Y	2x 70 pin chips	no
341-0758	5V	PM 9500	8x HM27C4000FP-12		no, OTP?
341-0757	5V	PM 6/7/8100			no
341-0741	5V	PM 6/7/8100			no
341-0833	5V	ANS 500/700			no
820-0672-A		PF63x0		ROM & Cache	no
333-1087		PF62x0		ROM & Cache	no
"Apple ESB ROM"		ANS
"PEX proto ROM"	5V?	Power Express 9700	16x AM28F020	prototype related	yes

ToDo:

• Find more ROMs
• find and add "Gazelle Flasher" utility
• add old Flash-util from an early TNT PCI DDK (MacOS 7.5.2 PCI_DDK_vA5)

Goals:

• get the flashing of old World PPC Mac Rom modules working.
• find a way to create flash ROM modules
• complete the list of the available ROM modules

 

[John Tucker]

Greetings,

It has been a year since this was posted. I was curious if progress has been made with either the Todo or goals.
I have three DIMMs that appear to be the same as IMG_6823.jpg. I have a strong desire to duplicate/copy the contents
of one of the ROMs to one of the others. It would be great to have the ability to create additional copies if writeable
ROM DIMMs can be had. I had hoped that the ROM programmer I have from CayMac would accomplish this but the
ROMs are different.

Any info would be appreciated.

Thanks.

 

[Jockelill]

Me and @dougg3 discussed this topic like 2 years ago (time flies) , the idea was to make an adapter for the ROM SIMM Programmer that also could do the PPC ROMs, but at that time the biggest issue was us sourcing the necessary female slot connector (PPC ROM SIMM connector) for the adapter (yeah, stealing one from an old board could work, but wouldn't be very viable). Then life and other projects has kept us away from the concept .

The other solution would be to just use sockets reflashable chips of appropriate size and flash wil like an X-48.

Software wise I remembered that @dougg had an idea for a solution.

The pin out of the PPC ROMs (Power Surge, G3 is totally differnet and 3.3V) is at least:

Pin		PS
1​		Vcc
2​		GND
3​		Vpp? (this would be used on a programmable module with old EEPROMs)
4​		D0 HL
5​		D1 HL
6​		D2 HL
7​		D3 HL
8​		N/A
9​		Vcc
10​		NC
11​		D4 HL
12​		D5 HL
13​		D6 HL
14​		D7 HL
15​		GND
16​		D8 HL
17​		D9 HL
18​		D10 HL
19​		D11 HL
20​		NC
21​		Vcc
22​		NC
23​		D12 HL
24​		D13 HL
25​		D14 HL
26​		D15 HL
27​		GND
28​		NC
29​		NC
30​		A2
31​		A4
32​		A6
33​		A8
34​		A10
35​		NC
36​		NC
37​		WE (For programmable modules, also may connect to pin 117)
38​		OE A1L (May also connect to pin 118)
39​		NC
40​		NC
41​		Vcc
42​		NC
43​		GND
44​		A12
45​		A14
46​		A16
47​		A18
48​		NC
49​		NC
50​		NC
51​		NC
52​		NC
53​		GND
54​		D0 HH
55​		D1 HH
56​		D2 HH
57​		D3 HH
58​		GND
59​		Vcc
60​		NC
61​		D4 HH
62​		D5 HH
63​		D6 HH
64​		D7 HH
65​		GND
66​		D8 HH
67​		D9 HH
68​		D10 HH
69​		D11 HH
70​		NC
71​		Vcc
72​		NC
73​		D12 HH
74​		D13 HH
75​		D14 HH
76​		D15 HH
77​		GND
78​		NC
79​		NC
80​		Vcc
81​		Vcc
82​		GND
83​		NC (May be Vpp on programmable modules)
84​		D0 LL
85​		D1 LL
86​		D2 LL
87​		D3 LL
88​		NC
89​		Vcc
90​		NC
91​		D4 LL
92​		D5 LL
93​		D6 LL
94​		D7 LL
95​		GND
96​		D8 LL
97​		D9 LL
98​		D10 LL
99​		D11 LL
100​		NC
101​		Vcc
102​		NC
103​		D12 LL
104​		D13 LL
105​		D14 LL
106​		D15 LL
107​		GND
108​		A0
109​		A1
110​		NC
111​		A3
112​		A5
113​		A7
114​		A9
115​		_CE
116​		1Kohm to GND?
117​		WE for back of module on programmable modules, may also connect to 37
118​		_OE all, also connects to 38
119​		NC
120​		NC
121​		Vcc
122​		NC
123​		GND
124​		A11
125​		A13
126​		A15
127​		A17
128​		NC
129​		NC
130​		NC
131​		NC
132​		NC
133​		GND
134​		D0 LH
135​		D1 LH
136​		D2 LH
137​		D3 LH
138​		NC
139​		Vcc
140​		NC
141​		D4 LH
142​		D5 LH
143​		D6 LH
144​		D7 LH
145​		GND
146​		D8 LH
147​		D9 LH
148​		D10 LH
149​		D11 LH
150​		NC
151​		Vcc
152​		NC
153​		D12 LH
154​		D13 LH
155​		D14 LH
156​		D15 LH
157​		GND
158​		NC
159​		NC
160​		Vcc

 

[Performa450]

Here’s another one - AP2216-03 from the Power Mac 4400 prototype. It has 16x AM28F020s

 

[Jockelill]

Interesting that they used AM28F020 for those, it's also the same they used for the LOBOS board:

https://68kmla.org/bb/index.php?threads/lobos-board-strange-apple-rom.39963/

And the STB3 (although in a different form factor):

Apple's Interactive Television Box: hacking the Set Top Box System 7.1 in ROM

This article has been revised with recollections and corrections from former Apple employee Al Kossow, some good folks on Hacker News and t...

oldvcr.blogspot.com

 

[Jockelill]

Pretty sure they had a LC PDS programmer with a DIMM socket and then flashed them using the Flasher tool on a Q605 machine. @dougg3 built an LC programmer (and later I made a proper board for it):

Downtown Doug Brown » More fun with Apple’s internal tools: creating a PDS card

www.downtowndougbrown.com

But are pretty sure the same tool can also reflash PPC ROMs, so that could also be an option. I can reflash both the Red Rom from an STB and LOBOS board inside my LC475 using these tools.